这段代码实现不了死锁吗？

Java code

public class Deadlock {    private String a="";    private String b="";    private int n=1;        public void write(){        synchronized (a) {              try {                Thread.sleep(500);            } catch (InterruptedException e) {                // TODO Auto-generated catch block                e.printStackTrace();            }            synchronized (b) {                                System.out.println("第" +                        n+"次被写入");                n++;                                            }                    }    }    public void read(){        synchronized (b) {            try {                Thread.sleep(500);            } catch (InterruptedException e) {                // TODO Auto-generated catch block                e.printStackTrace();            }            synchronized (a) {                System.out.println("第" +                        n+"次被读取");                n++;                            }                    }    }

Java code

public class MyDeadlock implements Runnable{    private Deadlock dl;    public MyDeadlock(Deadlock dl) {        this.dl = dl;    }    @Override    public void run() {        for(int i=0;i<100;i++){            dl.write();                dl.read();        }    }    

Java code

public class TestDeadlock {    public static void main(String[] args) {        Deadlock deadlock=new Deadlock();        MyDeadlock md=new MyDeadlock(deadlock);        Thread t1=new Thread(md);        Thread t2=new Thread(md);        t1.start();        try {            Thread.sleep(500);        } catch (InterruptedException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }        t2.start();        try {            Thread.sleep(500);        } catch (InterruptedException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }            }

能sleep的地方都sleep了，就是不死锁，是不是什么地方有问题？

[解决办法]
死锁是a占用b资源，b又占用a资源。先理解死锁的概念吧

Java code

package com.zzx.study.thread;public class TestDeadLock implements Runnable {    public int flag = 1;    static Object o1 = new Object(), o2 = new Object();    public void run() {System.out.println("flag=" + flag);        if(flag == 1) {            synchronized(o1) {                try {                    Thread.sleep(500);                } catch (Exception e) {                    e.printStackTrace();                }                synchronized(o2) {                    System.out.println("1");                    }            }        }        if(flag == 0) {            synchronized(o2) {                try {                    Thread.sleep(500);                } catch (Exception e) {                    e.printStackTrace();                }                synchronized(o1) {                    System.out.println("0");                }            }        }    }            public static void main(String[] args) {        TestDeadLock td1 = new TestDeadLock();        TestDeadLock td2 = new TestDeadLock();        td1.flag = 1;        td2.flag = 0;        Thread t1 = new Thread(td1);        Thread t2 = new Thread(td2);        t1.start();        t2.start();            }}