java countdownlatch_java CountDownLatch 问题java.lang.IllegalMonitorStateException

publicclassCountDownLatchDemo_02{privatestaticfinalintTHREADS=5;publicstaticvoidmain(String[]args){finalCountDownLatchct=newCountDownLatch(THREADS);for(inti=0;i

public class CountDownLatchDemo_02 {

private static final int THREADS = 5;

public static void main(String[] args) {

final CountDownLatch ct = new CountDownLatch(THREADS);

for (int i = 0; i < THREADS; i++) {

new Thread() {

public void run() {

try {

Thread.sleep(1*1000);

System.out.println("--------------------done :"+Thread.currentThread().getId());

} catch (InterruptedException e) {

e.printStackTrace();

}

ct.countDown();

}

}.start();

}

new Thread(){

@Override

public void run() {

System.out.println("-------------------- start");

try {

ct.wait();

} catch (InterruptedException e) {

e.printStackTrace();

}

System.out.println("-------------------- finish");

}

}.start();

System.out.println("main exit---------");

}

}

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