Java 多线程 死锁Demo

package com.cfd.thread;

/**
 *  死锁
 * @author cfd
 *
 */

class DLockThread extends Thread{
	static Object a = new Object();
	static Object b = new Object();
	String firstObj = "";
	public DLockThread(String firstObj, String threadName){
		this.firstObj = firstObj;
		super.setName(threadName);
	}
	
	public void run() {
		while(true)
		if("a".equals(firstObj)){
			synchronized(a){//获取对象a的锁，然后去获取对象b的锁
				System.out.println(Thread.currentThread().getName()+"--->"+a.toString());
				synchronized(b){
					System.out.println(Thread.currentThread().getName()+"--->"+b.toString());
				}
			}
		}else if("b".equals(firstObj)) {
			synchronized(b){
				System.out.println(Thread.currentThread().getName()+"--->"+b.toString());
				synchronized(a){
					System.out.println(Thread.currentThread().getName()+"--->"+a.toString());
				}
			}
		}
	}
}

public class DLockThreadTest{
	public static void main(String[] args) {
		DLockThread t1 = new DLockThread("a", "t1");
		DLockThread t2 = new DLockThread("b", "t2");
		t1.start();
		t2.start();
	}
}