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【0712作业】重写equals

news 来源：原创 2024/5/4 22:03:13

 1 package student01;
 2 /**
 3  * 重写equals
 4  * 2019-07-13
 5  * @author L
 6  *
 7  */
 8 public class Student {
 9       private String name;
10         private int id;
11         private int age;
12         
13         public String getName() {
14             return name;
15         }
16         public void setName(String name) {
17             this.name = name;
18         }
19         public int getId() {
20             return id;
21         }
22         public void setId(int id) {
23             this.id = id;
24         }
25         public int getAge() {
26             return age;
27         }
28         public void setAge(int age) {
29             this.age = age;
30         }
31         public Student() {}
32         public Student(String name, int id, int age) {
33             super();
34             this.name = name;
35             this.id = id;
36             this.age = age;
37         }
38         
39         public boolean equals(Object ob) {
40             //自反性
41             if(this==ob){
42                 return true;
43             }
44             //instanceof比较判断是否是同一类或者子父类关系
45             if(! (ob instanceof Student)){
46                 return false;
47             }
48             //判断是同一类或者子父类关系，再将Object类型强转为Student
49             Student ob1 = (Student)ob;
50             if(this.id == ob1.id && this.name.equals(ob1.name)) {
51                 return true;
52             }else {
53                 return false;
54             }
55             
56             
57         }
58         
59     }

测试

 1 package student01;
 2 
 3 public class Main {
 4      public static void main(String[] args) {
 5             Student student1 = new Student("张三",01,18);
 6             Student student2 = new Student("李四",02,17);
 7             Student student3 = new Student("张三",01,17);
 8             boolean a1 = student1.equals(student2);
 9             boolean a2 = student1.equals(student3);
10             System.out.println("student1.equals(student2)为"+a1+"\n"+"student1.equals(student3)为"+a2);
11         }
12 }