Java实验项目三——职工类对象数组按照职工生日排序

Program：

修改项目三（1）中的第3题，实现比较方法，将对象数组的数据按照生日的大小给职工排序。

Description：令日期类MyDate和员工类Worker类实现接口Comparable，并实现方法compareTo()

代码如下：

MyDate类：

/*
 * Description:定义日期时间类,实现Comparable接口
 * 
 * Written By:Cai
 * 
 * Date Written:2017-10-18
 * 
 * 
 * */

package entity;


public class MyDate implements Comparable<MyDate> {

    private String year;    //年
    private String month;   //月
    private String day;     //日
    
    
    public MyDate() {
        
    }
    
    public MyDate(String year,String month,String day) {
        
        this.year = year;
        this.month = month;
        this.day = day;
    }

    
    //定义setter和getter方法
    public String getYear() {
        return year;
    }

    public void setYear(String year) {
        this.year = year;
    }

    public String getMonth() {
        return month;
    }

    public void setMonth(String month) {
        this.month = month;
    }

    public String getDay() {
        return day;
    }

    public void setDay(String day) {
        this.day = day;
    }
    
    //覆写toString()方法
    public String toString() {
        return this.year + "年" + this.month + "月" + this.day + "日";
    }
    

    //实现Comparable接口的compareTo()方法
    @Override
    public int compareTo(MyDate temp) {
        
        //将对象的日期连接成时间戳一起比较
        String str1 = this.year + this.month + this.day;
        String str2 = temp.getYear() + temp.getMonth() + temp.getDay();
        
        //直接调用String类的compareTo()方法，按字符串从小到大排序
        return str1.compareTo(str2);
    }

}

Worker类：

/*
 * Description:定义职工类，实现Comparable接口
 * 
 * Written By:Cai
 * 
 * Date Written:2017-10-18
 * 
 * 
 * */

package entity;

import entity.MyDate;

public class Worker implements Comparable<Worker> {

    String workerId;        　　//职工号
    String workerName;         //职工姓名
    String workerSex;          //职工性别
    String workerPartment;     //职工部门
    MyDate workerBirthday;     //职工生日
    MyDate workerBeginDate;    //职工开始工作时间
    

    //定义构造方法
    public Worker() {
        
    }
    
    public Worker(String id,String name,String sex,String partment,MyDate birthday,MyDate beginDate) {
        
        this.workerId = id;
        this.workerName = name;
        this.workerSex = sex;
        this.workerPartment = partment;
        this.workerBirthday = birthday;
        this.workerBeginDate = beginDate;
    }

    
    //定义setter和getter方法
    public String getWorkerId() {
        return workerId;
    }

    public void setWorkerId(String workerId) {
        this.workerId = workerId;
    }

    public String getWorkerName() {
        return workerName;
    }

    public void setWorkerName(String workerName) {
        this.workerName = workerName;
    }

    public String getWorkerSex() {
        return workerSex;
    }

    public void setWorkerSex(String workerSex) {
        this.workerSex = workerSex;
    }

    public String getWorkerPartment() {
        return workerPartment;
    }

    public void setWorkerPartment(String workerPartment) {
        this.workerPartment = workerPartment;
    }

    public MyDate getWorkerBirthday() {
        return workerBirthday;
    }

    public void setWorkerBirthday(MyDate workerBirthday) {
        this.workerBirthday = workerBirthday;
    }

    public MyDate getWorkerBeginDate() {
        return workerBeginDate;
    }

    public void setWorkerBeginDate(MyDate workerBeginDate) {
        this.workerBeginDate = workerBeginDate;
    }

    //覆写toString方法
    @Override
    public String toString() {
        return "Worker [workerId=" + workerId + ", workerName=" + workerName
                + ", workerSex=" + workerSex + ", workerPartment="
                + workerPartment + ", workerBirthday=" + workerBirthday
                + ", workerBeginDate=" + workerBeginDate + "]";
    }

    //实现接口中compareTo()方法，按照出生日期，从大到小排序
    @Override
    public int compareTo(Worker temp) {
        
        return this.getWorkerBirthday().compareTo(temp.getWorkerBirthday());
    }
    
}

TestDemo类：

/*
 * Description:定义测试类，模拟十个职工的单位,并且排序
 * 
 * Written By:Cai
 * 
 * Date Written:2017-10-09
 * 
 * */

package main;

import entity.*;

public class TestDemo {

    public static void main(String args[]) {
        
        Worker[] workers = new Worker[10];        //声明Worker类数组对象，大小为10
        
        //为数组对象依次赋值
        for( int i = 0; i < 10; i++ ) {
            
            workers[i] = new Worker("00000" + i,"worker_" + i,"男","办公室" + i,new MyDate("199" + (9-i), ((9-i)) + "",((9-i)) + ""  ),
                    new MyDate("200" + i, (i+1) + "",(i+1) + ""  ));
        }
        
        //对数组按照排序:按照生日由大到小排序
        java.util.Arrays.sort(workers);
        
        //打印数组对象
        display(workers);
        
    }        
    
    //定义方法，打印Worker类的数组对象信息
    public static void display(Worker[] workers) {
        
        for( int i = 0; i < workers.length; i++ ) {
            System.out.println( workers[i] );
        }
    }
    
}