关于Java深clone 的例子学习

 1 public class Pet implements Cloneable{
 2     String name;
 3     
 4     public Pet(String name){
 5         this.name = name;
 6     }
 7     
 8     public void setName(String name){
 9         this.name = name;
10     }
11     
12     public String toString(){
13         return "its name is "+name;
14     }
15     
16     public Pet clone(){
17         try {
18             return (Pet) super.clone();
19         } catch (CloneNotSupportedException e) {
20             // TODO Auto-generated catch block
21             e.printStackTrace();
22         }
23         return null;
24     }
25     
26 }

 1 public class Man implements Cloneable{
 2     String name;
 3     int age;
 4     Pet pet;
 5 
 6     public Man(String name, int age, Pet pet) {
 7         this.name = name;
 8         this.age = age;
 9         this.pet = pet;
10     }
11 
12     public Man clone() {
13         Man m;
14         Pet p;
15         try {
16             m = (Man) super.clone();
17             p = (Pet) this.pet.clone();
18             m.pet = p;
19             return m;
20         } catch (CloneNotSupportedException e) {
21             // TODO Auto-generated catch block
22             e.printStackTrace();
23         }
24         return null;
25     }
26 
27     public String toString() {
28         return "the man named " + name + " who is " + age
29                 + " years old owns the pet which " + pet.toString();
30     }
31 }

public class Woman implements Cloneable {

    String name;
    int age;
    Pet pet;

    public Woman(String name, int age, Pet pet) {
        this.name = name;
        this.age = age;
        this.pet = pet;
    }

    public Object clone() {
        Object o;
        try {
            o = super.clone();
            return o;
        } catch (CloneNotSupportedException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return null;
    }

    public String toString() {
        return "the woman named " + name + " who is " + age
                + " years old owns the pet which " + pet.toString();
    }
}

 1 public class CloneCompareTest {
 2   
 3     public static void main(String[] args) {
 4         Pet p = new Pet("jack");
 5         Woman w1 = new Woman("marry",21,p);
 6         Woman w2 = (Woman)w1.clone();
 7         w2.pet.setName("tom");
 8         System.out.println("w1: "+w1.toString());
 9         System.out.println("w2: "+w2.toString());
10         
11         Pet p1 = new Pet("michal");
12         Man m1= new Man("jack",32,p1);
13         Man m2 = m1.clone();
14         m2.pet.setName("gary");
15         System.out.println("m1: "+m1.toString());
16         System.out.println("m2: "+m2.toString());
17     }
18     
19 }