1 import java.io.Serializable;
2 import java.util.ArrayList;
3 import java.util.List;
4
5 import cn.hutool.core.clone.CloneRuntimeException;
6 import cn.hutool.core.clone.Cloneable;
7 import cn.hutool.core.util.ObjectUtil;
8
9 abstract class Pet implements Serializable {
10 private static final long serialVersionUID = 6949926634898983095L;
11 protected String name;
12
13 public Pet() {
14 super();
15 }
16 public Pet(String name) {
17 super();
18 this.name = name;
19 }
20 @Override
21 public int hashCode() {
22 final int prime = 31;
23 int result = 1;
24 result = prime * result + ((name == null) ? 0 : name.hashCode());
25 return result;
26 }
27 @Override
28 public boolean equals(Object obj) {
29 if (this == obj)
30 return true;
31 if (obj == null)
32 return false;
33 if (getClass() != obj.getClass())
34 return false;
35 Pet other = (Pet) obj;
36 if (name == null) {
37 if (other.name != null)
38 return false;
39 } else if (!name.equals(other.name))
40 return false;
41 return true;
42 }
43 }
44
45 class Dog extends Pet {
46 private static final long serialVersionUID = 5872302442689438099L;
47
48 public Dog() {
49 super();
50 }
51 public Dog(String name) {
52 super(name);
53 }
54 public void bark () {
55 System.out.print(name + "犬吠");
56 }
57 @Override
58 public String toString() {
59 return "Dog [name=" + name + "]";
60 }
61 }
62
63 class Student implements Cloneable<Student>, Serializable{
64 private static final long serialVersionUID = -7925019110753655045L;
65
66 private String name;
67 private int age;
68 private List<Pet> pets;
69 public Student() {
70 super();
71 }
72 public String getName() {
73 return name;
74 }
75 public void setName(String name) {
76 this.name = name;
77 }
78 public int getAge() {
79 return age;
80 }
81 public void setAge(int age) {
82 this.age = age;
83 }
84 public List<Pet> getPets() {
85 return pets;
86 }
87 public void setPets(List<Pet> pets) {
88 this.pets = pets;
89 }
90 @Override
91 public String toString() {
92 return "Student [name=" + name + ", age=" + age + ", pets=" + pets
93 + "]";
94 }
95 @Override
96 public Student clone() {
97 try {
98 Student student = (Student)super.clone();
99 return student;
100 } catch (CloneNotSupportedException e) {
101 throw new CloneRuntimeException(e);
102 }
103 }
104 @Override
105 public int hashCode() {
106 final int prime = 31;
107 int result = 1;
108 result = prime * result + age;
109 result = prime * result + ((name == null) ? 0 : name.hashCode());
110 result = prime * result + ((pets == null) ? 0 : pets.hashCode());
111 return result;
112 }
113 @Override
114 public boolean equals(Object obj) {
115 if (this == obj)
116 return true;
117 if (obj == null)
118 return false;
119 if (getClass() != obj.getClass())
120 return false;
121 Student other = (Student) obj;
122 if (age != other.age)
123 return false;
124 if (name == null) {
125 if (other.name != null)
126 return false;
127 } else if (!name.equals(other.name))
128 return false;
129 if (pets == null) {
130 if (other.pets != null)
131 return false;
132 } else if (!pets.equals(other.pets))
133 return false;
134 return true;
135 }
136 }
137
138 public class CloneTest {
139 public static void main(String[] args) {
140 List<Pet> pets = new ArrayList<>();
141 pets.add(new Dog("柯基"));
142
143 Student s1 = new Student();
144 s1.setName("小明");
145 s1.setAge(12);
146 s1.setPets(pets);
147
148 Student s2 = s1.clone(); // 浅克隆
149 Student s3 = ObjectUtil.cloneByStream(s1); // 深克隆，注意：执行深克隆时，该类以及该类的成员变量所属的类都需要实现Serializable接口
150 Student s4 = ObjectUtil.clone(s1); // 当克隆的对象所属的类实现了Cloneable接口后，执行浅克隆，否则执行深克隆
151 // System.out.println(s1 == s2);
152 // System.out.println(s1.equals(s2));
153 // System.out.println(s1 == s3);
154 // System.out.println(s1.equals(s3));
155 // System.out.println(s1 == s4);
156 // System.out.println(s1.equals(s4));
157
158 System.out.println(s1.getPets() == s4.getPets()); // true
159 System.out.println(s1.getPets() == s3.getPets()); // false
160 System.out.println(s1.equals(s3)); // true
161 // System.out.println(s2);
162 System.out.println(s3);
163 // System.out.println(s4);
164 }
165 }
