Comparable接口和Comparator接口

朴勇佑

于 2019-12-12 11:03:10 发布

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分类专栏： Java

本文链接：https://blog.youkuaiyun.com/yongwoozzang/article/details/103505441

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本文展示了如何使用Java实现自定义的比较器MyComparator，用于比较Student类的对象。通过重写Comparator接口的compare方法，根据学生ID进行升序排序。同时，Student类也实现了Comparable接口，提供了compareTo方法来支持对象之间的比较。

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MyComparator.java

package com.company.compare;

import java.util.Comparator;

public class MyComparator implements Comparator<Student> {
    @Override
    public int compare(Student o1, Student o2) {
        if (o1.id > o2.id)
            return 1;
        else if (o1.id == o2.id)
            return 0;
        else
            return -1;
    }
}

Student.java

package com.company.compare;

public class Student implements Comparable<Student> {
    String name;
    int id;
    Student(int id, String name){
        this.id = id;
        this.name = name;
    }

    @Override
    public int compareTo(Student o) {
        if (id > o.id)
            return 1;
        else if (id == o.id)
            return 0;
        else
            return -1;
    }

    public static void main(String[] args) {
        Student st1 = new Student(1,"Jack");
        Student st2 = new Student(2,"James");
        System.out.println(st1.compareTo(st2));

        System.out.println("----");
        MyComparator comparator = new MyComparator();
        System.out.println(comparator.compare(st1, st2));
    }
}