JPanel 翻转，FlowLayout 未按预期工作
前几天这段代码可以工作。 我更改了一些内容并重新运行它，但现在它无法按预期工作。 显然，我更改的某些内容改变了行为，但我已经返回并恢复了所有这些更改，但它仍然不起作用。 忽略这一点信息（首先），为什么此代码不在 JPanel 内放置 15x15 的 JLabels 网格？
gameBoard.setLayout(new FlowLayout());
for (int i = 0; i < 15; i++)
{
for (int j = 0; j < 15; j++)
{
JLabel tile = new JLabel("");
tile.setHorizontalAlignment(SwingConstants.CENTER);
tile.setPreferredSize(new Dimension(27, 27));
tile.setBorder(new EtchedBorder());
tile.setEnabled(false);
gameBoard.add(tile);
}
}
gameBoard 是通过 NetBeans 的 GUI Builder 定义的 JPanel。 它具有首选尺寸、最大尺寸（与首选尺寸相同）。 水平/垂直调整大小选项被禁用，但是当此代码运行时，每个按钮都会水平连续延伸而不会中断。
如果我理解正确，FlowLayout 应该在元素到达其包含元素的末尾时对其进行包装。 今天之前就发生过这种情况，我真的不知道为什么这种行为停止了？
The other day this code was working. I changed some things and re-ran it and now it doesn't work as intended. Obviously something I changed altered the behaviour, but I have gone back and reverted all of those changes and it still doesn't work. Disregarding that bit of information (to start), why does this code not place a 15x15 grid of JLabels inside of a JPanel?
gameBoard.setLayout(new FlowLayout());
for (int i = 0; i < 15; i++)
{
for (int j = 0; j < 15; j++)
{
JLabel tile = new JLabel("");
tile.setHorizontalAlignment(SwingConstants.CENTER);
tile.setPreferredSize(new Dimension(27, 27));
tile.setBorder(new EtchedBorder());
tile.setEnabled(false);
gameBoard.add(tile);
}
}
gameBoard is a JPanel defined through NetBeans' GUI Builder. It has a preferred size, a maximum size (same as preferred). The horizontal/vertical resizable options are disabled, yet when this code runs every button extends horizontally in a row without ever breaking.
If I understand correctly, FlowLayout is supposed to wrap elements when they reach the end of their containing element. This was happening before today, I don't really know why this behaviour stopped?
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使用 GridLayout 会更好。
由于使用新的外观、不同的字体或某些 Java VM 升级，流程布局可能已发生变化。 不建议为此用途定义流布局，因为您依赖于可能因虚拟机或外观而异的基础大小。
It would be much better to use a GridLayout.
The flow layout may have changed due to using a new look and feel, different fonts or some Java VM upgrade. Defining a flow layout for this use is not recommended as you're reliant on underlying sizes that can vary across virtual machines or look and feels.
为了授人以渔：
修订控制系统很棒。 甚至您的系统也会定期备份源。
一种有用的调试技术是删除一些东西，直到它起作用为止。 设置边框是否会导致代码中断。 换句话说，您可以编写一个简单的程序来演示该问题吗？
In the interests of teaching a man how to fish:
Revision control systems are great. Even your system is making a back up of your source at frequent intervals.
A useful debugging technique is to take away things until it does work. Does setting a border cause you code to break. Going the other way, can you write a trivial program that demonstrates the problem.
我发现使用 TableLayout 取得了巨大的成功和控制，我会推荐给任何人。 您可以使用特定数量的像素定义列和行，也可以仅对每列和/或行使用
TableLayout.PREFERRED。 非常漂亮和灵活的布局。 我们到处都用它。I've found great success and control using TableLayout and I would recommend it to anyone. You can define the columns and rows using specific number of pixels, or you can just use
TableLayout.PREFERREDfor each column and/or row. Very nice and flexible Layout. We use it everywhere.我想到了。 显然我必须在代码本身中设置preferredSize。 仅在 Netbeans 属性窗口中设置它是不够的。 奇怪的。
I figured it out. Apparently I had to set the preferredSize within the code itself. Just setting it in the Netbeans properties window is not enough. Strange.