编写一个程序，开启3个线程，这3个线程的ID分别为A、B、C，每个线程将自己的ID在屏幕上打印10遍，要求输出结果必须按ABC的顺序显示；如：ABCABC….依次递推。

编写一个程序，开启3个线程，这3个线程的ID分别为A、B、C，每个线程将自己的ID在屏幕上打印10遍，要求输出结果必须按ABC的顺序显示；如：ABCABC….依次递推。

package com.ry.test;

public class Test02 {
//ABC  ABC    ABC    ABC    ABC    ABC    ABC    ABC    ABC    ABC
public static void main(String[] args) {
Thread t1 = new Thread(new runnable2(1, "A"));
Thread t2 = new Thread(new runnable2(2, "B"));
Thread t3 = new Thread(new runnable2(0, "C"));
t1.start();
t2.start();
t3.start();
}
}

class runnable2 implements Runnable {
private int sign;//标记
private String csign;
static private int count = 1;//记录次数

public runnable2(int sign, String csign) {
this.sign = sign;
this.csign = csign;
}

@Override
public void run() {
while (count <= 30) {
synchronized (runnable2.class) {
if (count % 3 == sign) {
if (count % 3 == 1) {
System.out.print("\t" + (count / 3+1));
}
System.out.print(csign);
count++;
runnable2.class.notifyAll();
} else {
try {
runnable2.class.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
}
}