Java Programming Exercises, Practice, Solution

1. Write a Java program to print ‘Hello World!’ on screen

2. Write a Java program to print the sum of two numbers

3. Write a Java program that takes two numbers and display the product of two numbers

4. Write a Java program to print the sum, multiply, subtract, divide and remainder of two numbers

5. Write a Java program that takes five numbers as input to calculate and print the average of the numbers

6. Write a Java program to swap two variables

7. Write a Java program to convert a decimal number to binary numbers

8. Write a Java program to convert a binary number to decimal number

9. Write a Java program to check whether Java is installed on your computer or not

10. Write a Java program and compute the sum of the digits of an integer

11. Write a Java program to compare two numbers

12. Write a Java program to count the letters, spaces, numbers and other characters of an input string

13. Write a Java program to print the ascii value of a given character

14. Write a Java program that accepts an integer (n) and computes the value of n+nn+nnn

15. Write a Java program to display the system time

16. Write a Java program to print the odd numbers from 1 to 20

17. Write a Java program to print the even numbers from 1 to 20

18. Write a Java program to convert a string to an integer

19. Write a Java program to convert seconds to hour, minute and seconds

20. Write a Java program to compute the sum of the first 100 prime numbers

21. Write a Java program to swap the first and last elements of an array and create a new array

22. Write a Java program to count the number of even and odd elements in a given array

23. Write a Java program to compute the square root of an given integer

24. Write a Java program to check if a positive number is a palindrome or not

25. Write a Java program to add two numbers without using any arithmetic operators