检测在JTextField中输入press

检测在JTextField中输入press

本文介绍了检测在JTextField中输入press的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

是否有可能在java中输入JTextField时检测到有人按?无需创建按钮并将其设置为默认值。

Is it possible to detect when someone presses while typing in a JTextField in java? Without having to create a button and set it as the default.

推荐答案

A JTextField 被设计为使用 ActionListener ,就像 JButton 一样。请参阅 JTextField addActionListener()方法。

A JTextField was designed to use an ActionListener just like a JButton is. See the addActionListener() method of JTextField.

例如:

Action action = new AbstractAction()
{
    @Override
    public void actionPerformed(ActionEvent e)
    {
        System.out.println("some action");
    }
};

JTextField textField = new JTextField(10);
textField.addActionListener( action );

现在,当使用键时会触发事件。

Now the event is fired when the key is used.

此外,即使您不想将按钮设为默认按钮,您还可以使用按钮共享监听器。

Also, an added benefit is that you can share the listener with a button even if you don't want to make the button a default button.

JButton button = new JButton("Do Something");
button.addActionListener( action );

注意,此示例使用 Action ,实现 ActionListener ,因为 Action 是一个具有附加功能的新API。例如,您可以禁用 Action ,这将禁用文本字段和按钮的事件。

Note, this example uses an Action, which implements ActionListener because Action is a newer API with addition features. For example you could disable the Action which would disable the event for both the text field and the button.

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09-02 16:31