如何让 JLabels 从下一行开始

发布于 2024-08-07 13:12:48 字数 357 浏览 5 评论 0原文

JPanel pMeasure = new JPanel();
....
JLabel economy = new JLabel("Economy");
JLabel regularity = new JLabel("Regularity");
pMeasure.add(economy);
pMeasure.add(regularity);
...

当我运行上面的代码时，我得到以下输出：

Economy Regularity

如何获得此输出，其中每个 JLabel 从新行开始？谢谢

Economy  
Regularity

原文

JPanel pMeasure = new JPanel();
....
JLabel economy = new JLabel("Economy");
JLabel regularity = new JLabel("Regularity");
pMeasure.add(economy);
pMeasure.add(regularity);
...

When I run the code above I get this output:

Economy Regularity

How can I get this output, where each JLabel starts on a new line? Thanks

Economy  
Regularity

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定格我的天空 2024-08-14 13:12:48

您需要使用布局管理器来控制 JPanel 中控件的位置和大小。布局管理器负责放置控件，确定它们的位置，它们有多大，它们之间有多少空间，调整窗口大小时会发生什么，等等。

有很多不同的布局管理器，每个都允许您布局控件以不同的方式。默认布局管理器是 FlowLayout，正如您所见，它只是将组件从左到右相邻放置。这是最简单的。其他一些常见的布局管理器有：

GridLayout - 将组件排列在行和列大小相同的矩形网格中
BorderLayout - 中心有一个主要组件，周围最多有四个组件上方、下方、左侧和右侧的组件。
GridBagLayout - 所有内置布局管理器中的 Big Bertha，它是最灵活的，但使用起来也是最复杂的。

例如，您可以使用 BoxLayout 进行布局标签。

BoxLayout 可以将其组件堆叠在一起，也可以将它们排成一行 - 您可以选择。您可能会将其视为 FlowLayout 的一个版本，但具有更强大的功能。下面是一个应用程序的图片，演示了如何使用 BoxLayout 显示居中的组件列：

使用 BoxLayout 的代码示例如下：

JPanel pMeasure = new JPanel();
....
JLabel economy = new JLabel("Economy");
JLabel regularity = new JLabel("Regularity");
pMeasure.setLayout(new BoxLayout(pMeasure, BoxLayout.Y_AXIS));
pMeasure.add(economy);
pMeasure.add(regularity);
...

You'll want to play around with layout managers to control the positioning and sizing of the controls in your JPanel. Layout managers are responsible for placing controls, determining where they go, how big they are, how much space is between them, what happens when you resize the window, etc.

There are oodles of different layout managers each of which allows you to layout controls in different ways. The default layout manager is FlowLayout, which as you've seen simply places components next to each other left to right. That's the simplest. Some other common layout managers are:

GridLayout - arranges components in a rectangular grid with equal-size rows and columns
BorderLayout - has one main component in the center and up to four surrounding components above, below, to the left, and to the right.
GridBagLayout - the Big Bertha of all the built-in layout managers, it is the most flexible but also the most complicated to use.

You could, for example, use a BoxLayout to layout the labels.

BoxLayout either stacks its components on top of each other or places them in a row — your choice. You might think of it as a version of FlowLayout, but with greater functionality. Here is a picture of an application that demonstrates using BoxLayout to display a centered column of components:

An example of code using BoxLayout would be:

JPanel pMeasure = new JPanel();
....
JLabel economy = new JLabel("Economy");
JLabel regularity = new JLabel("Regularity");
pMeasure.setLayout(new BoxLayout(pMeasure, BoxLayout.Y_AXIS));
pMeasure.add(economy);
pMeasure.add(regularity);
...

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清君侧 2024-08-14 13:12:48

我读了这段代码：

 pMeasure.setLayout(new BoxLayout(pMeasure, BoxLayout.VERTICAL));

看来BoxLayout没有VERTICAL。搜索后，这将使用以下代码工作：

 pMeasure.setLayout(new BoxLayout(pMeasure, BoxLayout.Y_AXIS));

I read this piece of code:

 pMeasure.setLayout(new BoxLayout(pMeasure, BoxLayout.VERTICAL));

It seems BoxLayout doesn't have VERTICAL. Upon searching, this will work using the following code:

 pMeasure.setLayout(new BoxLayout(pMeasure, BoxLayout.Y_AXIS));

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懒猫 2024-08-14 13:12:48

这是您需要使用的：

JLabel economy = new JLabel("<html>Economy<br>Regularity</html>");

Here is what you need to use:

JLabel economy = new JLabel("<html>Economy<br>Regularity</html>");

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今天小雨转甜 2024-08-14 13:12:48

一种快速方法是在 JLabel 中使用 html。
例如，包含标签。

否则，实现 BoxLayout。

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只有影子陪我不离不弃 2024-08-14 13:12:48

为每一行创建一个单独的 JPanel，并设置适合每个单词的尺寸：

JLabel wordlabel = new JLabel("Word");

JPanel word1 = new JPanel();
word1.setPreferredSize(new Dimension(#,#);

这应该适用于每个单词。然后，您可以将每个 JPanel 添加到您的主 JPanel 中。这还允许您在每个单词旁边添加其他组件。

Make a separate JPanel for each line, and set the dimensions to fit each word:

JLabel wordlabel = new JLabel("Word");

JPanel word1 = new JPanel();
word1.setPreferredSize(new Dimension(#,#);

This should work for each word. You can then add each of those JPanels to your main JPanel. This also allows you to add other components next to each word.

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