重写hashcode和equals方法通过Stream流过滤age相同的数据

import java.util.*;
import java.util.stream.Collectors;

public class Test03 {
    public static void main(String[] args) {
        Set set = new HashSet<>();
        set.add(new Student("小王", 12));
        set.add(new Student("校长", 13));
        set.add(new Student("小liu", 12));
        System.out.println(set);

        List students = new ArrayList<>();
        students.add(new Student("a", 12));
        students.add(new Student("b", 13));
        students.add(new Student("c", 12));
        students.add(new Student("c", 15));
        students.add(new Student("c", 17));
        students.add(new Student("z", 17));
        List collect = students.stream().distinct().collect(Collectors.toList());
        System.out.println("--------------------");
        System.out.println(collect);
    }
}

class Student {
    private String name;
    private int age;

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

    @Override
    public String toString() {
        return "Student{" +
                "name='" + name + ''' +
                ", 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;
    }

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