Print prime numbers in java

Print prime numbers

Prime numbers can divisible by 1 and itself only.

import java.util.Scanner;

public class PrimeNumbers {

    public static void main(String[] arg){

        int number;

        Scanner sc=new Scanner(System.in);

        System.out.println("Enter number :");

        number=sc.nextInt();              

        System.out.println("Prime numbers from 1 to " + number);

        for(int i=1;i<=number;i++){             

              boolean isPrime = true;

              //to check it is prime or not

              for(int j=2;j<i;j++){

                    if(i%j==0){

                       isPrime = false;

                       break;

                      }

                 }                       

                       if(isPrime)

                          System.out.print(i + " ");

           }       

    }

}

/*

Output:

Enter number :

20

Prime numbers from 1 to 20

1 2 3 5 7 11 13 17 19

*/