java 多线程控制线程执行顺序

之前遇到过这个问题，直接上代码记录下：

public class RunableTest implements Runnable {

volatile int target="A".codePointAt(0);
static int minOrder="A".codePointAt(0);
static int maxOrder="C".codePointAt(0);

@Override
public void run() {
synchronized (this){
int order=Thread.currentThread().getName().codePointAt(0);
for (int i=0;i<10;i++){
while (target!=order){
try{
wait();
}catch (Exception ex){

}
}
System.out.println(Thread.currentThread().getName());
target=order+1;
if(target>maxOrder){
target=minOrder;
}
notifyAll();
}

}

}
}

public class TestMain {

public static void main(String[] args){

Runnable runnable=new RunableTest();

Thread threadA=new Thread(runnable,"A");
Thread threadB=new Thread(runnable,"B");
Thread threadC=new Thread(runnable,"C");

threadA.start();
threadB.start();
threadC.start();

}
}

执行结果
A

B

C

A

B

C

A

B

C

A

B

C

A

B

C

A

B

C

A

B

C

A

B

C

A

B

C

A

B

C