JAVA 开发实战经典 第二版 第五章 练习题 第 P157 T7

package com.bjpowernode;

class Yuangong {
    private String number;                    //员工号
    private String name;                      //姓名
    private double salary;                    //薪水
    private String department;                //部门
    public String tell() {
        System.out.println("--------------------------------------------------------------");
        System.out.println("员工号:" + this.number + ", 员工姓名:" + this.name + ", 薪水:" + this.salary + ", 部门:" + this.department);
        return null;
    }
    public Yuangong(String number){
        this.number = number;
        this.name = "无名氏";
        this.salary = 0;
        this.department = "未定";
    }
    public Yuangong(String number, String name){
        this.number = number;
        this.name = name;
        this.salary = 1000;
        this.department = "后勤";
    }
    public Yuangong(String number,String name,double salary,String department){
        this.number = number;
        this.name = name;
        this.salary = salary;
        this.department = department;
    }
    public Yuangong(){
    }


}
public class MyTest{
    public static void main(String args[]){
        Yuangong y1 = new Yuangong();
        y1.tell();
        Yuangong y2 = new Yuangong("1");
        y2.tell();
        Yuangong y3 = new Yuangong("2","老朱");
        y3.tell();
        Yuangong y4 = new Yuangong("3","信仰",5000.0,"门岗");
        y4.tell();
    }
}

--------------------------------------------------------------
员工号:null, 员工姓名:null, 薪水:0.0, 部门:null
--------------------------------------------------------------
员工号:1, 员工姓名:无名氏, 薪水:0.0, 部门:未定
--------------------------------------------------------------
员工号:2, 员工姓名:老朱, 薪水:1000.0, 部门:后勤
--------------------------------------------------------------
员工号:3, 员工姓名:信仰, 薪水:5000.0, 部门:门岗

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