覆盖实例化的Java对象中的方法 [英] Overriding a method in an instantiated Java object

问题描述

我想覆盖一个由我无法控制的工厂交给我的对象中的方法。

I would like to override a method in an object that's handed to me by a factory that I have little control over.

我的具体问题是我要覆盖套接字对象<的 getInputStream 和 getOutputStream / strong>执行 电汇记录 。

My specific problem is that I want to override the getInputStream and getOutputStream of a Socket object to perform wire logging.

一般问题如下：

public class Foo {
    public Bar doBar() {
        // Some activity
    }
}

我想要实例化 Foo 并将 doBar 替换为我自己的工作，如下所示：

Where I'd like to take an instantiated Foo and replace the doBar with my own that would work as follows:

Bar doBar() {
    // My own activity
    return original.doBar();
}

对于Socket，我将返回 InputStream 和 OutputStream ，它们通过记录来拦截数据。

For the Socket I'm going to return an InputStream and OutputStream that are wrapped by logging to intercept the data.

推荐答案

由于Java使用类基于OO，这是不可能的。您可以使用装饰器模式，即为返回包装的对象编写包装器溪流。

Since Java uses class-based OO, this is impossible. What you can do is use the decorator pattern, i.e. write a wrapper for the object that returns the wrapped streams.

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