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  • 【0712作业】重写equals

     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+"
    "+"student1.equals(student3)为"+a2);
    11         }
    12 }
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  • 原文地址:https://www.cnblogs.com/yanglanlan/p/11187054.html
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