java - 不兼容的类型问题

Question

我正在尝试运行此程序，该程序必须包含一个 Building 类，该类由另外 2 个类 TradeCenter 和 SportCenter 扩展。该程序必须打印 3 个建筑物(数组)的信息。问题是我不断收到数组中 int 的 Incompatible types issue 错误，我不确定如何修复它，因为我是新手。有人可以帮忙吗？

class Building {
    String Name;
    String Addres;
    private int floors;

    Building(String N, String A, int F) {
        Name = N;
        Addres = A;
        floors = F;
    }

    public void SetFloors(int f) {
        if (f <= 0)
            floors = 1;
        else
            floors = f;
    }

    public int GetFloors() {
        return floors;
    }

    void Print() {
        System.out.print("Name=" + Name + "Addres=" + Addres + "floors=" + floors);
    }
}

class TradingCenter extends Building {
    String Owner;
    String Brands[] = {"Brand"};

    TradingCenter(String N, String A, int F, String O, String B[]) {
        super(N, A, F);
        Owner = O;
        Brands = B;
    }
}

class SportCenter extends Building {
    String Sports[] = {"Sport"};
    String Teams[] = {"Team"};

    SportCenter(String N, String A, int F, String S[], String T[]) {
        super(N, A, F);
        Sports = S;
        Teams = T;
    }
}

class DemoBuilding {
    public static void main(String args[]) {
        Building arr[] = new Building[3];
        arr[0] = new TradingCenter("Mall Plovdiv", "Smirnenski", 3, "Unknown", "Brand");
        arr[1] = new SportCenter("ATLETIK", "Trakia", 1, "Sport1", "Team3");
        arr[2] = new TradingCenter("Paradise Mall", "Sofia, bul. Cherni vruh 100", 5, "Unknown", "Brand");
        for (int i = 0; i < arr.length; i++)
            arr[i].Print();
    }
}

Answer 1

因为您实际上传递的不是 int 作为参数，而是一个 String。此外，您只是传递字符串，而不是传递字符串 []。

您对 TradingCenter 构造函数的定义是

TradingCenter(String N, String A, int F, String O, String B[])  
// 3rd argument is supposed to be of type int here and the last(5th) argument is supposed to be of type String[]

您对 SportCenter 构造函数的定义是

SportCenter(String N, String A, int F, String S[], String T[])
// 3rd argument is supposed to be of type int here and the second-last(4th) and the last(5th) argument is supposed to be of type String[]

检查这些:-

arr[0]=new TradingCenter("Mall Plovdiv","Smirnenski","(int)3","Unknown","Brand 2");   
//  "(int)3" is a String,not int; "Brand 2" is not a String Array
arr[1]=new SportCenter("ATLETIK","Trakia","(int)1","Sport 1","Team 3"); 
//  "(int)1" is a String,not int; "Unknown" & "Brand 2" are Strings,not the String[]
arr[2]=new TradingCenter("Paradise Mall","Sofia, bul. Cherni vruh 100","(int)5","Unknown","Brand 2");
//  "(int)5" is a String,not int; "Brand 2" is not a String Array

To simply use 3,1,5 as an integer, pass 3,1,5 directly without quotes in the constructor calling .

Also,to use "Unknown" and "Brand 2" as String[], pass them as new String[]{"Unknown} and new String[]{"Brand 2"} in the constructor.