多线程 ： 使用 wait 和 notify 实现进程间同步通信

public class S03 {

	private boolean isSub = true;

	public synchronized void sub() throws InterruptedException {
		if (!isSub) {
			this.wait();
		}
		// do something
		isSub = !isSub;
		this.notify();
	}

	public synchronized void main() throws InterruptedException {
		if (isSub) {
			this.wait();
		}
		// do something
		isSub = !isSub;
		this.notify();
	}
}