import java.util.Random;
public class Main {
private static int r = 0;

public static void main(String[] args) {
    Random randomGenerator = new Random();


    while (r != 4) {     // repeat experiment until r be 4
        if (randomGenerator.nextInt(4) == 2) {
            r++;
            System.out.println("The Count Variable has changed to:" + r);

        }
        if (r == 4) {
            break;
        } else {
            System.out.println("Another unsuccessful trial has occurred, Count value is:  " + r);
        }
    }
}