Object 类中的 clone 方法应该是 shallow 拷贝 那应该是 p1 p2 指向同一个对象 为什么我实际使用的时候却不对?

测试类

public class TestCopy { public static void main(String[] args) throws CloneNotSupportedException { Person p1 = new Person("张三", 18, new Address("江苏省", "无锡市")); System.out.println(p1); //Person{pname='张三', page=18, addr=Address{province='江苏省', city='无锡市'}} Person p2 = (Person) p1.clone(); System.out.println(p1 + " \n" + p2); //Person{pname='张三', page=18, addr=Address{province='江苏省', city='无锡市'}} //Person{pname='张三', page=18, addr=Address{province='江苏省', city='无锡市'}} System.out.println(p1.equals(p2)); //false Address addr2 = new Address("江苏省", "苏州市"); p2.setAddr(addr2); System.out.println("修改地址后==========================================="); System.out.println(p1); System.out.println(p2); //Person{pname='张三', page=18, addr=Address{province='江苏省', city='无锡市'}} //Person{pname='张三', page=18, addr=Address{province='江苏省', city='苏州市'}} } } 

源码注释也写的很清楚 Thus, this method performs a "shallow copy" of this object, not a "deep copy" operation. 

public class Person implements Cloneable{ private String pname; private int page; private Address addr; public Person() { } public Person(String pname, int page, Address addr) { this.pname = pname; this.page = page; this.addr = addr; } @Override public String toString() { return "Person{" + "pname='" + pname + '\'' + ", page=" + page + ", addr=" + addr + '}'; } public void showAll(){ System.out.println("名字是:" + this.pname + ",年龄是:" + page + ",地址(省+市)是:" + addr.getProvince() + addr.getCity()); } @Override protected Object clone() throws CloneNotSupportedException { return super.clone(); } public String getPname() { return pname; } public void setPname(String pname) { this.pname = pname; } public int getPage() { return page; } public void setPage(int page) { this.page = page; } public Address getAddr() { return addr; } public void setAddr(Address addr) { this.addr = addr; } } public class Address{ private String province; private String city; public Address() { } public Address(String province, String city) { this.province = province; this.city = city; } @Override public String toString() { return "Address{" + "province='" + province + '\'' + ", city='" + city + '\'' + '}'; } public String getProvince() { return province; } public void setProvince(String province) { this.province = province; } public String getCity() { return city; } public void setCity(String city) { this.city = city; } }