HashSet存储对象

自定义一个Student对象类

代码：

import java.util.Objects;

public class Student {
    private String name;
    private int age;

    public Student(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o)
            return true;
        if (o == null || getClass() != o.getClass())
            return false;
        Student student = (Student) o;
        return age == student.age &&
                Objects.equals(name, student.name);
    }

    @Override
    public int hashCode() {
        return Objects.hash(name, age);
    }
}

 

使用HashSet存储对象

代码：

import java.util.HashSet;
public class test {
    public static void main(String[] args) {
        //创建集合对象 该集合中存储 Student类型对象
        HashSet<Student> students = new HashSet<>();
        //存储
        Student stu1 = new Student("王健林", 50);
        Student stu2 = new Student("马化腾", 40);
        Student stu3 = new Student("王云", 30);
        students.add(stu1);
        students.add(stu2);
        students.add(stu3);
       /* 结果：
        王云的年龄是30 
        王健林的年龄是50
        马化腾的年龄是40*/
        for(Student student : students){
            System.out.println(student.getName()+"的年龄是"+student.getAge());
        }


    }
}