Question

我尝试为希望为物业缴纳年度税的当地登记人员制定一种算法。我有一个用于Properties的抽象类，该类具有用于其他类型属性的基本变量和方法。问题是，我想为一个已知的客户端打印所有属性，但我不知道如何通过超类获取属性的类型

我考虑过要在Properties类中声明另一个变量，该变量将告诉我是否有范围，然后知道了，我将拥有Building或Field。但这并不尊重多态性。如果要引入一种新型的属性，则需要更改所有内容。我对java很陌生，没有其他线索。谢谢。

public class Client {
private int CNP;
private String Name;
private int totalSum;
private Properties[] properties;

public Client(String Name, Properties[] properties) {
    this.Name = Name;
    this.properties = properties;
    setTotalSum(properties);
    CNP = 0;
}
public Client(int CNP, Properties[] properties) {
    Name = "No Name Specified";
    this.properties = properties;
    setTotalSum(properties);
    this.CNP = CNP;
}
public Client(String Name, int CNP, Properties[] properties) {
    this.Name = Name;
    this.properties = properties;
    setTotalSum(properties);
    this.CNP = CNP;
}

public String toString() {
    String s = "Contribuabil:   " + getName() + "\n" +
            "Proprietati:   \n";
    for(Properties property:properties) {
        s += property.toString();
    }
    s += "Suma totala:   " + getTotalSum();
    return s;
}

属性类

abstract class Properties {
private String nameAdress;
private int number;
private int paySum;

public Properties(String nameAdress, int number) {
    this.nameAdress = nameAdress;
    this.number = number;
}

public void setPaySum(int surface) {
    paySum = 500 * surface;
}
public void setPaySum(int surface, int rang) {
    paySum = (350 * surface) / rang;
}
public int getPaySum() {
    return paySum;
}
public String toString() {
 //here I would like to print the type of property;
}

子类建筑物

public class Building extends Properties {
private int surface;

public Building(String nameAdress, int number, int surface) {
    super(nameAdress, number);
    this.surface = surface;
    setPaySum(surface);
}

子类字段

public class Field extends Properties {
private int surface;
private int rang;

public Field(String nameAdress, int number, int surface, int rang) {
    super(nameAdress, number);
    this.surface = surface;
    this.rang = rang;
    setPaySum(surface, rang);
}

了解超类函数中的子类类型

0 个答案: