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1 wait和notify
当调用wait()方法时线程会放弃对象锁，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
Object的方法：void notify(): 唤醒一个正在等待该对象的线程。void notifyAll(): 唤醒所有正在等待该对象的线程。notifyAll使所有原来在该对象上等待被notify的线程统统退出wait状态，变成等待该对象上的锁，一旦该对象被解锁，它们会去竞争。notify只是选择一个wait状态线程进行通知，并使它获得该对象上的锁，但不惊动其它同样在等待被该对象notify的线程们，当第一个线程运行完毕以后释放对象上的锁，此时如果该对象没有再次使用notify语句，即便该对象已经空闲，其他wait状态等待的线程由于没有得到该对象的通知，继续处在wait状态，直到这个对象发出一个notify或notifyAll，它们等待的是被notify或notifyAll，而不是锁。
2 wait和notify实例
子线程循环10次，主线程循环100次。接着子线程循环10次，主线程循环100次。如此循环50次。摘自张孝祥老师线程视频源码。
public class TraditionalThreadCommunication{ public static void main(String[] args) { final Business business = new Business(); new Thread(new Runnable() { public void run() { for (int i = 1; i <= 50; i++) { business.sub(i); } } }).start(); for (int i = 1; i <= 50; i++) { business.main(i); } }}class Business{ private boolean bShouldSub= true; public synchronized void sub(int i) { while (!bShouldSub) { try { this.wait(); } catch (InterruptedException e) { e.printStackTrace(); } } for (int j = 1; j <= 10; j++) { System.out.println("sub thread sequence of " + j + ",loop of " + i); } bShouldSub = false; this.notify(); } public synchronizedvoid main(int i) { while (bShouldSub) { try { this.wait(); } catch (InterruptedException e) { e.printStackTrace(); } } for (int j = 1; j <= 100; j++) { System.out.println("main thread sequence of " + j + ",loop of " + i); } bShouldSub = true; this.notify(); }}
3 Condition实例
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