java 多线程死锁

/**
 * Created by root on 17-3-29.
 */
public class ThreadTest1 implements Runnable{
    A a=new A();
    B b=new B();

    public void run() {
        a.say(b);
    }

    public ThreadTest1(){
        new Thread(this).start();
        b.say(a);
    }
    public static void main(String[] args) {
        new Thread(new ThreadTest1()).start();
    }
}

class A {

    public synchronized void say(B b){
        System.out.println("A:给我B");
        b.get();
    }

    public synchronized void get(){
        System.out.println("A:得到B");
    }
}
class B {

    public synchronized void say(A a){
        System.out.println("B:给我A");
        a.get();
    }

    public synchronized void get(){
        System.out.println("B:得到A");
    }
}