当一个类从一个抽象类扩展然后如何访问它的私有变量？

Question

我有一个抽象类A,类B从它扩展.我将这些变量设为私有且很好.

public abstract class A  {
    private String name;
    private String location;

public A(String name,String location) {
        this.name = name;
        this.location = location;
}
 public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }


    public String getLocation() {
        return location;
    }

然后我想写B班.

public class B extends A{
private int fee;
private int goals;   // something unique to class B

我不明白如何为类B编写构造函数来访问它的私有变量.我写了这样的东西,错了.

    B(int fee, int goals){
       this.fee= fee;
       this.goals=goals;
     }

你可以帮我解释一下这个简短的解释.

Answer 1

上面应该没问题,除了你必须指定对A构造函数的调用,因为通过构造a B,你也构造了一个A

例如

public B(int fee, int goals) {
    super(someName, someLocation); // this is calling A's constructor
    this.fee= fee;
    this.goals=goals;
}

在上面你不知何故必须确定如何构建一个A.您指定的值是A多少？您通常会将其传递给B的构造函数,例如

public B(int fee, int goals, String name, String location) {
    super(name, location);
    this.fee= fee;
    this.goals=goals;
}