这个程序产生了死锁，现在要用synchronized/wait(notify)和lock/await(signal)两种方式完成，求教

public class bank implements Runnable{

private static Object actors = new Object();
private static Object directors = new Object();
public int x;

public void run() {
System.out.println("进行转账");
if(x==1) {
synchronized(directors) {
System.out.println("演员开始转账");
try {
Thread.sleep(500);
}catch(Exception e) {
e.printStackTrace();
}
synchronized(actors) {
System.out.println("演员转账成功");
}
}
}
if(x==0) {
synchronized(actors) {
System.out.println("导演开始转账");
try {
Thread.sleep(500);
}catch(Exception e) {
e.printStackTrace();
}
synchronized(directors) {
System.out.println("导演转账成功");
}
}
}
}


public static void main(String[] args) {
bank actor =new bank();
bank director = new bank();

actor.x=1;
director.x=0;

new Thread(actor).start();
new Thread(director).start();
}
}