HashSet存储对象

Posted 2021-03-04 0error0warning

自定义一个Student对象类

代码：

 1 import java.util.Objects;
 2 
 3 public class Student {
 4     private String name;
 5     private int age;
 6 
 7     public Student(String name, int age) {
 8         this.name = name;
 9         this.age = age;
10     }
11 
12     public String getName() {
13         return name;
14     }
15 
16     public void setName(String name) {
17         this.name = name;
18     }
19 
20     public int getAge() {
21         return age;
22     }
23 
24     public void setAge(int age) {
25         this.age = age;
26     }
27 
28     @Override
29     public boolean equals(Object o) {
30         if (this == o)
31             return true;
32         if (o == null || getClass() != o.getClass())
33             return false;
34         Student student = (Student) o;
35         return age == student.age &&
36                 Objects.equals(name, student.name);
37     }
38 
39     @Override
40     public int hashCode() {
41         return Objects.hash(name, age);
42     }
43 }

 

使用HashSet存储对象

代码：

 1 import java.util.HashSet;
 2 public class test {
 3     public static void main(String[] args) {
 4         //创建集合对象 该集合中存储 Student类型对象
 5         HashSet<Student> students = new HashSet<>();
 6         //存储
 7         Student stu1 = new Student("王健林", 50);
 8         Student stu2 = new Student("马化腾", 40);
 9         Student stu3 = new Student("王云", 30);
10         students.add(stu1);
11         students.add(stu2);
12         students.add(stu3);
13        /* 结果：
14         王云的年龄是30 
15         王健林的年龄是50
16         马化腾的年龄是40*/
17         for(Student student : students){
18             System.out.println(student.getName()+"的年龄是"+student.getAge());
19         }
20 
21 
22     }
23 }