java assignment w3resource

Top 10 Sites for Java Coding Practice

Ready to level up your Java programming skills? Join us for some exciting Java coding practice online . If you want to boost your Java code proficiency then dive into engaging Java practice programs and witness remarkable progress.

What is Java Programming?

Java, an immensely versatile and widely employed programming language, stands out as a paramount choice among developers. With its high-level object-oriented structure, Java coding practice empowers programmers to craft code that can be executed across diverse platforms. Its enduring popularity spans over two decades, boasting a staggering user base of millions.

Why Should You Learn Java?

Most of us do agree that it’s worth it to learn to code but the question is why specifically Java? However, you may wonder, why should one specifically choose Java. Java, as a versatile programming language , holds a prominent position in the developer community . Whether your interests lie in crafting desktop software, building mobile apps , creating web applications, or developing enterprise-level systems, Java caters to all these domains.

It finds extensive utilization across both commercial and professional applications. Java programming, known for its speed, reliability, and robust security measures, lends itself to a wide range of applications, from mobile apps to big data solutions. So by Java coding practice you can improve your skills and get a stable future.

Popularity Of Top 10 Programming Languages

Now let’s discuss some of the popular application languages with their ranks as well:

Practicing Java With Top 10 Websites

One of the key strengths of doing Java coding practice is its “write once, run anywhere” principle, achieved through the Java Virtual Machine (JVM). Let’s discuss some of the top Java online practice websites that will help you explore Java.

Java For Beginners

If you have little to no experience then the best website for practicing Java is Java For Beginners. A typical “Java for beginners” course provides comprehensive coverage of fundamental concepts and syntax used in the Java programming language. For Java coding practice this is one of the best options.

This practice Java online course introduces learners to essential topics, including variables, principles of object-oriented programming and much more. The course is a user friendly sequence of tutorials that helps beginners master the essentials of Java code practice . Additionally, it may delve into areas like input/output operations, exception handling, and basic software development concepts.

What can go wrong with code.org? It’s a non profit organization whose main aim is to help children learn computer programming. Code.org offers a wide range of resources for various programming languages, including Python, JavaScript, and more. The website has about 60 million users which speaks to the quality of this site.

Java Code Geeks

If you want to learn from free and downloadable Java programs for practice then the Java Code Geeks is the best option for you. Java Code Geeks functions as a virtual platform that offers an extensive array of invaluable resources. This extraordinary website serves as a platform for downloading ebooks or documents such as JPA Mini Book, JVM Troubleshooting Guide,

Java Rockstar, JUnit Tutorial, and many others. It’s easy to learn about different variants of Java coding practice under this platform. The platform also features a Q&A section where developers can ask questions and receive assistance from the community.

Udemy

If you are a beginner and want to master Java coding practice then Udemy is the best Java practice online course for you. The courses on Udemy consist of video lectures, downloadable resources, quizzes, assignments, and discussion forums. They are designed to be self-paced, allowing learners to study at their convenience and learn at their own speed. Along with Java you can also learn different programming languages like Java, C++, and C with the help of Udemy.

One of the Java best practices is Codecademy. The platform is a mix of free and paid content that helps beginners learn to code in Java. Users can upgrade to gain exclusive access to a wealth of additional features and captivating content that will take coding practices to new heights.

Users can get hands-on Java coding exercises , mind-stimulating quizzes, and exciting projects meticulously designed to develop good coding practices . The platform also offers opportunities to work and then implement your knowledge on different projects.

The foundation of edX was laid by Harvard and MIT in May 2012. It is one of the worldwide emerging platforms that offers a vast range of high quality resources and best Java programming practice programs. edX provides a diverse selection of courses in various subjects, including computer science, data science, business, social sciences, and more.

It is an American Massive Open Online Courses (MOOC) provider that hosts university level courses in many disciplines. Also, edx provides weekly learning sequences and most of the courses are free so the students don’t have to pay and gain as much knowledge as they need.

Tutorials Point

Another useful website for beginners, as well as experienced developers for Java best practices, is Tutorials Point. If a beginner wants to learn core or advanced Java steps then a tutorials point is a good option. The main purpose of this website is to provide quality applications for learners that will help them improve their skills in coding Java and other languages.

Tutorial point platform also allows you to study different examples and execute them to understand your skills. You can get the most updated material on both technical and non technical subjects on this platform.

Program Creek

If you want to learn Java coding practice and other languages as well then program creek is a well designed tutorial design where you can learn. It serves as a valuable resource for programmers, software developers , and technology enthusiasts. The platform explains good-quality content for understanding Java coding standards that will help you improve your coding skills.

Program Creek provides tutorials and guides on topics such as Java, Python, JavaScript, SQL, and more. It also features a search functionality that allows users to find specific code examples or tutorials related to their programming needs.

Cave Of Programming

Cave Of Programming is an online platform that was developed by John Purcell. The platform provides free Java code practice courses. The platform provides a wide range of content to accommodate learners with varying levels of expertise, offering both introductory materials and advanced topics.

Cave of Programming’s tutorials are meticulously crafted to ensure accessibility and comprehensiveness. Each tutorial goes beyond theory by incorporating practical examples, code demonstrations, and interactive exercises, all of which contribute to a holistic learning experience.

W3resource is an online platform that provides a wide range of Java coding practice resources, tutorials, and exercises for learning web development and Java practice projects . It offers a comprehensive collection of educational materials, including tutorials, examples, code snippets, quizzes, and challenges, to help individuals enhance their skills.

W3resource offers the best exercises to implement the concepts. The main focus of W3resource is on Java exercises . W3resource’s content is free to access for best coding practices , making it accessible to a wide range of students.

Advantages Of Java Coding Practice

The key advantages of Java Coding Practice are as follows:

Platform Independence
Object-Oriented Approach
Robustness and Reliability
Rich Standard Library
Community and Ecosystem
Scalability and Performance

Conclusion

To conclude, adhering to Java coding practice in Java is crucial for developing high-quality, maintainable, and efficient software. By following these practices, developers can enhance code readability, improve code organization, and minimize potential bugs and errors. If you want to excel in Java the only way is to code a lot. Also, practicing code optimization and performance tuning is crucial for Java developers.

Consistent indentation, meaningful variable and method names, and appropriate comments can greatly improve code readability. These practices help developers to enhance the robustness of their applications and ensure better user experiences.

Q No.1 How can I practice coding in Java?

Answer: Here are some steps to help you get started:

Set Up Your Environment
Choose a Code Editor
Learn Java Fundamentals
Practice with Simple Exercises
Online Coding Platforms
Work on Projects
Review Open-Source Projects
Participate in Java Communities
Read Books and Tutorials
Stay Consistent

Q No.2 How can I practice Java code in Mobile?

Answer: Practicing Java code on a mobile device is possible through various apps and platforms. Here are some ways to practice Java code on your mobile:

Mobile Code Editors
Integrated Development Environments (IDEs)
Java Learning Apps
Virtual Machines
Educational Websites
Pair Programming

Q No.3 How hard is Java code?

Answer: The difficulty level of Java code can vary depending on various factors, including prior programming experience, the complexity of the task, and familiarity with the language concepts.

Q No.4 Can I learn Java in 1 month?

Answer: Yes, it is possible to learn the basics of Java programming in one month. However, keep in mind that becoming proficient in Java or any programming language requires continuous practice.

Q No.5 Is Java or Python harder?

Answer: Java and Python stand as two of the most widely used programming languages. Among them, Java is recognized for its faster performance, while Python is simple and easy to learn.

Q No.6 Which app is used for coding in Java?

Answer: Here are some popular options for coding in Java:

Desktop IDEs for Java Coding:

IntelliJ IDEA

Mobile Apps for Java Coding:

AIDE – Android IDE
Dcoder, Compiler IDE

Q No.7 Which companies use Java?

Answer: Some of the well-known companies that use Java in their technology stack include Google, Amazon, Microsoft, Netflix, Twitter, Facebook, Uber, LinkedIn, IBM, Oracle, Adobe, Intel, and Accenture.

Q No.8 Is Netflix using Java?

Answer: Yes, Java is one of the core programming languages utilized by Netflix for building various components of its streaming service and backend infrastructure.

Q No.9 What is Java best used for?

Answer: Some of the primary use cases where Java excels include Web Development, Android App Development, Enterprise Applications, Backend Development, Big Data Processing, Internet of Things (IoT), Scientific and Research Applications, Game Development, Cloud Services, Embedded Systems.

Q No.10 Where do I start Java?

Answer: Start learning Java by installing the JDK and using a code editor or IDE to practice basic concepts like variables, control structures, and functions.

Q No.11 Is coding enough to get a job?

Answer: Knowing how to code is a valuable and in-demand skill that can lead to success in various job roles, both within and outside the technology industry.

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Java Arrays
Java Strings
Java Collection
Java 8 Tutorial
Java Multithreading
Java Exception Handling
Java Programs
Java Project
Java Collections Interview
Java Interview Questions
Spring Boot
Java Programs - Java Programming Examples

Java Basic Programs

How to Read and Print an Integer value in Java
Ways to read input from console in Java
Java Program to Multiply two Floating-Point Numbers
Java Program to Swap Two Numbers
Java Program to Add Two Binary Strings
Java Program to Add two Complex Numbers
Java Program to Check if a Given Integer is Odd or Even
Java Program to Find the Largest of three Numbers
Java Program to Find LCM of Two Numbers
Java Program to Find GCD or HCF of Two Numbers
Java Program to Display All Prime Numbers from 1 to N
Java Program to Find if a Given Year is a Leap Year
Java Program to Check Armstrong Number between Two Integers
Java Program to Check If a Number is Neon Number or Not
Java Program to Check Whether the Character is Vowel or Consonant
Java Program for factorial of a number
Java Program to Find Sum of Fibonacci Series Numbers of First N Even Indexes
Java Program to Calculate Simple Interest
Java Program for compound interest
Java Program to Find the Perimeter of a Rectangle

Java Pattern Programs

Java Program to Print Right Triangle Star Pattern
Java Program to Print Left Triangle Star Pattern
Java Program to Print Pyramid Number Pattern
Java Program to Print Reverse Pyramid Star Pattern
Java Program to Print Upper Star Triangle Pattern
Java Program to Print Mirror Upper Star Triangle Pattern
Java Program to Print Downward Triangle Star Pattern
Java Program to Print Mirror Lower Star Triangle Pattern
Java Program to Print Star Pascal’s Triangle
Java Program to Print Diamond Shape Star Pattern
Java Program to Print Square Star Pattern
Java Program to Print Pyramid Star Pattern
Java Program to Print Spiral Pattern of Numbers

Java Conversion Programs

Java Program to Convert Binary to Octal
Java Program to Convert Octal to Decimal
Java Program For Decimal to Octal Conversion
Java Program For Hexadecimal to Decimal Conversion
Java Program For Decimal to Hexadecimal Conversion
Java Program for Decimal to Binary Conversion
Boolean toString() method in Java with examples
Convert String to Double in Java
Java Program to Convert Double to String
Java Program to Convert String to Long
Java Program to Convert Long to String
Java Program For Int to Char Conversion
Java Program to Convert Char to Int

Java Classes and Object Programs

Classes and Objects in Java
Abstract Class in Java
Singleton Method Design Pattern in Java
Interfaces in Java
Encapsulation in Java
Inheritance in Java
Abstraction in Java
Difference Between Data Hiding and Abstraction in Java
Polymorphism in Java
Method Overloading in Java
Overriding in Java
Super Keyword in Java
'this' reference in Java
static Keyword in Java
Access Modifiers in Java

Java Methods Programs

Java main() Method - public static void main(String[] args)
Difference between static and non-static method in Java
HashTable forEach() method in Java with Examples
StringBuilder toString() method in Java with Examples
StringBuffer codePointAt() method in Java with Examples
How compare() method works in Java
Short equals() method in Java with Examples
Difference Between next() and hasNext() Method in Java Collections
What does start() function do in multithreading in Java?
Difference between Thread.start() and Thread.run() in Java

Java Searching Programs

Java Program for Linear Search
Binary Search in Java
Java Program To Recursively Linearly Search An Element In An Array

Java 1-D Array Programs

Check if a value is present in an Array in Java
Java Program to find largest element in an array
Arrays.sort() in Java with examples
Java Program to Sort the Array Elements in Descending Order
Java Program to Sort the Elements of an Array in Ascending Order
Remove duplicates from Sorted Array
Java Program to Merge Two Arrays
Java Program to Check if two Arrays are Equal or not
Remove all occurrences of an element from Array in Java
Java Program to Find Common Elements Between Two Arrays
Array Copy in Java
Java Program For Array Rotation

Java 2-D Arrays (Matrix) Programs

Print a 2 D Array or Matrix in Java
Java Program to Add two Matrices
Sorting a 2D Array according to values in any given column in Java
Java Program to Find Transpose of Matrix
Java Program to Find the Determinant of a Matrix
Java Program to Find the Normal and Trace of a Matrix
Java Program to Print Boundary Elements of the Matrix
Java Program to Rotate Matrix Elements
Java Program to Compute the Sum of Diagonals of a Matrix
Java Program to Interchange Elements of First and Last in a Matrix Across Rows
Java Program to Interchange Elements of First and Last in a Matrix Across Columns

Java String Programs

Java Program to get a character from a String
Replace a character at a specific index in a String in Java
Reverse a string in Java
Java Program to Reverse a String using Stack
Sort a String in Java (2 different ways)
Swapping Pairs of Characters in a String in Java
Check if a given string is Pangram in Java
Print first letter of each word in a string using regex
Java Program to Determine the Unicode Code Point at Given Index in String
Remove Leading Zeros From String in Java
Compare two Strings in Java
Compare two strings lexicographically in Java
Java program to print Even length words in a String
Insert a String into another String in Java
Split a String into a Number of Substrings in Java

Java List Programs

Initializing a List in Java
How to Find a Sublist in a List in Java?
Min and Max in a List in Java
Split a List into Two Halves in Java
How to remove a SubList from a List in Java
How to Remove Duplicates from ArrayList in Java
How to sort an ArrayList in Ascending Order in Java
Get first and last elements from ArrayList in Java
Convert a List of String to a comma separated String in Java
How to Add Element at First and Last Position of LinkedList in Java?
Find common elements in two ArrayLists in Java
Remove repeated elements from ArrayList in Java

Java Date and Time Programs

Java Program to Format Time in AM-PM format
Java Program to Display Dates of a Calendar Year in Different Format
Java Program to Display Current Date and Time
Java Program to Display Time in Different Country Format
How to Convert Local Time to GMT in Java?

Java File Programs

Java Program to Create a New File
Java Program to Create a Temporary File
Java Program to Rename a File
Java Program to Make a File Read-Only
Comparing Path of Two Files in Java
Different Ways to Copy Content From One File to Another File in Java
Java Program to Print all the Strings that Match a Given Pattern from a File
Java Program to Append a String in an Existing File
Java Program to Read Content From One File and Write it into Another File
Java Program to Read and Print All Files From a Zip File

Java Directory Programs

Java Program to Traverse in a Directory
Java Program to Get the Size of a Directory
Java Program to Delete a directory
Java Program to Create Directories Recursively
Java Program to Search for a File in a Directory
Java Program to Find Current Working Directory
Java Program to List all Files in a Directory and Nested Sub-Directories

Java Exceptions and Errors Programs

Exceptions in Java
Types of Errors in Java with Examples
Java Program to Handle the Exception Hierarchies
Java Program to Handle the Exception Methods
Java Program to Handle Checked Exception
Java Program to Handle Unchecked Exception
Java Program to Handle Divide By Zero and Multiple Exceptions
Unreachable Code Error in Java
Thread Interference and Memory Consistency Errors in Java

Java Collections Programs

Collections in Java
How to Print a Collection in Java?
Java Program to Compare Elements in a Collection
Java Program to Get the Size of Collection and Verify that Collection is Empty
Collections.shuffle() Method in Java with Examples
Collections.reverse() Method in Java with Examples
Java Program to Change a Collection to an Array
Convert an Array into Collection in Java
How to Replace a Element in Java ArrayList?
Java Program to Rotate Elements of the List
How to iterate any Map in Java

Java Multithreading Programs

Thread isAlive() Method in Java With Examples
How to Temporarily Stop a Thread in Java?
Joining Threads in Java
Daemon Thread in Java

Java More Java Programs

Program to Print Fibonacci Series in Java
How to convert LinkedList to Array in Java?
Program to Convert a Vector to List in Java
Convert a String to a List of Characters in Java
Convert an Iterator to a List in Java
Program to Convert List to Map in Java
Program to Convert List to Stream in Java
Convert List to Set in Java
Java Program to Convert InputStream to String
Convert Set of String to Array of String in Java
Java Program to Convert String to Object
How to Convert a String value to Byte value in Java with Examples

Java Programs – Java Programming Examples

Java is one of the most popular programming languages today because of its simplicity. Java programming concepts such as control statements, Arrays, Strings, Object-Oriented Programming (OOP) , etc. are very important from an interview perspective as well as from exams.

So, whether you are a fresher preparing for job interviews or a beginner who has covered Java Fundamentals and wants to practice Java concepts then, this J ava Programming Examples page covers a wide range of Java programs in an organized manner.

In this article, we will learn and prepare for Interviews using Java Programming Examples . From basic Java programs like the Fibonacci series , Prime numbers , Factorial numbers , and Palindrome numbers to advanced Java programs.

So, keep scrolling or bookmark this page to learn about Java (Basic to Advanced) using Java Programming Examples.

Table of Content

This section, “Java Basic Programs,” provides a launchpad if you are new to Java programming. Here, you’ll encounter a collection of fundamental Java programs, that is crafted to introduce you to the core syntax, data structures, and control flow mechanisms of Java development.

Java Program to Read The Number From Standard Input
Java Program to Get Input from the User
Java Program to Multiply Two Floating-Point Numbers
Java Program to Add Two Complex Numbers
Java Program to Check Even or Odd Integers
Java Program to Find Largest Among 3 Numbers
Java Program to Find LCM of 2 numbers
Java Program to Find GCD or HCF of 2 numbers
Java Program to Check Leap Year
Java Program to Check whether the input number is a Neon Number
Java Program to Check whether input character is vowel or consonant
Java Program to Find Factorial of a number
Java Program to Find Even Sum of Fibonacci Series Till number N
Java Program to Calculate Compound Interest

In this section, you will get a list of Java programming language that deals with patterns. By meticulously arranging stars, numbers, or characters, you’ll not only solidify your grasp of Java loops and control structures but also discover the aesthetic side of programming.

Java Program to Print Star Pascal’s Triangle
Java Program to Print Diamond Star Pattern

Java Conversion Programs put your coding skills to the test. Here, you’ll encounter a series of exercises designed to strengthen your ability to transform data, like converting Binary to Decimal and more.

Java Program For Binary to Octal Conversion
Java Program For Octal to Decimal Conversion
Java Program For Decimal to Binary Conversion
Java Program For Binary to Decimal Conversion
Java Program For Boolean to String Conversion
Java Program For String to Double Conversion
Java Program For Double to String Conversion
Java Program For String to Long Conversion
Java Program For Long to String Conversion
Java Program For Char to Int Conversion

Here in this section, you will dive into the world of classes, acting as blueprints for objects, and objects themselves, the real-life entities.

Java Program to Create a Class and Object
Java Program to Create Abstract Class
Java Program to Create Singleton Class
Java Program to Create an Interface
Java Program to Show Encapsulation in Class
Java Program to Show Inheritance in Class
Java Program to Show Abstraction in Class
Java Program to Show Data Hiding in Class
Java Program to Show Polymorphism in Class
Java Program to Show Overloading of Methods in Class
Java Program to Show Overriding of Methods in Classes
Java Program to Show Use of Super Keyword in Class
Java Program to Show Use of This Keyword in Class
Java Program to Show Usage of Static keyword in Class
Java Program to Show Usage of Access Modifier

This section unlocks the secrets of methods, the building blocks of reusability in object-oriented programming. Here, you’ll embark on a hands-on journey, crafting and wielding methods like a programming pro.

Java Program to Show Usage of Main() method
Java Program to Show Use of Static and Non-static Methods
Java Program to Show Usage of forEach() Method
Java Program to Show Usage of toString() Method
Java Program to Show Usage of codePointAt() Method
Java Program to Show Usage of compare() Method
Java Program to Show Usage of equals() Method
Java Program to Show Usage of hasNext() and next() Method
start() Method
run() Method

Looking for the Java Search related programs, hence here in this section we have listed down multiple searching Java programming examples.

Java Program For Linear Search
Java Program For Binary Search
Java Program to Recursively Linearly Search an Element in an Array

This section is all about organizing things in your Java code. Here, you’ll learn how to create these “cabinets,” put things in them, and take them out whenever you need them.

Java Program to Search an Element in an Array
Java Program to Find the Largest Element in an Array
Java Program to Sort an Array
Java Program to Sort the Elements of an Array in Descending Order
Java Program to Remove Duplicate Elements From an Array
Java Program to Check if Two Arrays Are Equal or Not
Java Program to Remove All Occurrences of an Element in an Array
Java Program to Find Common Array Elements
Java Program to Copy All the Elements of One Array to Another Array

This section dives into two-dimensional arrays, which are like spreadsheets for your code. Imagine organizing data in rows and columns, perfect for things like tables or images.

Java Program to Print a 2D Array
Java Program to Add Two Matrices
Java Program to Sort the 2D Array Across Columns
Java Program to Check Whether Two Matrices Are Equal or Not
Java Program to Find the Transpose
Java Program to Find the Determinant
Java Program to Find the Normal and Trace
Java Program to Print Boundary Elements of a Matrix

In this section, you will dive deep into working with text in Java. You’ll learn to manipulate, analyze, and modify strings, the fundamental building blocks of text data, with the help of multiple Java String programs.

Java Program to Get a Character From the Given String
Java Program to Replace a Character at a Specific Index
Java Program to Reverse a String
Java Program to Reverse a String Using Stacks
Java Program to Sort a String
Java Program to Swapping Pair of Characters
Java Program to Check Whether the Given String is Pangram
Java Program to Print first letter of each word using regex
Java Program to Determine the Unicode Code Point at a given index
Java Program to Remove leading zeros
Java Program to Compare two strings
Java Program to Compare two strings lexicographically
Java Program to Print even length words
Java Program to Insert a string into another string
Java Program to Splitting into a number of sub-strings

Dive into the world of Java Lists, a fundamental data structure in Java. Here, you’ll learn how to store, access, and manipulate elements in a specific sequence.

Java Program to Initializing a List
Java Program to Find a Sublist in a List
Java Program to Get Minimum and Maximum From a List
Java Program to Split a list into Two Halves
Java Program to Remove a Sublist from a List
Java Program to Remove Duplicates from an Array List
Java Program to Remove Null from a List container
Java Program to Sort Array List in an Ascending Order
Java Program to Get First and Last Elements from an Array List
Java Program to Convert a List of String to Comma Separated String
Java Program to Add Element at First and Last Position of a Linked list
Java Program to Find Common Elements in Two ArrayList
Java Program to Remove Repeated Element From An ArrayList

This section gives you to handle the ever-changing world of dates and times within your Java programs. Explore the working with calendars, timestamps, and time manipulation – essential skills for building applications that deal with deadlines, scheduling, or even historical data analysis.

Java Program to Format time in AM-PM format
Java Program to Display Dates of Calendar Year in Different Format
Java Program to Display current date and time
Java Program to Display time in different country’s format
Java Program to Convert the local Time to GMT

Java File Programs empowers you to interact with files in Java. This section dives deep into reading, writing, and manipulating data stored outside your program.

Java Program to Create a new file
Java Program to Create a temporary file
Java Program to Write into a file
Java Program to Rename a file in java
Java Program to Compare Paths of Two files
Java Program to Copy one file into another file
Java Program to Print all the Pattern that Matches Given Pattern From a File
Java Program to Read content from one file and writing it into another file
Java Program to Read and printing all files from a zip file

This section navigate you to the world of directories and files in Java. Through this Java programming examples “Java Directory” section you’ll master creating, manipulating, and interacting with directories.

Java Program to Traverse in a directory
Java Program to Get the size of a directory
Java Program to Delete a Directory
Java Program to Create directories recursively
Java Program to Search for a file in a directory
Java Program to Find the current working directory
Java Program to Display all the directories in a directory

Through a series of hands-on exercises on Java Exceptions and Errors Handling programs, you will easily get to know how to become a good Java programmer.

Java Program to Show Runtime Exceptions
Java Program to Show Types of Errors
Java program to Handle the Checked exceptions
Java Program to Handle the Unchecked Exceptions
Java Program to Show Unreachable Code Error
Java Program to Show Thread interface and memory consistency errors

Java Collections is not just about storing your data in Java; So practicing Java Collections programs will help you boost your organization skills. Get deep down into lists, sets, maps, and more, and discover how to structure your data effectively to build robust and efficient Java applications.

Java Program to Use Different Types of Collection
Java Program to Print a Collection
Java Program to Get the Size of the Collection
Java Program to Shuffle the Elements of a Collection
Java Program to Reverse a Collection
Java Program to Convert Collection into Array
Java Program to Convert Array into Collection
Java Program to Replace Elements in a List
Java Program to Rotate Elements of a List
Java Program to Iterate through Elements of HashMap

In this section you will get hand on Java Multithreading programs. It will help you to conquer the art of threading, a technique that lets your program handle multiple tasks seemingly at once.

Java Program to Check the Thread Status
Java Program to Suspend a thread
Java Program to Join Threads
Java Program to Show Daemon Thread

This section extends your coding experience with a diverse array of programs that explore more intricate functionalities. Brace yourself to tackle problems that involve algorithms, data manipulation, and object-oriented programming concepts.

Java Program to Print Fibonacci Series in Different Ways
Java Program to Convert Linked List to an Array
Java Program to Convert Vector to a List
Java Program to Convert String to a List of Characters
Java Program to Convert Iterator to a List
Java Program to Convert List to a Map
Java Program to Convert List to a Stream
Java Program to Convert List to Set
Java Program to Convert Set of String to Array of String
Java Program to Convert string value to byte value

In this article, we dealt with a variety of Java programming questions categorized as basic programs, control statements, Arrays , Strings , OOPs , and much more that are frequently asked in interviews and exams.

Each Java program will give you a different approach to solving a particular problem in Java. If you are new to Java programming, we highly recommend you to go through our article on Java tutorial , where we’ve covered all the basics and advanced topics of Java programming with practical examples and programs.

Click Here to Check out Java Exercise to Practice Java Problems Online.

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45 Java Programming Exercises With Solutions

If you have learned the basics of Java , it is the right time to solve some practice problems. Practicing and solving problems will help you master the Java programming language and take your skills to the next level.

In this post, I have put together some Java coding problems that you can use for practice. I have also provided the Java code solutions and the corresponding output for your reference.

Try to solve these problems by yourself and get better at Java. Let’s dive right in.

Java Programming Exercises With Solutions

1. Java program to check whether the given number is even or odd

2. java program to convert the temperature in centigrade to fahrenheit, 3. java program to find the area of a triangle whose three sides are given, 4. java program to find out the average of a set of integers, 5. java program to find the product of a set of real numbers, 6. java program to find the circumference and area of a circle with a given radius, 7. java program to check whether the given integer is a multiple of 5, 8. java program to check whether the given integer is a multiple of both 5 and 7, 9. java program to find the average of 5 numbers using a while loop, 10. java program to display the given integer in the reverse order, 11. java program to find the geometric mean of n numbers, 12. java program to find the sum of the digits of an integer using a while loop, 13. java program to display all the multiples of 3 within the range 10 to 50, 14. java program to display all integers within the range 100-150 whose sum of digits is an even number, 15. java program to check whether the given integer is a prime number or not, 16. java program to generate the prime numbers from 1 to n, 17. java program to find the roots of a quadratic equation, 18. java program to print the numbers from a given number n till 0 using recursion, 19. java program to find the factorial of a number using recursion, 20. java program to display the sum of n numbers using an array, 21. java program to implement linear search, 22. java program to implement binary search, 23. java program to find the number of odd numbers in an array, 24. java program to find the largest number in an array without using built-in functions, 25. java program to insert a number to any position in an array, 26. java program to delete an element from an array by index, 27. java program to check whether a string is a palindrome or not, 28. java program to implement matrix addition, 29. java program to implement matrix multiplication, 30. java program to check leap year, 31. java program to find the nth term in a fibonacci series using recursion, 32. java program to print fibonacci series using iteration, 33. java program to implement a calculator to do basic operations, 34. java program to find your weight on mars.

Mars’ gravity is about 38% of Earth’s. Write a program that will calculate your weight on Mars.

Declare all variables at the top of the class.
Initial variables are to be of float type.
After making the calculations, assign the result to a new variable, this time of the double type.
After assigning the assignment, write the variable double to the console, limiting its length to 4 decimal places.
Cast the above variable of double type to a new variable of int type.
Cast the above variable of type int to a new variable of type char.
Do any math operation on this variable char type and assign the value of this activity to the new variable int type.
Each of the above actions should be written to the console, adding some text explaining what has been done.

35. Java Program to Check Whether the Generated Random Number Is Even or Odd

Write a program that generates a random number between 1 and 100 (you can use the Random () method from the Math class.

In the next step check whether it is an even or an odd number. Each of the above actions should be written to the console.

36. Java Program to Find the Number of Containers You Need

Choose an odd number between 50 and 100 and save it as an int variable telling us how many Lego bricks we have (e.g. amountOfBricks ), then select an even number between 5 and 10 stating how many Lego blocks fit in one container (e.g.: containerCapacity ) and save it as an int variable as well.

Write a program that will calculate how many full containers we have, how many containers, in general, are full and not full, and how many blocks are in the container that is not completely full (use the modulo operator for this).

37. Java Program to Calculate Taxes

Using the double types, implement the following: Suppose a product costs 9.99 net, calculate its gross value (we assume VAT of 23%). Then multiply it by 10,000 (i.e., we sold 10,000 pcs of this product), and calculate this value excluding VAT.

Implement the above actions using the Big Decimal class. Print on the console all computed values and compare their values. What conclusions do you have?

38. Calculate BMI Using Java

The user enters his height (in inches) and weight (in pounds). The variables passed by the user are assigned to the float type. After calculating the BMI value, the value will be assigned to the appropriate range and the correct message will appear on the console. You can use the if-else-if ladder for printing the message on the console.

Intervals of BMI index:

16.00 or less = starvation
16.00-16.99 = emaciation
17.00-18.49 = underweight
18.50-22.99 = normal, low range
23.00-24.99 = normal high range
25.00-27.49 = overweight low range
27.50-29.99 = overweight high range
30.00-34.99 = 1st degree obesity
35.00-39.99 = 2nd degree obesity
40.00 or above = 3rd degree obesity

39. Java Program to Find the Sum of Even Numbers

Write a program that sums even numbers from 1 to 100 using for loop.

40. Java Program to Find the Largest and Smallest Numbers From Random Numbers

Write a program that will use the while loop to find the largest and smallest number from the set of 10 randomly drawn integers from 1 to 100. In this task, do not use arrays or other collections.

41. Java Program to Calculate the Area of a Rectangle

Write a program that follows the rules of object-oriented programming and will calculate the area of the rectangle.

You need to create two classes, one RectangleArea for the logic of your program and the Main class. In the Main class, we create the RectangleArea object and call three methods on it.

The methods you should create are:

getData(), gets side lengths from the
computeField(), performs
fieldDisplay(), displays info and result.

42. Returning Information About an Object in Java

Declare the class Car and define the following fields of this class (with the access modifier private): model, brand, year, price, color, and quantity.

Create a constructor of this class consisting of the previously mentioned fields. Create methods to return each of the fields and methods to set values for each of the fields. Additionally, create the sell() method (simulating car sales) which will change the value of the quantity field when called.

The last method to create is the toString() method that returns an object of type String and prints the names of all fields of a given object and values.

Create another class with the main() method in it. Create an object of the Car class by using the constructor. Call the toString() method and print the details.

Call the sell() method. Print all fields (using the previously declared getter methods of the object field).

Using the setter methods, change some fields of the object. Call the toString() method and print the details to notice the changes.

43. Filling an Array Using For Loops in Java

Write a program that creates a 10-element array and puts the numbers from 9 to 0 in it.

Use the classic for loop to fill the array, and in the condition, use the array.length method. Use for-each loop as a second loop to display the value of the array.

44. Java Program to Find the Largest and Smallest Numbers From an Array of Random Numbers

Write a program that will create a one-dimensional array with 10 elements that are chosen randomly from 1 to 100. Then use a loop to find the smallest and largest element in the array.

45. Two-dimensional Array in Java

Write a program that creates a two-dimensional array with dimensions of 10×10 and named matrix. On the diagonal of this matrix, put the numbers from 0 to 9 and the number 0 everywhere else. Additionally, the program should calculate the sum of the elements on the diagonal.

I'm the face behind Pythonista Planet. I learned my first programming language back in 2015. Ever since then, I've been learning programming and immersing myself in technology. On this site, I share everything that I've learned about computer programming.

6 thoughts on “ 45 Java Programming Exercises With Solutions ”

What a wonderful template! I found what I needed and more, Keep It Up Legend <3

* *2 *2* *2*4 *2*4*

Drawn above pattern in java ?

Your Centigrade converter doesn’t work. You need 9f instead of 9, or rounding will give you the wrong answer.

Thank you for pointing out the mistake. I have corrected the code.

It is to most and very workfull 🤩🤩

You have done it well, sir

Java Assignment Operators

Description.

Assigning a value to a variable seems straightforward enough; you simply assign the stuff on the right side of the '= 'to the variable on the left. Below statement 1 assigning value 10 to variable x and statement 2 is creating String object called name and assigning value "Amit" to it.

Assignment can be of various types. Let’s discuss each in detail.

Primitive Assignment:

The equal (=) sign is used for assigning a value to a variable. We can assign a primitive variable using a literal or the result of an expression.

Primitive Casting

Casting lets you convert primitive values from one type to another. We need to provide casting when we are trying to assign higher precision primitive to lower precision primitive for example If we try to assign int variable (which is in the range of byte variable) to byte variable then the compiler will throw an exception called "possible loss of precision". Eclipse IDE will suggest the solution as well as shown below. To avoid such problem we should use type casting which will instruct compiler for type conversion.

For cases where we try to assign smaller container variable to larger container variables we do not need of explicit casting. The compiler will take care of those type conversions. For example, we can assign byte variable or short variable to an int without any explicit casting.

Assigning Literal that is too large for a variable

When we try to assign a variable value which is too large (or out of range ) for a primitive variable then the compiler will throw exception “possible loss of precision” if we try to provide explicit cast then the compiler will accept it but narrowed down the value using two’s complement method. Let’s take an example of the byte which has 8-bit storage space and range -128 to 127. In below program we are trying to assign 129 literal value to byte primitive type which is out of range for byte so compiler converted it to -127 using two’s complement method. Refer link for two’s complement calculation (https://en.wikipedia.org/wiki/Two's_complement)

Java Code: Go to the editor

Reference variable assignment

We can assign newly created object to object reference variable as below

First line will do following things,

Makes a reference variable named s of type String
Creates a new String object on the heap memory
Assigns the newly created String object to the reference variables

You can also assign null to an object reference variable, which simply means the variable is not referring to any object. The below statement creates space for the Employee reference variable (the bit holder for a reference value) but doesn't create an actual Employee object.

Compound Assignment Operators

Sometime we need to modify the same variable value and reassigned it to a same reference variable. Java allows you to combine assignment and addition operators using a shorthand operator. For example, the preceding statement can be written as:

The += is called the addition assignment operator. Other shorthand operators are shown below table

Below is the sample program explaining assignment operators:

Assigning a value to can be straight forward or casting.
If we assign the value which is out of range of variable type then 2’s complement is assigned.
Java supports shortcut/compound assignment operator.

Java Code Editor:

Previous: Wrapper classes Next: Arithmetic Operator

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Java Fundamentals

Java Variables and Literals
Java Data Types (Primitive)
Java Operators
Java Basic Input and Output
Java Expressions, Statements and Blocks

Java Flow Control

Java if...else Statement
Java Ternary Operator
Java for Loop
Java for-each Loop
Java while and do...while Loop
Java break Statement
Java continue Statement
Java switch Statement
Java Arrays
Java Multidimensional Arrays
Java Copy Arrays

Java OOP(I)

Java Class and Objects
Java Methods
Java Method Overloading
Java Constructors
Java Static Keyword
Java Strings
Java Access Modifiers
Java this Keyword
Java final keyword
Java Recursion

Java instanceof Operator

Java OOP(II)

Java inheritance.

Java Method Overriding

Java Abstract Class and Abstract Methods

Java Interface
Java Polymorphism
Java Encapsulation

Java OOP(III)

Java Nested and Inner Class
Java Nested Static Class
Java Anonymous Class
Java Singleton Class
Java enum Constructor
Java enum Strings
Java Reflection
Java Package
Java Exception Handling
Java Exceptions
Java try...catch
Java throw and throws
Java catch Multiple Exceptions
Java try-with-resources
Java Annotations
Java Annotation Types
Java Logging
Java Assertions
Java Collections Framework
Java Collection Interface
Java ArrayList
Java Vector
Java Stack Class
Java Queue Interface
Java PriorityQueue
Java Deque Interface
Java LinkedList
Java ArrayDeque
Java BlockingQueue
Java ArrayBlockingQueue
Java LinkedBlockingQueue
Java Map Interface
Java HashMap
Java LinkedHashMap
Java WeakHashMap
Java EnumMap
Java SortedMap Interface
Java NavigableMap Interface
Java TreeMap
Java ConcurrentMap Interface
Java ConcurrentHashMap
Java Set Interface
Java HashSet Class
Java EnumSet
Java LinkedHashSet
Java SortedSet Interface
Java NavigableSet Interface
Java TreeSet
Java Algorithms
Java Iterator Interface
Java ListIterator Interface

Java I/o Streams

Java I/O Streams
Java InputStream Class
Java OutputStream Class
Java FileInputStream Class
Java FileOutputStream Class
Java ByteArrayInputStream Class
Java ByteArrayOutputStream Class
Java ObjectInputStream Class
Java ObjectOutputStream Class
Java BufferedInputStream Class
Java BufferedOutputStream Class
Java PrintStream Class

Java Reader/Writer

Java File Class
Java Reader Class
Java Writer Class
Java InputStreamReader Class
Java OutputStreamWriter Class
Java FileReader Class
Java FileWriter Class
Java BufferedReader
Java BufferedWriter Class
Java StringReader Class
Java StringWriter Class
Java PrintWriter Class

Additional Topics

Java Keywords and Identifiers
Java Operator Precedence
Java Bitwise and Shift Operators
Java Scanner Class
Java Type Casting
Java Wrapper Class
Java autoboxing and unboxing
Java Lambda Expressions
Java Generics
Nested Loop in Java
Java Command-Line Arguments

Java Tutorials

Java enum Inheritance and Interface

Inheritance is one of the key features of OOP that allows us to create a new class from an existing class.

The new class that is created is known as subclass (child or derived class) and the existing class from where the child class is derived is known as superclass (parent or base class).

The extends keyword is used to perform inheritance in Java. For example,

In the above example, the Dog class is created by inheriting the methods and fields from the Animal class.

Here, Dog is the subclass and Animal is the superclass.

Example 1: Java Inheritance

In the above example, we have derived a subclass Dog from superclass Animal . Notice the statements,

Here, labrador is an object of Dog . However, name and eat() are the members of the Animal class.

Since Dog inherits the field and method from Animal , we are able to access the field and method using the object of the Dog .

Subclass Dog can access the field and method of the superclass Animal.

is-a relationship

In Java, inheritance is an is-a relationship. That is, we use inheritance only if there exists an is-a relationship between two classes. For example,

Car is a Vehicle
Orange is a Fruit
Surgeon is a Doctor
Dog is an Animal

Here, Car can inherit from Vehicle , Orange can inherit from Fruit , and so on.

Method Overriding in Java Inheritance

In Example 1 , we see the object of the subclass can access the method of the superclass.

However, if the same method is present in both the superclass and subclass, what will happen?

In this case, the method in the subclass overrides the method in the superclass. This concept is known as method overriding in Java.

Example 2: Method overriding in Java Inheritance

In the above example, the eat() method is present in both the superclass Animal and the subclass Dog .

Here, we have created an object labrador of Dog .

Now when we call eat() using the object labrador , the method inside Dog is called. This is because the method inside the derived class overrides the method inside the base class.

This is called method overriding. To learn more, visit Java Method Overriding .

Note : We have used the @Override annotation to tell the compiler that we are overriding a method. However, the annotation is not mandatory. To learn more, visit Java Annotations .

super Keyword in Java Inheritance

Previously we saw that the same method in the subclass overrides the method in superclass.

In such a situation, the super keyword is used to call the method of the parent class from the method of the child class.

Example 3: super Keyword in Inheritance

In the above example, the eat() method is present in both the base class Animal and the derived class Dog . Notice the statement,

Here, the super keyword is used to call the eat() method present in the superclass.

We can also use the super keyword to call the constructor of the superclass from the constructor of the subclass. To learn more, visit Java super keyword .

protected Members in Inheritance

In Java, if a class includes protected fields and methods, then these fields and methods are accessible from the subclass of the class.

Example 4: protected Members in Inheritance

In the above example, we have created a class named Animal. The class includes a protected field: name and a method: display() .

We have inherited the Dog class inherits Animal . Notice the statement,

Here, we are able to access the protected field and method of the superclass using the labrador object of the subclass.

Why use inheritance?
The most important use of inheritance in Java is code reusability. The code that is present in the parent class can be directly used by the child class.
Method overriding is also known as runtime polymorphism. Hence, we can achieve Polymorphism in Java with the help of inheritance.
Types of inheritance

There are five types of inheritance.

1. Single Inheritance

In single inheritance, a single subclass extends from a single superclass. For example,

2. Multilevel Inheritance

In multilevel inheritance, a subclass extends from a superclass and then the same subclass acts as a superclass for another class. For example,

Class B inherits from class A and class C inherits from class B.

3. Hierarchical Inheritance

In hierarchical inheritance, multiple subclasses extend from a single superclass. For example,

Both classes B and C inherit from the single class A.

4. Multiple Inheritance

In multiple inheritance, a single subclass extends from multiple superclasses. For example,

Class C inherits from both classes A and B.

Note : Java doesn't support multiple inheritance. However, we can achieve multiple inheritance using interfaces. To learn more, visit Java implements multiple inheritance .

5. Hybrid Inheritance

Hybrid inheritance is a combination of two or more types of inheritance. For example,

Class B and C inherit from a single class A and class D inherits from both the class B and C.

Here, we have combined hierarchical and multiple inheritance to form a hybrid inheritance.

Introduction
Example: Java Inheritance
Method Overriding Inheritance
super Keyword Inheritance
protected Members and Inheritance

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