我无法弄清楚以下代码中的问题：
我有一个可以暂停和恢复的线程
代码如下：
public class CustomThread implements Runnable {
private volatile boolean stop;
private volatile boolean suspend;
String[] names = new String[]{
"A", "B","C","D","E", "F", "G","H","I","J","K", "L"
};
public CustomThread(){
Collections.shuffle(Arrays.asList(names));
System.out.println("Available names:");
System.out.println(Arrays.asList(names));
}
@Override
public void run() {
while(!stop){
synchronized (this) {
if(suspend){
try {
System.out.println("Got suspended");
wait();
System.out.println("Resumed");
} catch (InterruptedException e) {
System.out.println("Got interupted");
}
}
else System.out.println("Suspend false");
}
int randomIdx = new Random().nextInt(names.length);
System.out.println(names[randomIdx]);
}
}
public synchronized void suspend(){
System.out.println(">>>>>>>>>>>>>>>>>>>>>>>>>>>Suspend true");
suspend = true;
}
public synchronized void resume(){
suspend = false;
notify();
}
}
我运行以下简单代码：
public class CustomTest {
/**
* @param args
* @throws InterruptedException
*/
public static void main(String[] args) throws InterruptedException {
CustomThread c = new CustomThread();
Thread t = new Thread(c);
t.start();
Thread.sleep(5000);
System.out.println("++++++++++++++++++++++++++++++++");
c.suspend();
}
}
我期望看到的是：
线程自定义运行，主线程休眠，主线程暂停自定义线程，c.suspend()并且由于main终止并且没有人恢复线程，线程保持在wait状态。
但我看到的是CustomThread连续打印Suspend false和来自names.
这里有什么问题？就像Thread.sleep(5000)and c.suspend()in main 什么都不做。