通达信对外api接口-面向对象经典应用使用Comparable接口自定义排序 Java经典编程案例

面向对象经典应用使用Comparable接口自定义排序 Java经典编程案例

步骤测试

import java.util.Array通达信对外api接口,通达信对外api接口,list;
import java.util.Collections;
import java.util.通达信对外api接口,通达信对外api接口,list;

public class TestEmployee {
    public static void main(String[] args) {
        List list=new ArrayList();
        list.add(new Employee(3,'zhangsan',21));
        list.add(new Employee(2,'lisi',22));
        list.add(new Employee(1,'wangwu',23));
        System.out.println('排序前：');
        for (Employee employee : list) {
            System.out.println(employee);
        }
        System.out.println('排序后：');
        //如果保存到数组中，可以用Arrays.sort()方法进行自动排序
        Collections.sort(list);				//执行自动排序
        for (Employee employee : list) {
            System.out.println(employee);
        }
    }
}

步骤1:新建一个Java类，实现Comparable接口定义的compareTo()方法，将对象按编号升序排列。

public class Employee implements Comparable {
    
    private int id;
    private String name;
    private int age;
    
    public Employee(int id, String name, int age) {
        this.id = id;
        this.name = name;
        this.age = age;
    }
    
    @Override
    public int compareTo(Employee o) {
        if (id > o.id) {
            return 1;
        } else if (id < o.id) {
            return -1;
        }
        return 0;
    }
    
    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder();
        sb.append('员工的编号：' + id + ', ');
        sb.append('员工的姓名：' + name + ', ');
        sb.append('员工的年龄：' + age);
        return sb.toString();
    }
}

文章为作者独立观点，不代表股票交易接口观点