从随机发生器打印偶数

import java.util.*;
public class Exam2_2 {
    public static void main(String[]args) {
        Random rand = new Random();
        int roll = 0;
        int roll2 = 0;
        int tries = 0;

        while((roll % 2 == 0) && (roll2 % 2 == 0)) {
            roll = rand.nextInt(8) + 1;
            roll2 = rand.nextInt(8) + 1;
            System.out.println("(" + roll + ", " + roll2 + ")");
            tries++;
        } 
        System.out.println("you won after " + tries + " tries");
    }
}
import java.util.*;
public class Exam2_2 {