现有类之间的通信 [英] Communication between already existing classes

问题描述

很抱歉，如果这个问题看起来很基本，已经有了答案，但是除非我将其变成一个适当的问题，否则Google找不到它.

I am sorry if this question seems pretty basic and there is already an answer for that, but unless I make it into a proper question, google won't find it.

我有一个主类，它是一个JFrame(存在并且将是一个对象，我们称它为"main")，它创建并调用了另一个JFrame类(我们将其称为window2)，但是，我仍然需要这个window2从已经存在的主类中调用方法.通常，window2的内容类似于Main mainMenu = new Main();. 但这显然创建了main的新对象，我仍然想引用已经存在的对象并从中获取信息.

I have a main class that is a JFrame(there is and will be only one object, let's call it "main"), it creates and calls another JFrame class(let's call it window2), however, I still need this window2 to call methods from the already existing main class. Normally window2 would have something like Main mainMenu = new Main();. But this obviously creates a new object of main, I still want to refer to the already existing object and get information from it.

推荐答案

依赖注入.答案取决于您的Main类是否是静态的，但让我们假设它不是:

Dependency Injection. The answer depends on whether your Main class is static, but let's assume it is not:

• 在Window2中创建主要参考:主要主要；
• 在Window2中创建一个方法:public void injectMainInstance(Main main){this.main = main}
• 在Main中，您拥有Window2实例window2.呼叫window2.injectMainInstance(this);

您现在应该可以通过main.mainMethodTBUsed();进入Window2.

You should be good to go now in Window2 with main.mainMethodTBUsed();

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