在Netbeans中添加侦听器 [英] Adding listeners in Netbeans

问题描述

我的问题很简单:我试图添加一个WindowListener和一个onClose Listener(或通常的Listener)，但是我不知道怎么做是在Netbeans 8.0中的哪里添加代码.

My question is very simple: I'm trying to add a WindowListener and an onClose Listener (or Listener in general), but what I don't know how to do is where to add the code in Netbeans 8.0.

我有一个疑问，因为Netbeans完全自己创建了JFrame，并隐藏了该代码.我必须在Netbeans创建的自定义代码中，类构造器中或其他任何地方添加侦听器?

I have this doubt because Netbeans creates the JFrame entirely by itself, and hides that code. I have to add the Listener somewhere in this custom code created by Netbeans or in the Class Constructor, or any other place?

推荐答案

您可以使用 JFrame's Properties -> Events 和 Properties ( Bindings 有时也可以为您提供帮助.

You can add many listeners to the JFrame using JFrame's Properties -> Events and Properties (Bindings can help you sometimes too).

如果您没有得到所需的东西，只需将代码放入构造器中，或者-如果数量很多，请使用私有方法 调用在ctor中.

If you don't get what you need, just place your code into the constructor or - if it's a lot - make private method you call in the ctor.

与将所有内容都放入ctor相比，我更喜欢私有方法，但这确实是您的选择.

I mostly prefer a private method than putting all into ctor, but that's really something of your choice.

示例:

public class Example extends javax.swing.JFrame
{
    public Example()
    {
        initComponents(); // This is generated by NB - do NOT remove!

        addListeners(); // add listeners here
    }


    /**
     * Adds listeners to the frame
     */ 
    private void addListeners()
    {
        // Add your listeners here as usual
        this.addWindowListener(new WindowListener()
        {
            @Override
            public void windowOpened(WindowEvent e)
            {
                /* ... */
            }

            /* Other methods of WindowListener ... */
        });
    }

    /* ... */
}

这里只有一件事:在之后 initComponents()添加您的侦听器-这是生成的方法，它初始化了所有组件-否则某些组件可能尚未准备就绪.

Just one thing here: Add your listeners after initComponents() - that's the generated method witch initializes all components - otherwise some components may not be ready.

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