23、保护性拷贝

 1 class Person{
 2     private String name;
 3     public Person(String name) {
 4         this.name = name;
 5     }
 6     
 7     private Person getPerson() {
 8         return new Person(name);
 9     }
10     
11     public void setName(String name){
12         this.name = name;
13     }
14     
15     public Person say(String content){
16         System.out.println(name + " say:" + content);
17         return getPerson();
18     }
19 
20     @Override
21     public String toString() {
22         return "Person [name=" + name + "]";
23     }
24     
25     
26 }
27 
28 
29 
30 public static void main(String[] args) {
31         Person person = new Person("lay");
32         
33         Person person2 = person.say("hahah");
34         person2.setName("marry");
35         person2.say("hehehe");
36         
37         person.say("what");
38 }