该段代码来源于:http://www.cnblogs.com/GarfieldEr007/p/5746362.html
package com.multithread.wait;
public class MyThreadPrinter2 implements Runnable {
private String name;
private Object prev;
private Object self;
private MyThreadPrinter2(String name, Object prev, Object self) {
this.name = name;
this.prev = prev;
this.self = self;
}
@Override
public void run() {
int count = 10;
while (count > 0) {
synchronized (prev) {
synchronized (self) {
System.out.print(name);
count--;
self.notify();
}
try {
prev.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
public static void main(String[] args) throws Exception {
Object a = new Object();
Object b = new Object();
Object c = new Object();
MyThreadPrinter2 pa = new MyThreadPrinter2("A", c, a);
MyThreadPrinter2 pb = new MyThreadPrinter2("B", a, b);
MyThreadPrinter2 pc = new MyThreadPrinter2("C", b, c);
new Thread(pa).start();
Thread.sleep(100); //确保按顺序A、B、C执行
new Thread(pb).start();
Thread.sleep(100);
new Thread(pc).start();
Thread.sleep(100);
}
}
问题:
哪位大神能帮我梳理一下这段代码运行的过程啊。这个self.notify(); 究竟是谁被notify, 究竟notify了什么东西呢, notify之后发生了什么呢?
prev.wait(); 这里又是谁wait呢, 又wait了什么东西呢, wait后又发生了什么呢?
可以把 abc三个对象理解为三个锁,
a.wait 就是放弃a这个锁,进入线程等待状态
a.notify 就是唤醒一个需要a锁的处于线程等待状态的 线程,