public class DeadLock implements Runnable{
    public static void main(String[] args) throws Exception{
        new DeadLock();
    }
    A a=new A();
    B b=new B();
    public DeadLock() throws Exception{ 
        Thread.currentThread().setName("MainThread");
        new Thread(this).start();//a new Thread
//        Thread.sleep(1000);
        a.foo(b); //MainThread Thread
        System.out.println("back to main hread"); //never executed
    }
    public void run(){
        Thread.currentThread().setName("OtherThread");
        b.bar(a); 
        System.out.println("back to other thread");
    }
}

class A{
    String name; //问题在这,我知道该句应该在foo()里面,为什么下面打印的name都是main?
    synchronized void foo(B b){
        name =Thread.currentThread().getName(); //每次调用的时候获取当前线程
        System.out.println(name+" enter A.foo()");
        try{
            Thread.sleep(100);
        }
        catch(InterruptedException e){
            System.out.println(e.getMessage());
        }
        System.out.println(name+" trying to call A.last()");
        b.last();
    }
    synchronized void last(){ 
        System.out.println("inside A.last()");
    }
}

class B{
//    String name=Thread.currentThread().getName();//问题在这,我知道该句应该在foo()里面,为什么下面打印的name都是main?
    String name;
    synchronized void bar(A a){

        name =Thread.currentThread().getName();
        System.out.println(name+" enter B.bar()");
        try{
            Thread.sleep(100);
        }
        catch(InterruptedException e){
            System.out.println(e.getMessage());
        }
        System.out.println(name+" trying to call B.last()");
        a.last();
    }
    synchronized void last(){ 
        System.out.println("inside B.last()");
    }
}