Write a Program to Prints Prime Numbers using java

package topstechnology;import java.util.*;
public class primenumber {
    public static void main(String []args)
  {
    Scanner sc = new Scanner(System.in);
    int i,n,res;
    boolean flag=true;
    System.out.println("Enter the No.");
    n = sc.nextInt();
    for(i=2;i<=n/2;i++)
    {
        res = n%i;
        if(res==0)
        {
                flag =false;
                break;
        }
    }
    if(flag)
            System.out.println(n + " is Prime Number");
        else
            System.out.println(n + " is not Prime Number");
    }
}

OutPut