problem with java code

[Vinnibabu singu]

Hello everyone,
I wanted to writte a program to print prime numbers between two given numbers.
The range of numbers should be given through command prompt.
like if we give

> java primeno 4 20

it should display the prime numbers between 4 and 20

I wrote the following code for it

  class primeno
{
 public static void main(String args[])
{
  int n1=Integer.parseInt(args[0]);
  int n2=Integer.parseInt(args[1]);
  prime(n1,n2);
}
static void prime(int n1,int n2)
{
 boolean flag=true;
 for(int j=n1;j<=n2;j++)
{
 for(int i=2;i<j;i++)
{
 if(j%i==0)
{
 flag=false;
 break;
}//if
}//for
if(flag)
{
System.out.println(j);
}
}//for
}//method
}//class  

no numbers are being displayed.
please tell me where the problem is and correct it.
thank you

[Rob Spoor]

First of all, please add some indentation. It's not easy to read this way.

Your flag will remain false if it even one number is not a prime, because the only place you set it to true is at the very start of the method. You should set it to true for each number you want to test; just move the declaration inside the first for-loop.

[Vinnibabu singu]

thank you very much