Java 将 JButton 添加到 JPanel
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Add JButtons to JPanel
提问by Flynn
I want to add a number of JButtonsto a JPanelusing a Forloop. When the user presses a button, the following code is run:
我想使用循环JButtons向 a添加多个。当用户按下按钮时，将运行以下代码：JPanelFor
for (i = 0; i < 10; i++)
{
JButton aButton = new JButton();
mainPanel.add(aButton);
mainPanel.revalidate();
mainPanel.repaint();
System.out.println("Added: " + (i + 1) + "buttons");
}
However, when I press the button, no JButtons are added to the JPanel, but the program prints the appropriate number of buttons that should be added.
但是，当我按下按钮时，没有 JButton 被添加到 JPanel，但程序会打印出应该添加的适当数量的按钮。
Not sure what the problem is here =/
不知道这里有什么问题=/
采纳答案by Flynn
I've solved my problem. I'm using NetBeans and apparently Free Layout doesn't work, so I set the JPanel's layout to Grid Layout and voila, the buttons appear
我已经解决了我的问题。我正在使用 NetBeans，显然自由布局不起作用，所以我将 JPanel 的布局设置为网格布局，瞧，按钮出现
回答by Matti Lyra
I would use the following.
我会使用以下内容。
for (i = 0; i < 10; i++) {
mainPanel.add(new JButton("Button text"));
System.out.println("Added: " + (i + 1) + "buttons");
}
mainPanel.invalidate();
mainPanel.repaint();
