Arrays.sort自定义排序和初始排序（java）

student类：

package Arrays_API;

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

    public Student() {
    }

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

    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 getHigh() {
        return high;
    }

    public void setHigh(double high) {
        this.high = high;
    }

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

排序代码：

package Arrays_API;

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

//自定义排数方式
public class Arrays_paixu_test_Student {
    public static void main(String[] args) {
        Integer[] arr = {45,21,8,89,453,7};
        Arrays.sort(arr, new Comparator<Integer>() { //匿名内部类知识
            @Override
            public int compare(Integer o1, Integer o2) {
                return o2-o1;//数组降序排序
            //    return o1-o2;//数组升序排序
            }
        });
        System.out.println(Arrays.toString(arr));



        Student[] students = new Student[3];//定义3个学生数组
        students[0] = new Student("小王",12,172.5);
        students[1] = new Student("小红",32,176.2);
        students[2] = new Student("小李",25,160.4);
        Arrays.sort(students, new Comparator<Student>() {
            @Override
            public int compare(Student o1, Student o2) {
            //    return o1.getAge()- o2.getAge();//年龄升序排序
            //    return o2.getAge()- o1.getAge();//年龄降序排序
            //    return Double.compare(o1.getHigh(), o2.getHigh());//身高升序排序
                return Double.compare(o2.getHigh(), o1.getHigh());//身高降序排序
                //因为身高为double类型，所以比较方法不一样
            }
        });
        System.out.println(Arrays.toString(students));//需要重写to.String(),在Student类中41-48
    }
}