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Java Exercises – Basic to Advanced Java Practice Set with Solutions

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Take a look at our 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.

This Java exercise provides you with 30+ exercise questions with solutions to resolve any doubts. Solving these Java exercise questions will help you to practice Java programming and become a better Java programmer.

Java-Exercises

Java Exercise Questions

1. Write Hello World Program in Java

The solution to the Problem is mentioned below:

Java

// Java Program to Print
// Hello World
import java.io.*;
  
// Driver Class
class GFG {
    // main function
    public static void main(String[] args)
    {
  
        // Printing Hello World
        System.out.println("Hello World!");
    }
}

                    

Output
Hello World!



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

Input: 2 3
Output: 5

Click Here for the Solution

3. Write a Program to Swap Two Numbers

Input: a=2  b=5
Output: a=5 b=2

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4. Write a Java Program to convert Integer numbers and Binary numbers.

Input: 9 
Output: 1001

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5. Write a Program to Find Factorial of a Number in Java.

Input: 5
Output: 120

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6. Write a Java Program to Add two Complex Numbers.

Input:   1+2i
4+5i
Output: 5+7i

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7. Write a Program to Calculate Simple Interest in Java

Input :  P = 10000  R = 5  T = 5
Output : 2500

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8. Write a Program to Print the Pascal’s Triangle in Java

Input : N = 5
Output:
1
1 1
1 2 1
1 3 3 1
1 4 6 4 1
1 5 10 10 5 1

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9. Write a Program to Find Sum of Fibonacci Series Number

Input: n = 4
Output: 33
Explaination: Sum of numbers at even indexes = 0 + 1 + 3 + 8 + 21 = 33.

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Pattern Questions in Java

Java Pattern Exercises


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

    *
***
*****
*******

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11. Write a Java Program to Print Pattern.

* * * * * * 
* *
* *
* *
* *
* * * * * *

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12. Write a Java Program to Print Pattern.

          1 
2 1 2
3 2 1 2 3
4 3 2 1 2 3 4
5 4 3 2 1 2 3 4 5
6 5 4 3 2 1 2 3 4 5 6

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13. Java Program to Print Patterns.

     *
***
*****
*******
*********
***********
*********
*******
*****
***
*

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Array in Java

Java-Array Programs

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

Input: [ 2, 4, 6, 7, 9]
Output: 28

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15. Write a Java Program to Find the Largest Element in Array

Input: [ 7, 2, 5, 1, 4]
Output: 7

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16. Write Java Program to Find the Tranpose of Matrix

Input: 
[ [ 1, 2, 3 ]
[ 4, 5, 6 ]
[ 7, 8, 9 ] ]
Output:
[ [ 1, 4, 7]
[ 2, 5, 8]
[ 3, 6, 9] ]

Click Here for the Solution

17. Java Array Program For Array Rotation

Input: arr[] = {1, 2, 3, 4, 5, 6, 7},  d = 2
Output:  3 4 5 6 7 1 2
Explaination: d=2 so 2 elements are rotated to the end of the array. So, 1 2 is rotated back
So, Final result: 3, 4, 5, 6, 7, 1, 2

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18. Java Array Program to Remove Duplicate Elements From an Array

Input: [ 1, 2, 2, 3, 3, 3, 4, 5 ]
Output: [ 1, 2, 3, 4, 5 ]

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19. Java Array Program to Remove All Occurrences of an Element in an Array

Input: array = [ 1, 2, 1, 3, 5, 1 ] , key = 1
Output: [2, 3, 5]
Explaination: all the occurrences of element 1 is removed from the array So, array becomes from
[ 1, 2, 1, 3, 5, 1 ] to
Final result: [2, 3, 5]

Click Here for the Solution

String in Java

Java-String Programs

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

Input: "racecar"
Output: Yes
Explaination: As racerar after reversing becomes racecar. As Reverse of String is same as String so it is Palindrome

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21. Java String Program to Check Anagram

Input: str1 = "Silent"
str2 ="Listen"
Output: Strings are Anagram
Explaination: As all the elements in str1 are exact same as to create str2 .
i.e., we can create str2 using elements of str1 without removing any element or removing any extra element.

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22. Java String Program to Reverse a String

Input: str= "Geeks"
Output: "skeeG"

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23. Java String Program to Remove leading zeros

Input : 00000123569
Output : 123569

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Searching Algorithms in Java

Searching Algorithms Problem

24. Write a Java Program for Linear Search.

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

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25. Write a Binary Search Program in Java.

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

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Sorting Algorithms

Sorting Algorithms in Java

26. Java Program for Bubble Sort.

Time Complexity: O(N2)
Space Complexity: O(1)

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27. Write a Program for Insertion Sort in Java.

Time Complexity: O(N2)
Space Complexity: O(1)

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28. Java Program for Selection Sort.

Time Complexity: O(N2)
Space Complexity: O(1)

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29. Java Program for Merge Sort.

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

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30. Java Program for QuickSort.

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

Click Here for the Solution


Conslusion

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.

FAQ in Java Exercise

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


Last Updated : 19 Feb, 2024
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