waituntilmultithreadexit.java

基于位运算的求解NQueen问题的一个实例。 提供了基于单线程和多线程两种方式计算的代码

package org.freethink.tools.thread;

public class WaitUntilMultiThreadExit {
	Object lock = new Object();
	int activeCount = 0;
	
	public void waiting() {
		try {
			synchronized (lock) {
				lock.wait();
			}
		} catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	public synchronized void notifyWaiterToWait() {
		activeCount++;
	}
	
	public synchronized void notifyWaiterToRun() {
		if (--activeCount == 0) {
			synchronized(lock) {
				lock.notify();
			}
		}
	}
}