面向对象 练习题4

package com.lrq;
/**
 * 
 * @author 李瑞琦
 * 4.构造方法与重载：定义一个网络用户类，
 * 要处理的信息有用户 ID、用户密码、 email 地址。
 * 在建立类的实例时把以上三个信息都作为构造函数的参数输入， 
 * 其中用户 ID 和用户密码时必须缺省时 email地址是用户 ID 加上字符串"@gameschool.com"。
 *
 */
public class TestPeople {
    public static void main(String[] args) {
        // 用户名跟密码缺省时
        TestPeople people = new TestPeople("张三", "zhangsan");
        people.show();
        // 用户名跟密码不缺省时
        TestPeople people2 = new TestPeople("李四", "lisi", "@163.com");
        people2.show();
    }

    // 私有属性id，password，email
    private String id;
    private String password;
    private String email;

    // 有参构造器给成员变量初始化
    public TestPeople(String id, String password, String email) {
        this.id = id;
        this.password = password;
        this.email = email;
    }

    public TestPeople(String id, String password) {
        this.id = id;
        this.password = password;
        this.email = this.id + "@gameschool.com";
    }

    public void show() {
        System.out.println("账号：" + id);
        System.out.println("密码：" + password);
        System.out.println("邮箱：" + email);
    }
}