Write a Java program to check whether the number is a prime number or not


Introduction

In this demo I have used NetBeans IDE 8.2 for debugging purpose. But you can use any java programming language compiler as per your availability..


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  1. import java.util.Scanner;
  2.  
  3. public class JavaLoopExcercise
  4. {
  5. public static void main(String[] args)
  6. {
  7. Scanner console = new Scanner(System.in);
  8.  
  9. int number;
  10.  
  11. System.out.print("Enter the positive integer ");
  12. number = console.nextInt();
  13.  
  14. boolean flag = true;
  15.  
  16. for(int i = 2; i < number; i++)
  17. {
  18. if(number % i == 0)
  19. {
  20. flag = false;
  21. break;
  22. }
  23. }
  24.  
  25. if(flag && number > 1)
  26. {
  27. System.out.println("Number is prime");
  28. }
  29. else
  30. {
  31. System.out.println("Number is not prime");
  32. }
  33.  
  34. }
  35. }

Result

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