Map拷贝 关于对象深拷贝 浅拷贝的问题

关于Map的深拷贝，并不是说，用了putAll就能搞定，不多说，直接上代码：

{key1=3}
{key1=3}
--------------------------------------------------------------
{key1=3}
{key1=1}
--------------------------------------------------------------
{key1=Dog{name="Dog1"}}
{key1=Dog{name="dog3"}}
--------------------------------------------------------------
{key5=Dog{name="Dog5"}}
{key5=Dog{name="Dog5"}}

public class CopyMap {
    public static void main(String[] args) {
        Map<String, Integer> map11 = new HashMap<String, Integer>();
        map11.put("key1", 1);
        Map<String, Integer> map22 = map11;
        map11.put("key1", 3);
        System.out.println(map11);
        System.out.println(map22);
        System.out.println("--------------------------------------------------------------");





        Map<String, Integer> map1 = new HashMap<String, Integer>();
        map1.put("key1", 1);
        Map<String, Integer> map2 = new HashMap<String, Integer>();
        map2.putAll(map1);
        map1.put("key1", 3);
        System.out.println(map1);
        System.out.println(map2);
        System.out.println("--------------------------------------------------------------");


        Map<String, Dog> map3 = new HashMap<String, Dog>();
        Dog dog1 = new Dog("Dog1");
        map3.put("key1", dog1);
        Map<String, Dog> map4 = new HashMap<String, Dog>();
        map4.putAll(map3);
        System.out.println(map4);
        map3.get("key1").setName("dog3");
        System.out.println(map4);
        System.out.println("--------------------------------------------------------------");


        Map<String, Dog> map5 = new HashMap<String, Dog>();
        Dog dog5 = new Dog("Dog5");
        map5.put("key5", dog5);
        Map<String, Dog> map6 = (Map<String, Dog>) deepClone(map5);
        System.out.println(map6);
        map5.get("key5").setName("Dog7");
        System.out.println(map6);
    }

    public static Object deepClone(Object obj) {
        try {// 将对象写到流里
            ByteArrayOutputStream bo = new ByteArrayOutputStream();
            ObjectOutputStream oo = new ObjectOutputStream(bo);
            oo.writeObject(obj);// 从流里读出来
            ByteArrayInputStream bi = new ByteArrayInputStream(bo.toByteArray());
            ObjectInputStream oi = new ObjectInputStream(bi);
            return (oi.readObject());
        } catch (Exception e) {
            return null;
        }
    }

}

class Dog implements Serializable {
    private String name;

    public Dog(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    @Override public String toString() {
        return "Dog{" + "name="" + name + """ + "}";
    }
}