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;     } }