不死的小三儿：关于死锁的问题

public class Lock1 extends Thread {
    private String str1;
    private String str2;
   
    public Lock1(String str1,String str2) {
        super();
        this.str1 = str1;
        this.str2 = str2;
    }

    public void run(){
        synchronized(str1){
            System.out.println();
            System.out.println(this.getName()+":"+"人质"+str1+"在我手上！把钱拿过来!记得别报警！！"+str2+"万！一分都不能少！");
            System.out.println("不给钱就撕票！！！");
            if(Police.rdm()==0){
                System.out.println();
                System.out.println(this.getName()+":"+"你敢报警!!撕票！啊！我死啦~~~");
                System.out.println("旁白："+str1+"被警察叔叔救了！");
           
               
                    try {
                        this.wait();
                    } catch (InterruptedException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                  
               
           
            }
            synchronized(str2){
//                    this.notify();
                System.out.println();
                System.out.println(this.getName()+":"+"钱以拿到，放人！");
            }
        }
    }
}

public class Lock2 extends Thread {
    private String str1;
    private String str2;
   
    public Lock2(String str1,String str2) {
        super();
        this.str1 = str1;
        this.str2 = str2;
    }
    public void pay(){
      
    }
    public void run(){
        synchronized (str2) {
            System.out.println();
            System.out.println(this.getName()+":"+str2+"万，我准备好了！放人！");
            System.out.println("再不放人就报警了！");
            if(Police.rdm()==1){
                System.out.println();
                System.out.println(this.getName()+":"+"我真的没有报警啊！给你双倍钱！把人放了把");
           
               
                    try {
                        this.wait();
                    } catch (InterruptedException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
               
            }
           
            synchronized (str1) {
                System.out.println();
                System.out.println(this.getName()+":"+"钱没啦，人回来！悲剧啊！");
            }
        }
    }
}

public class Police {
    public static int rdm(){
        double r=Math.random()*10;
        int rd=0;
      
        if(r<5){
            rd=0;
        }else {
            rd=1;
        }
        return rd;
    }


}public class LockTest {
    public static void main(String[] args) {
        Lock1 l1=new Lock1("三儿","1");
        Lock2 l2=new Lock2("三儿","1");
        l1.setName("劫匪");
        l2.setName("被害者");
      
        l1.start();
        l2.start();
      
    }

}