30.1 HashSet存储自定义对象 未去重解决

package day30_HashSet;

import java.util.HashSet;

/*
* 通过hashset存储自定义对象，没有进行去重。
*
* */
public class HashSetSutdentDemo {

    public static void main(String[] args) {
        //创建集合对象
        HashSet<Student> hs = new HashSet<Student>();

        //创建元素对象
        Student st = new Student("aa",20);
        Student st2 = new Student("bb",18);
        Student st3 = new Student("bb",18);
        //添加元素对象
        hs.add(st);
        hs.add(st2);
        hs.add(st3);

        //遍历集合对象
        for (Student s : hs) {
            System.out.println(s);
        }


    }
}

class Student {
    String name;
    int age;

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

    @Override
    public String toString() { //默认输出的是student的地址值，重写tostring方法
        return "Student{" +
                "name=‘" + name + ‘‘‘ +
                ",age=" + age +
                ‘}‘;
    }
}