多线程 死锁的产生与避免

package thread03;

/**
 * 死锁 ： 过多的同步可能造成相互不释放资源
 * 从而互相等待，一般发生于同步中持有多个对象的锁
 * 
 * 避免：不要在同一个代码块中，同时持有多个对象的锁
 * 
 * @author 
 *
 */
public class TestDeadLock {
	public static void main(String[] args) {
		Markup g1 = new Markup(1, "a");
		Markup g2 = new Markup(0, "b");
		g1.start();
		g2.start();
	}
}

//口红
class Lipstick{
	
}

//镜子
class Mirror{
	
}

//化妆
class Markup extends Thread{
	static Lipstick lipstick = new Lipstick();
	static Mirror mirror = new Mirror();
	
	//选择
	int choice;
	//名字
	String girl;
	
	public Markup(int choice, String girl) {
		super();
		this.choice = choice;
		this.girl = girl;
	}


	@Override
	public void run() {
		//化妆
		try {
			makeup();
		} catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	//相互持有对方的对象锁-->可能造成死锁
	private void makeup() throws InterruptedException {
		if(choice == 0) {
			synchronized(lipstick) {//获得口红的锁
				System.out.println(this.girl+"涂口红");
				//一秒后想拥有镜子
				Thread.sleep(1000);
				
				/*synchronized (mirror) {//获得镜子
					System.out.println(this.girl+"照镜子");
				}*/
			}
			synchronized (mirror) {//获得镜子
				System.out.println(this.girl+"照镜子");
			}
			
		}else{
			synchronized (mirror) {//获得镜子的锁
				System.out.println(this.girl+"照镜子");
				//两秒后想拥有口红的锁
				Thread.sleep(2000);
				
				/*synchronized(lipstick) {
					System.out.println(this.girl+"涂口红");
				}*/
			}
			synchronized(lipstick) {
				System.out.println(this.girl+"涂口红");
			}
		}
	}
}