Java GridBagConstraints gridx和gridy无法正常工作？

我试图使用gridx和gridy约束来定位我的按钮。 但他们不工作！ 如果我更改gridx和gridy变量，则没有任何反应。 如果我将填充更改为GridBagConstraints为NONE ，它仍然无效。

我在这里错过了什么吗？

 import java.awt.*; import javax.swing.*; public class Window extends JFrame{ private static final long serialVersionUID = 1L; JFrame frame = new JFrame("GUI"); JTextField username = new JTextField(20); public void CreateWindow(){ JPanel pane = new JPanel(); pane.setLayout(new GridBagLayout()); GridBagConstraints c = new GridBagConstraints(); c.fill = GridBagConstraints.NONE; JButton button = new JButton("Button 1"); c.weightx = 1.0; c.weighty = 1.0; c.gridx = 3; //Has no effect c.gridy = 5; //Has no effect c.anchor = GridBagConstraints.NORTHWEST;//If I remove this, it still does not work. pane.add(button, c); frame.setDefaultCloseOperation(EXIT_ON_CLOSE); frame.setSize(400, 600); frame.setResizable(true); frame.setLocationRelativeTo(null); frame.add(pane); frame.setVisible(true); } } 

如果这很难理解，问题出在哪里：

 JPanel pane = new JPanel(); pane.setLayout(new GridBagLayout()); GridBagConstraints c = new GridBagConstraints(); c.fill = GridBagConstraints.NONE; JButton button = new JButton("Button 1"); c.weightx = 1.0; c.weighty = 1.0; c.gridx = 3; //Has no effect c.gridy = 5; //Has no effect c.anchor = GridBagConstraints.NORTHWEST; //If I remove this, it still does not work. pane.add(button, c); 

Answer 1

自从我完成了swing布局以来已经有一段时间了，但是如果你的JPanel中有多个JComponent，那么gridX和gridY是否只有效果？ 看起来你只有一个JButton，所以GridBagLayout没有任何布局要做。