Java GUI 重绘（）问题？
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Java GUI repaint() problem?
提问by Devoted
I have a JFrame. This JFrame contains a JButton. I click the JButton and 10 JTextFields are created.
我有一个 JFrame。这个 JFrame 包含一个 JButton。我单击 JButton 并创建了 10 个 JTextField。
the problem: I cannot see them until "I force a repaint()" by resizing the window. Only then do I see the JTextFields created.
问题：在“我通过调整窗口大小强制重绘（）”之前我看不到它们。只有这样我才能看到创建的 JTextFields。
CODE:
代码：
JPanel points = new JPanel();
//Creating the JTextFields:
for (int i=0; i<10; i++) {
JTextField textField = new JTextField();
points.add(textField);
}
repaint();
this.repaint();
super.repaint();
points.repaint();
THANK YOU - after the for loop, I just called points.validate() and it worked...
谢谢 - 在 for 循环之后，我只是调用了 points.validate() 并且它起作用了......
采纳答案by Tom Hawtin - tackline
Container.addAPI docs sayeth:
Container.addAPI 文档说：
Note: If a component has been added to a container that has been displayed, validate must be called on that container to display the new component. If multiple components are being added, you can improve efficiency by calling validate only once, after all the components have been added.
注意：如果组件已添加到已显示的容器中，则必须在该容器上调用 validate 以显示新组件。如果要添加多个组件，您可以在添加所有组件后仅调用一次 validate 来提高效率。
It's obscure and not very clever, but it's the rules. It may be better to call JComponent.revalidate
这很晦涩，也不是很聪明，但这是规则。打电话可能会更好JComponent.revalidate
