Java:扩展类并实现具有相同方法的接口 [英] Java: extending a class and implementing an interface that have the same method

问题描述

可能无法完成以下操作(我收到编译错误:继承的方法 A.doSomthing(int) 无法隐藏 B 中的公共抽象方法"):

Probably the following cannot be done (I am getting a compilation error: "The inherited method A.doSomthing(int) cannot hide the public abstract method in B"):

public class A {
    int doSomthing(int x) {
        return x;
    }
}

public interface B {
    int doSomthing(int x);
}

public class C extends A implements B {

    //trying to override doSomthing...

    int doSomthing(int x) {
        return doSomthingElse(x);
    }
}

假设我既不能改变 A 也不能改变 B，我的问题是我能不能以某种方式定义 C，使其同时继承 A 和 B(假设某些框架要求 C 既是一个A 和 B 的实例).

Assuming I am allowed to change neither A nor B, my question is can I somehow define C in such a way that it will inherit from both A and B (suppose that it is required for some framework that C will be both an instance of A and B).

否则，您将如何解决此问题?

Or if not, how would you work around this?

谢谢！

推荐答案

公开方法

public class C extends A implements B {

    //trying to override doSomthing...

    public int myMethod(int x) {
        return doSomthingElse(x);
    }
}

接口方法总是public

或者只是使用组合而不是继承

or just use composition instead of inheritance

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