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Java Exercises - Basic to Advanced Java Practice Programs with Solutions

Looking for Java exercises to test your Java skills, then explore our topic-wise Java practice exercises? Here you will get 25 plus practice problems that help to upscale your Java skills.

As we know Java is one of the most popular languages because of its robust and secure nature. But, programmers often find it difficult to find a platform for Java Practice Online. In this article, we have provided Java Practice Programs. That covers various Java Core Topics that can help users with Java Practice.

So, with ado further take a look at our free Java Exercises to practice and develop your Java programming skills. Our Java programming exercises Practice Questions from all the major topics like loops, object-oriented programming, exception handling, and many more.

Topic Wise Java Exercises List

  • Pattern Programs in Java
  • Array Programs in Java
  • String Programs in Java

Java Practice Problems for Searching Algorithms

Practice problems in java sorting algorithms, more java practice exercises.

Java Exercise

Java Practice Programs

This Java exercise is designed to deepen your understanding and refine your Java coding skills, these programs offer hands-on experience in solving real-world problems, reinforcing key concepts, and mastering Java programming fundamentals. Whether you’re a beginner who looking to build a solid foundation or a professional developer aiming to sharpen your expertise, our Java practice programs provide an invaluable opportunity to sharpen your craft and excel in Java programming language .

Java enthusiasts can also benefit from practicing various java exercises on the GeeksforGeeks Online Practice Platform , where challenges cater to both beginners and advanced programmers.

By diving into these exercises, you’ll not only reinforce key concepts but also gain the practical experience needed to tackle real-world problems effectively. This hands-on practice is essential for mastering Java fundamentals and advancing your career as a proficient Java developer. To further enhance your skills, consider enrolling in our Java Course . This course offers comprehensive lessons and practical exercises, making it an excellent resource for both beginners and experienced developers.

1. Write Hello World Program in Java

The solution to the Problem is mentioned below:

2. Write a Program in Java to Add two Numbers.

Click here for the solution, 3. write a program to swap two numbers, 4. write a java program to convert integer numbers and binary numbers., 5. write a program to find factorial of a number in java., 6. write a java program to add two complex numbers., 7. write a program to calculate simple interest in java, 8. write a program to print the pascal’s triangle in java, 9. write a program to find sum of fibonacci series number, java exercise on pattern.

Pattern Exercises in Java

10. Write a Program to Print Pyramid Number Pattern in Java.

11. write a java program to print pattern., 12. write a java program to print pattern., 13. java program to print patterns., array exercises in java.

Array Exercises in Java

14. Write a Java Program to Compute the Sum of Array Elements.

15. write a java program to find the largest element in array, 16. write java program to find the tranpose of matrix, 17. java array program for array rotation, 18. java array program to remove duplicate elements from an array, 19. java array program to remove all occurrences of an element in an array, string exercises in java.

Strings Exercises in Java

20. Java program to check whether a string is a Palindrome

21. java string program to check anagram, 22. java string program to reverse a string, 23. java string program to remove leading zeros.

Searching Exercises in Java

24. Write a Java Program for Linear Search.

Time Complexity: O(N) Space Complexity: O(N)

25. Write a Binary Search Program in Java.

Time Complexity: O(logN) Space Complexity: O(N)

Sorting_in_java

26. Java Program for Bubble Sort.

Time Complexity: O(N 2 ) Space Complexity: O(1)

27. Write a Program for Insertion Sort in Java.

28. java program for selection sort., 29. java program for merge sort..

Time Complexity: O(N logN) Space Complexity: O(N)

30. Java Program for QuickSort.

Time Complexity: O(N logN) Space Complexity: O(1)

After completing these Java exercises you are a step closer to becoming an advanced Java programmer. We hope these exercises have helped you understand Java better and you can solve beginner to advanced-level questions on Java programming.

Solving these Java programming exercise questions will not only help you master theory concepts but also grasp their practical applications, which is very useful in job interviews.

Java Array Exercise Java String Exercise Java Collection Exercise Click Here – To Practice Java Online please check our Practice Portal.

Java Exercise – FAQ

1. how to do java projects for beginners.

To do Java projects you need to know the fundamentals of Java programming. Then you need to select the desired Java project you want to work on. Plan and execute the code to finish the project. Some beginner-level Java projects include: Reversing a String Number Guessing Game Creating a Calculator Simple Banking Application Basic Android Application

2. Is Java easy for beginners?

As a programming language, Java is considered moderately easy to learn. It is unique from other languages due to its lengthy syntax. As a beginner, you can learn beginner to advanced Java in 6 to 18 months.

3. Why Java is used?

Java provides many advantages and uses, some of which are: Platform-independent Robust and secure Object-oriented Popular & in-demand Vast ecosystem

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Welcome to the world of Java programming! Java is a popular object-oriented programming language that is used in many different industries.

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Conditionals and control flow in Java programs.

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Java Programming Exercises, Practice, Solution

Java exercises.

Java is the foundation for virtually every type of networked application and is the global standard for developing and delivering embedded and mobile applications, games, Web-based content, and enterprise software. With more than 9 million developers worldwide, Java enables you to efficiently develop, deploy and use exciting applications and services.

The best way we learn anything is by practice and exercise questions. Here you have the opportunity to practice the Java programming language concepts by solving the exercises starting from basic to more complex exercises. A sample solution is provided for each exercise. It is recommended to do these exercises by yourself first before checking the solution.

Hope, these exercises help you to improve your Java programming coding skills. Currently, following sections are available, we are working hard to add more exercises .... Happy Coding!

List of Java Exercises:

  • Basic Exercises Part-I [ 150 Exercises with Solution ]
  • Basic Exercises Part-II [ 99 Exercises with Solution ]
  • Methods [ 23 Exercises with Solution ]
  • Data Types Exercises [ 15 Exercises with Solution ]
  • Java Enum Types Exercises [ 5 Exercises with Solution ]
  • Conditional Statement Exercises [ 32 Exercises with Solution ]
  • Java recursive method Exercises [ 15 Exercises with Solution ]
  • Math [ 27 Exercises with Solution ]
  • Numbers [ 28 Exercises with Solution ]
  • Java Constructor Exercises [ 10 exercises with solution ]
  • Java Static Members Exercises [ 8 exercises with solution ]
  • Java Nested Classes Exercises [ 10 exercises with solution ]
  • Java Inheritance Exercises [ 9 exercises with solution ]
  • Java Abstract Classes Exercises [ 12 exercises with solution ]
  • Java Interface Exercises [ 11 exercises with solution ]
  • Java Encapsulation Exercises [ 14 exercises with solution ]
  • Java Polymorphism Exercises [ 12 exercises with solution ]
  • Object-Oriented Programming [ 30 Exercises with Solution ]
  • Exercises on handling and managing exceptions in Java [ 7 Exercises with Solution ]
  • Java Lambda expression Exercises [ 25 exercises with solution ]
  • Streams [ 8 Exercises with Solution ]
  • Java Thread Exercises [ 7 exercises with solution ]
  • Java Miltithreading Exercises [ 10 exercises with solution ]
  • Array [ 77 Exercises with Solution ]
  • Stack [ 29 Exercises with Solution ]
  • Collection [ 126 Exercises with Solution ]
  • String [ 107 Exercises with Solution ]
  • Input-Output-File-System [ 18 Exercises with Solution ]
  • Date Time [ 44 Exercises with Solution ]
  • Java Generic Methods [ 7 exercises with solution ]
  • Java Unit Test [ 10 Exercises with Solution ]
  • Search [ 7 Exercises with Solution ]
  • Sorting [ 19 Exercises with Solution ]
  • Regular Expression [ 30 Exercises with Solution ]
  • JavaFX [ 70 Exercises with Solution ]
  • Java Projects for Beginners with Solutions and Explanation

Note: If you are not habituated with Java programming you can learn from the following :

  • Java Programming Language

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List of Exercises with Solutions :

  • HTML CSS Exercises, Practice, Solution
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In Java programming, commands are essential instructions that tell the computer what to do. These commands are written in a specific way so the computer can understand and execute them. Every program in Java is a set of commands. At the beginning of your Java programming practice , it’s good to know a few basic principles:

  • In Java, each command ends with a semicolon;
  • A command can't exist on its own: it’s a part of a method, and method is part of a class;
  • Method (procedure, function) is a sequence of commands. Methods define the behavior of an object.

Here is an example of the command:

The command System.out.println("Hello, World!"); tells the computer to display the text inside the quotation marks.

If you want to display a number and not text, then you do not need to put quotation marks. You can simply write the number. Or an arithmetic operation. For example:

Command to display the number 1.

A command in which two numbers are summed and their sum (10) is displayed.

As we discussed in the basic rules, a command cannot exist on its own in Java. It must be within a method, and a method must be within a class. Here is the simplest program that prints the string "Hello, World!".

We have a class called HelloWorld , a method called main() , and the command System.out.println("Hello, World!") . You may not understand everything in the code yet, but that's okay! You'll learn more about it later. The good news is that you can already write your first program with the knowledge you've gained.

Attention! You can add comments in your code. Comments in Java are lines of code that are ignored by the compiler, but you can mark with them your code to make it clear for you and other programmers.

Single-line comments start with two forward slashes (//) and end at the end of the line. In example above we have a comment //here we print the text out

You can read the theory on this topic here , here , and here . But try practicing first!

Explore the Java coding exercises for practicing with commands below. First, read the conditions, scroll down to the Solution box, and type your solution. Then, click Verify (above the Conditions box) to check the correctness of your program.

java homework help

The two main types in Java are String and int. We store strings/text in String, and integers (whole numbers) in int. We have already used strings and integers in previous examples without explicit declaration, by specifying them directly in the System.out.println() operator.

In the first case “I am a string” is a String in the second case 5 is an integer of type int. However, most often, in order to manipulate data, variables must be declared before being used in the program. To do this, you need to specify the type of the variable and its name. You can also set a variable to a specific value, or you can do this later. Example:

Here we declared a variable called a but didn't give it any value, declared a variable b and gave it the value 5 , declared a string called s and gave it the value Hello, World!

Attention! In Java, the = sign is not an equals sign, but an assignment operator. That is, the variable (you can imagine it as an empty box) is assigned the value that is on the right (you can imagine that this value was put in the empty box).

We created an integer variable named a with the first command and assigned it the value 5 with the second command.

Before moving on to practice, let's look at an example program where we will declare variables and assign values to them:

In the program, we first declared an int variable named a but did not immediately assign it a value. Then we declared an int variable named b and "put" the value 5 in it. Then we declared a string named s and assigned it the value "Hello, World!" After that, we assigned the value 2 to the variable a that we declared earlier, and then we printed the variable a, the sum of the variables a and b, and the variable s to the screen

This program will display the following:

We already know how to print to the console, but how do we read from it? For this, we use the Scanner class. To use Scanner, we first need to create an instance of the class. We can do this with the following code:

Once we have created an instance of Scanner, we can use the next() method to read input from the console or nextInt() if we should read an integer.

The following code reads a number from the console and prints it to the console:

Here we first import a library scanner, then ask a user to enter a number. Later we created a scanner to read the user's input and print the input out.

This code will print the following output in case of user’s input is 5:

More information about the topic you could read here , here , and here .

See the exercises on Types and keyboard input to practice Java coding:

Conditions and If statements in Java allow your program to make decisions. For example, you can use them to check if a user has entered a valid password, or to determine whether a number is even or odd. For this purpose, there’s an 'if/else statement' in Java.

The syntax for an if statement is as follows:

Here could be one or more conditions in if and zero or one condition in else.

Here's a simple example:

In this example, we check if the variable "age" is greater than or equal to 18. If it is, we print "You are an adult." If not, we print "You are a minor."

Here are some Java practice exercises to understand Conditions and If statements:

In Java, a "boolean" is a data type that can have one of two values: true or false. Here's a simple example:

The output of this program is here:

In addition to representing true or false values, booleans in Java can be combined using logical operators. Here, we introduce the logical AND (&&) and logical OR (||) operators.

  • && (AND) returns true if both operands are true. In our example, isBothFunAndEasy is true because Java is fun (isJavaFun is true) and coding is not easy (isCodingEasy is false).
  • || (OR) returns true if at least one operand is true. In our example, isEitherFunOrEasy is true because Java is fun (isJavaFun is true), even though coding is not easy (isCodingEasy is false).
  • The NOT operator (!) is unary, meaning it operates on a single boolean value. It negates the value, so !isCodingEasy is true because it reverses the false value of isCodingEasy.

So the output of this program is:

More information about the topic you could read here , and here .

Here are some Java exercises to practice booleans:

With loops, you can execute any command or a block of commands multiple times. The construction of the while loop is:

Loops are essential in programming to execute a block of code repeatedly. Java provides two commonly used loops: while and for.

1. while Loop: The while loop continues executing a block of code as long as a specified condition is true. Firstly, the condition is checked. While it’s true, the body of the loop (commands) is executed. If the condition is always true, the loop will repeat infinitely, and if the condition is false, the commands in a loop will never be executed.

In this example, the code inside the while loop will run repeatedly as long as count is less than or equal to 5.

2. for Loop: The for loop is used for iterating a specific number of times.

In this for loop, we initialize i to 1, specify the condition i <= 5, and increment i by 1 in each iteration. It will print "Count: 1" to "Count: 5."

Here are some Java coding challenges to practice the loops:

An array in Java is a data structure that allows you to store multiple values of the same type under a single variable name. It acts as a container for elements that can be accessed using an index.

What you should know about arrays in Java:

  • Indexing: Elements in an array are indexed, starting from 0. You can access elements by specifying their index in square brackets after the array name, like myArray[0] to access the first element.
  • Initialization: To use an array, you must declare and initialize it. You specify the array's type and its length. For example, to create an integer array that can hold five values: int[] myArray = new int[5];
  • Populating: After initialization, you can populate the array by assigning values to its elements. All elements should be of the same data type. For instance, myArray[0] = 10; myArray[1] = 20;.
  • Default Values: Arrays are initialized with default values. For objects, this is null, and for primitive types (int, double, boolean, etc.), it's typically 0, 0.0, or false.

In this example, we create an integer array, assign values to its elements, and access an element using indexing.

In Java, methods are like mini-programs within your main program. They are used to perform specific tasks, making your code more organized and manageable. Methods take a set of instructions and encapsulate them under a single name for easy reuse. Here's how you declare a method:

  • public is an access modifier that defines who can use the method. In this case, public means the method can be accessed from anywhere in your program.Read more about modifiers here .
  • static means the method belongs to the class itself, rather than an instance of the class. It's used for the main method, allowing it to run without creating an object.
  • void indicates that the method doesn't return any value. If it did, you would replace void with the data type of the returned value.

In this example, we have a main method (the entry point of the program) and a customMethod that we've defined. The main method calls customMethod, which prints a message. This illustrates how methods help organize and reuse code in Java, making it more efficient and readable.

In this example, we have a main method that calls the add method with two numbers (5 and 3). The add method calculates the sum and returns it. The result is then printed in the main method.

All composite types in Java consist of simpler ones, up until we end up with primitive types. An example of a primitive type is int, while String is a composite type that stores its data as a table of characters (primitive type char). Here are some examples of primitive types in Java:

  • int: Used for storing whole numbers (integers). Example: int age = 25;
  • double: Used for storing numbers with a decimal point. Example: double price = 19.99;
  • char: Used for storing single characters. Example: char grade = 'A';
  • boolean: Used for storing true or false values. Example: boolean isJavaFun = true;
  • String: Used for storing text (a sequence of characters). Example: String greeting = "Hello, World!";

Simple types are grouped into composite types, that are called classes. Example:

We declared a composite type Person and stored the data in a String (name) and int variable for an age of a person. Since composite types include many primitive types, they take up more memory than variables of the primitive types.

See the exercises for a coding practice in Java data types:

String is the most popular class in Java programs. Its objects are stored in a memory in a special way. The structure of this class is rather simple: there’s a character array (char array) inside, that stores all the characters of the string.

String class also has many helper classes to simplify working with strings in Java, and a lot of methods. Here’s what you can do while working with strings: compare them, search for substrings, and create new substrings.

Example of comparing strings using the equals() method.

Also you can check if a string contains a substring using the contains() method.

You can create a new substring from an existing string using the substring() method.

More information about the topic you could read here , here , here , here , and here .

Here are some Java programming exercises to practice the strings:

In Java, objects are instances of classes that you can create to represent and work with real-world entities or concepts. Here's how you can create objects:

First, you need to define a class that describes the properties and behaviors of your object. You can then create an object of that class using the new keyword like this:

It invokes the constructor of a class.If the constructor takes arguments, you can pass them within the parentheses. For example, to create an object of class Person with the name "Jane" and age 25, you would write:

Suppose you want to create a simple Person class with a name property and a sayHello method. Here's how you do it:

In this example, we defined a Person class with a name property and a sayHello method. We then created two Person objects (person1 and person2) and used them to represent individuals with different names.

Here are some coding challenges in Java object creation:

Static classes and methods in Java are used to create members that belong to the class itself, rather than to instances of the class. They can be accessed without creating an object of the class.

Static methods and classes are useful when you want to define utility methods or encapsulate related classes within a larger class without requiring an instance of the outer class. They are often used in various Java libraries and frameworks for organizing and providing utility functions.

You declare them with the static modifier.

Static Methods

A static method is a method that belongs to the class rather than any specific instance. You can call a static method using the class name, without creating an object of that class.

In this example, the add method is static. You can directly call it using Calculator.add(5, 3)

Static Classes

In Java, you can also have static nested classes, which are classes defined within another class and marked as static. These static nested classes can be accessed using the outer class's name.

In this example, Student is a static nested class within the School class. You can access it using School.Student.

More information about the topic you could read here , here , here , and here .

See below the exercises on Static classes and methods in our Java coding practice for beginners:

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Platform independence is one of the main reasons for Java's popularity. Java programmes can operate on a variety of computers as long as they have the Java Runtime Environment (JRE) installed. Another reason for java’s popularity can be that the code you wrote 15 years ago will execute on the most recent JVMs, benefiting from the latest profiling, native code translation, and memory management. In addition, Java is an object-oriented programming language Object-oriented programming is at the core of Java. Because Java objects don't refer to data outside of themselves, the code is extremely robust. Lastly, even though the language is considered basic, it comes with a library of classes that provide often used utility functions that most java projects require.

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