夜深了，快睡吧-sleep()和wait()区别
2018-07-30 本文已影响72人
一个喜欢烧砖的人
sleep():
- 属于Thread类
- sleep()方法导致了程序暂停执行指定的时间，让出cpu去其他线程，但是他的监控状态依然保持者，当指定的时间到了又会自动恢复运行状态
- 在调用sleep()方法的过程中，线程不会释放对象锁
wait():
- 属于object的方法
- 调用wait()方法的时候，线程会放弃对象锁，进入等待此对象的等待锁定池，只有针对此对象调用notify()方法后本线程才进入对象锁定池准备
废话不多说，直接撸代码
public class mySleepTest {
public static void main(String[] args) {
new Thread(new Thread1()).start();
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
e.printStackTrace();
}
new Thread(new Thread2()).start();
}
public static class Thread1 implements Runnable {
public void run() {
synchronized (mySleepTest.class) {
System.out.println("enter thread 1 .....");
System.out.println("thread1 is wairting....");
try {
mySleepTest.class.wait();
} catch (Exception e) {
}
System.out.println("thread1 is going on ...");
System.out.println("thread1 is over");
}
}
}
public static class Thread2 implements Runnable {
public void run() {
synchronized (mySleepTest.class) {
System.out.println("enter thread 2 ...");
System.out.println("thread 2 is sleeping ...");
mySleepTest.class.notify();
try {
Thread.sleep(5000);
} catch (Exception e) {
}
System.out.println("thread 2 is going on ...");
System.out.println("thread 2 is over ...");
}
}
}
}
运行结果
enter thread 1 .....
thread1 is wairting....
enter thread 2 ...
thread 2 is sleeping ...
thread 2 is going on ...
thread 2 is over ...
thread1 is going on ...
thread1 is over
Process finished with exit code 0
注释掉 mySleepTest.class.notify();
运行结果：
enter thread 1 .....
thread1 is wairting....
enter thread 2 ...
thread 2 is sleeping ...
thread 2 is going on ...
thread 2 is over ...
（程序一直停在此处....）
