Java prime range

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package q1;
import java.util.Scanner;
public class q7 {
    public static void main(String[]args){
        int count=1, a1,a2,flag;
        Scanner keyboard = new Scanner(System.in);
        System.out.println("Enter first number:");
        a1=keyboard.nextInt();
        System.out.println("Enter first number:");
        a2=keyboard.nextInt();

        while(a1<=a2)
        {flag=1;

        for(count=2; count<a1;count++)
        {
            if (a1%count==0)
            {
                flag=0;
                break;
            }
        }
            if(flag==1)
                System.out.println(a1+" ");
            a1++;

        }
}
}