如：
cat.owner=woman;package zh.codegym.task.task02.task0213;
/*
宠物需要主人
*/
public class Solution {
public static void main(String[] args) {
Cat cat = new Cat();
Dog dog = new Dog();
Fish fish = new Fish();
Woman woman = new Woman();
woman=null;
cat.owner=woman;
dog.owner=woman;
fish.owner=woman;//在此编写你的代码
}
public static class Cat {
public Woman owner;
}
public static class Dog {
public Woman owner;
}
public static class Fish {
public Woman owner;
}
public static class Woman {
}
}