JAVA 集合的嵌套

■TestNest.java -> 测试嵌套.java

import java.util.ArrayList;
import java.util.List;

class Cat {
    public String name;
}

public class TestNest {

    public static void main(String[] args) {
        Cat c = new Cat();
        Cat c2 = new Cat();
        Cat c3 = new Cat();

        c.name = "Ashley";

        List<Cat> cat = new ArrayList<Cat>();
        cat.add(c);
        cat.add(c2);
        cat.add(c3);
        c.name = "Sharrey";
        c2.name = "Monique";
        c3.name = "Choo";
        System.out.println(cat.get(0).name);
        System.out.println(cat.get(1).name);
        System.out.println(cat.get(2).name);

    }

}

■TestNest.java
莎瑞
莫尼克
周

■Main.java的主要内容

import java.util.ArrayList;
import java.util.List;

class Hero {
    public String name;
}

public class Main {
    public static void main(String[] args) {
        Hero h = new Hero();
        Hero h2 = new Hero();
        h.name = "ミナト";
        List<Hero> a = new ArrayList<Hero>();
        a.add(h);
        a.add(h2);
        h.name = "スガワラ";
        h2.name = "ネコ";
        System.out.println(a.get(0).name);
        System.out.println(a.get(1).name);

    }

}

Main.java的执行结果是：スガワラ\nネコ。