Java - 扩展类

Question

我有一个Meeting类,我想创建一个扩展Meeting的BusinessMeeting类.

这是我的Meeting类:

public class Meeting {

private String name;
private String location;
private int start, stop;

public Meeting(String name, String location, int start, int stop) {

    this.name = name;

    this.location = location;

    this.start = start;

    this.stop = stop;

}

这是我的BusinessMeeting类:

public class BusinessMeeting extends Meeting {

    public BusinessMeeting() {

        super();

    }

}

在我的BusinessMeeting类中,我收到错误:

构造函数类会议中的会议不能应用于给定类型; required:String,String,int,int found:无参数

我不确定为什么我收到该错误消息.BusinessMeeting类不应该继承Meeting类中的所有变量吗？

Answer 1

您创建的构造函数接受4个参数,您可以不使用任何参数.如果你想在没有参数的情况下初始化它 - 添加一个空构造函数Meeting:

 public Meeting(){}

Answer 2

public class Meeting {
    public Meeting(String name, String location, int start, int stop) {

        this.name = name;

        this.location = location;

        this.start = start;

        this.stop = stop;

    }
}

现在说你想BusinessMeeting用一个扩展你的课程businessId.

public class BusinessMeeting {
    private Integer businessId;

    public BusinessMeeting(String name, String location, int start, int stop, int business) {
        // because super calls one of the super class constructors(you can overload constructors), you need to pass the parameters required.
        super(name, location, start, stop);
        businessId = business;
    }
}