设计手机类MobilePhone ，继承类Phone ，显示手机号码。同时定义测试类Test如下： public class Test{ public static void main(String [] args){ MobilePhone phone2=new MobilePhone("HUAWEI","13800000000","130432100000000000"); phone2.display(); } } 增加MobilePhone 类，运行Test类。 【输入形式】无 【输出形式】 Code=13800000000

【输出形式】
Code=13800000000

【代码实现】

class Phone{
    protected String code;
    public Phone(String code){
        this.code=code;
    }
}

class MobilePhone extends Phone{
    protected String phoneNumber;
    public MobilePhone(String brand, String code, String phoneNumber){
        super(code);
        this.phoneNumber=phoneNumber;
    }
    public void display(){
        System.out.println("Code="+code);
    }
}

public class Test{
    public static void main(String [] args){
        MobilePhone phone2=new MobilePhone("HUAWEI","13800000000","130432100000000000");
        phone2.display();
    }
}