program to print series of prime numbers using java

Question

This code is to print the series of prime number up to given limit but when I am trying to execute this,it goes into infinite loop.

import java.io.*;
class a
{
          


        

Answer 1

USe isPrime(int num) method in loop to generate prime numbers example is show below code

public class PrimeNumbersSeries 
{
    public boolean isPrime(int num)
    {
        boolean flag=true;
        for(int i=2; i<=num/2; i++)
        {
            if(num%i==0)
            {
                flag=false;
            }
            else 
           {
               flag=true;
           }
        }
        if(num<=1)
        {
            flag=false;
        }
        return flag;
    }
    public static void main(String []args)
    {
        System.out.println("how many prime no. do you want");
        PrimeNumbersSeries prime=new PrimeNumbersSeries();
        Scanner sc=new Scanner(System.in);
        int num=sc.nextInt();
        int count =0;
        int j=1;
        while(count!=num)
        {
            if(prime.isPrime(j))
            {
                System.out.print(j+", ");
                count++;
            }            
            j++;
       }
   }
}