Java-sort(自定义排序）

今天学到了java的匿名内部类，然后看到了通过匿名内部类的sort，感觉和c++里的sort（v.begin(),v.end()，cmp) --->bool cmp()  有点像哈。

学生类：

package com.itheima.demo4;

public class Student {
    private String name;
    private int age;
    private double score;
    private char gender;

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

    public Student(){};
    public Student(String name, int age, double score, char gender) {
        this.name = name;
        this.age = age;
        this.score = score;
        this.gender = gender;
    }

    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;
    }

    public double getScore() {
        return score;
    }

    public void setScore(double score) {
        this.score = score;
    }

    public char getGender() {
        return gender;
    }

    public void setGender(char gender) {
        this.gender = gender;
    }
}

实现排序：

 

package com.itheima.demo4;

import java.util.Arrays;
import java.util.Comparator;

public class Test2 {
    public static void main(String[] args)
    {
        Student[] students = new Student[6];
        students[0] = new Student("张三", 16, 99.5, '男');
        students[1] = new Student("李四", 14, 98.5, '女');
        students[2] = new Student("王五", 28, 97.5, '男');
        students[3] = new Student("赵六", 21, 96.5, '女');
        students[4] = new Student("孙七", 22, 95.5, '男');
        students[5] = new Student("周八", 8, 94.5, '女');

        for (int i = 0; i < students.length; i++)
        {
            System.out.println(students[i]);
        }

        System.out.println("==================================================");

        Arrays.sort(students, new Comparator<Student>(){
            @Override
            public int compare(Student o1, Student o2)
            {
                return o1.getAge() - o2.getAge();
            }
        });

        for (int i = 0; i < students.length; i++)
        {
            System.out.println(students[i]);
        }
    }

}

运行结果：

Student{name='张三', age=16, score=99.5, gender=男}
Student{name='李四', age=14, score=98.5, gender=女}
Student{name='王五', age=28, score=97.5, gender=男}
Student{name='赵六', age=21, score=96.5, gender=女}
Student{name='孙七', age=22, score=95.5, gender=男}
Student{name='周八', age=8, score=94.5, gender=女}
==================================================
Student{name='周八', age=8, score=94.5, gender=女}
Student{name='李四', age=14, score=98.5, gender=女}
Student{name='张三', age=16, score=99.5, gender=男}
Student{name='赵六', age=21, score=96.5, gender=女}
Student{name='孙七', age=22, score=95.5, gender=男}
Student{name='王五', age=28, score=97.5, gender=男}