父类可以调用子类方法吗? [英] Can a Parent call Child Class methods?

问题描述

参考此处

A是预编译的Java类(我也有源文件)B 是我正在创作的 Java 类
B 扩展 A.

A is a precompiled Java class (I also have the source file) B is a Java class that I am authoring
B extends A.

如何实现逻辑，使 A 可以调用 B 拥有的方法.
以下是条件:

How can logic be implemented such that A can call the methods that B has.
The following are the conditions:

• 我不想碰 A(只是作为最后一个选项，如果没有存在其他解决方案).
• 我不想使用反射.

如前所述，如果需要，我可以修改 A.无论哪种方式，可能的解决方案是什么?

As stated, if needed I could modify A. What could be the possible solution either way?

推荐答案

A 类应该定义它要调用的方法(可能是抽象的，A 应该是一个抽象类，根据 PaulHaahr 的优秀指南)；B 可以(实际上是具体的 MUST，如果方法是抽象的)覆盖这些方法.现在，从 A 中的其他方法调用这些方法，当在类 B 的实例中发生时，转到 B 的覆盖.

Class A should define the methods it's going to call (probably as abstract ones, and A should be an abstract class, per Paul Haahr's excellent guide); B can (in fact to be concrete MUST, if the method are abstract) override those methods. Now, calls to those methods from other methods in A, when happening in an instance of class B, go to B's overrides.

整体设计模式被称为模板方法；要覆盖的方法通常称为挂钩方法"，执行调用的方法称为组织方法".

The overall design pattern is known as Template Method; the methods to be overridden are often called "hook methods", and the method performing the calls, the "organizing method".

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