Java:接口与抽象类(关于字段) [英] Java: Interface vs Abstract Class (regarding fields)

问题描述

从我收集到的信息来看，我想强制一个类使用特定的私有字段(和方法) 我需要一个抽象类，因为接口只声明了 public/static/final 字段和方法.正确吗??

From what I have gathered, I want to force a class to use particular private fields (and methods) I need an abstract class because an interface only declares public/static/final fields and methods. Correct??

我刚刚开始了我的第一个大型 Java 项目，并希望确保以后不会伤害自己 :)

I just started my first big java project and want to make sure I'm not going to hurt myself later :)

推荐答案

两者都提供是很常见的，所以你最终会得到:

It's fairly common to provide both, so that you end up with:

public interface Sendable {
    public void sendMe();
}

和

public abstract class AbstractSender implements Sendable {
    public abstract void send();

    public void sendMe() {
        send(this.toString());
    }
}

这样，任何对抽象类中的默认实现感到满意的人都可以快速子类化，而无需重写大量代码，但是任何需要做更复杂的事情(或需要从不同的基类继承)的人仍然可以实现接口，即插即用.

That way, anyone who is happy with the default implementation in the abstract class can quickly subclass it without rewriting a lot of code, but anyone who needs to do something more complex (or who needs to inherit from a different base class) can still implement the interface and be plug-and-play.

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