Question

java中，怎么让两个对象互相持有对方的引用

Answer 1

class Producer
{
private Consumer c = null;
Producer(Consumer c)
{
this.c = c;
c.firstMethod(); //持有对方引用
}

public void secondMethod()
{
System.out.println("Producer.");
}

}

class Consumer
{
private Producer p = null;
Consumer(Producer p)
{
this.p = p;
p.secondMethod(); //持有对方引用
}

public void firstMethod()
{
System.out.println("Consumer.");
}

}