如何设置使用 gridLayout 的 JPanel 最大或首选尺寸？
我在使用包含两个 JPanel 的非常简单的框架时遇到了问题。 问题出在包含四个 JButton 的 Center JPanel 的布局上。 如何为按钮或直接为使用 GridLayout 的 JPanel 设置更好的尺寸。关于图片的问题：
alt http://img42.imageshack.us/img42/4601 /恐怖.jpg ！
这里是代码： ` JFrame window = new JFrame("Horrible! LOL");
JTextField textField = new JTextField("");
textField.setPreferredSize(new Dimension(200,20));
JPanel textPanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
textPanel.add(textField);
window.add(textPanel, BorderLayout.NORTH);
JButton plus = new JButton("+");
//plus.setPreferredSize(new Dimension(50,50)); nothing would change
JButton minus = new JButton("-");
JButton per = new JButton("x");
JButton divide = new JButton("/");
JPanel prova = new JPanel(new GridLayout(2,2,10,10));
Dimension d = new Dimension(20,20);
prova.setMaximumSize(d); // nothing changed!
prova.add(plus);
prova.add(minus);
prova.add(per);
prova.add(divide);
window.add(prova, BorderLayout.CENTER);
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
window.setSize(250,300);
window.setResizable(false);
window.setVisible(true);`
哪个是好的解决方案？
亲切的问候
I had problem using a very simple frame containing two JPanel.
The problem is on the layout of the Center JPanel that contains four JButton.
How can I set a better size for buttons or directly for JPanel that uses the GridLayout. On the picture the problem:
alt http://img42.imageshack.us/img42/4601/horrible.jpg
!
Here the code: ` JFrame window = new JFrame("Horrible! LOL");
JTextField textField = new JTextField("");
textField.setPreferredSize(new Dimension(200,20));
JPanel textPanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
textPanel.add(textField);
window.add(textPanel, BorderLayout.NORTH);
JButton plus = new JButton("+");
//plus.setPreferredSize(new Dimension(50,50)); nothing would change
JButton minus = new JButton("-");
JButton per = new JButton("x");
JButton divide = new JButton("/");
JPanel prova = new JPanel(new GridLayout(2,2,10,10));
Dimension d = new Dimension(20,20);
prova.setMaximumSize(d); // nothing changed!
prova.add(plus);
prova.add(minus);
prova.add(per);
prova.add(divide);
window.add(prova, BorderLayout.CENTER);
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
window.setSize(250,300);
window.setResizable(false);
window.setVisible(true);`
Which is a good solution?
Kind regards
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评论（2）
不幸的是，网格布局不尊重首选尺寸。但如果你想坚持网格布局，那么你可以尝试这样的事情：
然后而不是直接添加到 prova 添加这样的：
经过测试，工作完美！
不过还有其他更好的方法
Unfortunately gridlayout doesent respect preferred sizes. But still if you want to stick to grid layout then you can try something like this:
And then instead of direclty adding in to prova add like this:
Tested, Works perfect!!
There are other better ways though
这就是发生在我身上的事情：
它肯定连接到网格的上边缘。
替代文本 http://img96.imageshack.us/img96/9431/stillnot.jpg< /a>
即使在这种情况下，在wrap方法中我可以设置buttons/comp的preferredSize，每个按钮都在它自己的边缘。其他解决方案怎么样。你会如何放置计算器的按钮？
亲切的问候并再次感谢！
That's what happen to me:
It's definitely attached to the upper edge of the grid.
alt text http://img96.imageshack.us/img96/9431/stillnot.jpg
Even if in this case, in the wrap method I can set the preferredSize of buttons/comp, every buttons is on its own edge. What about others solutions. How would you position buttons for a calculator?
Kind regards and thanx angain!