从JSlider的值改变JLabel的值 [英] Changing a JLabel's Value from a JSlider's Value

问题描述

我有一个包含JSlider和JLabel的JPanel。我想配置它，以便当用户更改JSlider的值时，新值将由JLabel反映。

I have a single JPanel that contains a JSlider and a JLabel. I want to configure it so that when the JSlider's value is being changed by the user, that new value is reflected by the JLabel.

我知道我可以使用以下命令触发ChangeEvents Slider，但我不知道如何将ChangeListener添加到JLabel。这是我的代码片段。

I understand that I can fire ChangeEvents with the Slider, but I don't know how to add a ChangeListener to the JLabel. Here's a snippet of my code.

scaleSlider.addChangeListener(new ChangeListener() {
    public void stateChanged(ChangeEvent event)
    {
        int currentTime = ((JSlider)event.getSource()).getValue();
        doSomething(currentTime);
        fireStateChanged(event);
    }

JLabel timeValue = new JLabel("Time: " + scaleSlider.getValue());
timeValue.add??? 

（我现在不知道该怎么做才能反映滑块的变化）

(I don't know what to do here now to reflect the changes in the slider)

我是否朝着正确的方向前进？提前感谢您的帮助。

Am I going in the right direction with this? Thanks in advance for your help.

推荐答案

您不会听取ChangeEvents一个JLabel。你在JSlider上监听ChangeEvents，然后在stateChanged（）方法中你只需使用

You don't listen for ChangeEvents on a JLabel. You listen for ChangeEvents on the JSlider and then in the stateChanged() method you simply use

label.setText("Time: " + scaleSlider.getValue());

无需从ChangeLisetner ei触发任何事件那个。

No need to fire any event from the ChangeLisetner either.

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