线程的有关问题，为什么运行完后线程没有自动关闭

线程的问题，为什么运行完后线程没有自动关闭
package thread;

public class ThreadPrint {

public static void main(String[] args) {
String lock="lock";
Thread t1= new Thread(new Thread1(lock));
t1.start();
Thread t2= new Thread(new Thread2(lock));
t2.start();
}

}

class Thread1 implements Runnable{
String lock;

public Thread1(String lock) {
this.lock = lock;
}

@Override
public void run() {
synchronized (lock) {
for(int i = 1;i<53;i++){
System.out.println("The first thread.-->"+i);
if(i%2==0){
try {
lock.notify();
lock.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
}

}

class Thread2 implements Runnable{
String lock;

public Thread2(String lock) {
this.lock = lock;
}

@Override
public void run() {
synchronized (lock) {
for(char i = 'A';i<'Z';i++){
try {
System.out.println("The second thread.-->"+i);
lock.notify();
lock.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}

}

}



[解决办法]
你可以亲手杀死进程，比如

Java code

public class ThreadPrint {    public static void main(String[] args) throws Exception {    String lock = "lock";    Thread t1 = new Thread(new Thread1(lock));    t1.start();    Thread.sleep(1000);    t1.stop();    Thread t2 = new Thread(new Thread2(lock));    t2.start();    Thread.sleep(1000);    t2.stop();    }}class Thread1 implements Runnable {    String lock;    public Thread1(String lock) {    this.lock = lock;    }    public void run() {    synchronized (lock) {        for (int i = 1; i < 53; i++) {        System.out.println("The first thread.-->" + i);        if (i % 2 == 0) {            try {            lock.notify();            lock.wait();                        } catch (InterruptedException e) {            e.printStackTrace();            }        }        }    }    }}class Thread2 implements Runnable {    String lock;    public Thread2(String lock) {    this.lock = lock;    }    public void run() {    synchronized (lock) {        for (char i = 'A'; i < 'Z'; i++) {        try {            System.out.println("The second thread.-->" + i);            lock.notify();            lock.wait();        } catch (InterruptedException e) {            e.printStackTrace();        }        }    }    }}
[解决办法]
Thread-0:0
Thread-1:A
Thread-0:1
Thread-0:2
Thread-1:B
Thread-0:3
Thread-0:4
Thread-1:C
Thread-0:5
Thread-0:6
Thread-1:D
Thread-0:7
Thread-0:8
Thread-1:E
Thread-0:9
Thread-0:10
Thread-1:F
Thread-0:11
Thread-0:12
Thread-1:G
Thread-0:13
Thread-0:14
Thread-1:H
Thread-0:15
Thread-0:16
Thread-1:I
Thread-0:17
Thread-0:18
Thread-1:J
Thread-0:19
Thread-0:20
Thread-1:K
Thread-0:21
Thread-0:22
Thread-1:L
Thread-0:23
Thread-0:24
Thread-1:M
Thread-0:25
Thread-0:26
Thread-1:N
Thread-0:27
Thread-0:28
Thread-1:O
Thread-0:29

从运行的结果可以知道，在Thread1 运行到30的时候，不会进入到循环了。但是，你并没有释放lock锁，而Thread2还在等待lock锁，这样就导致了，线程一直等待了。注：当调用wait()方法后，只有调用了notify()方法后才会释放锁的