我做了5个简单的按钮，以查看GridBagLayout约束的工作方式，并像交叉一样设置它们。我尝试尝试北向的网格宽度，gbc.gridwidth = 2; （因为默认值为0，所以1和2，即3列）是准确的。它是否应该在North按钮所在的x轴上占据3列？但是当您运行它时，按钮会全部重叠。请帮忙解释一下是什么问题？谢谢
JPanel jp = new JPanel(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
JButton jb1 = new JButton("North");
gbc.gridx = 0;
gbc.gridy = 0;
gbc.gridwidth = 2; //Here, it won't take up three columns just at the top where it sits
jp.add(jb1, gbc);
JButton jb2 = new JButton("West");
gbc.gridx = 0;
gbc.gridy = 1;
jp.add(jb2, gbc);
JButton jb3 = new JButton("Center ");
gbc.gridx = 1;
gbc.gridy = 1;
jp.add(jb3, gbc);
JButton jb4 = new JButton("East");
gbc.gridx = 2;
gbc.gridy = 1;
jp.add(jb4, gbc);
JButton jb5 = new JButton("South");
gbc.gridx = 1;
gbc.gridy = 2;
jp.add(jb5, gbc);
add(jp);
setVisible(true);
最佳答案
核心问题是，您尚未重置约束...
JButton jb1 = new JButton("North");
gbc.gridx = 0;
gbc.gridy = 0;
gbc.gridwidth = 2; //Here, it won't take up three columns just at the top where it sits
jp.add(jb1, gbc);
JButton jb2 = new JButton("West");
// Still using the gridwidth value from before...
gbc.gridx = 0;
gbc.gridy = 1;
jp.add(jb2, gbc);
这意味着对于所有其他控件，
gridwidth的值仍设置为2 ...添加
gbc = new GridBagConstraints();后，尝试添加jb1。另外，由于某些原因，
gridwidth的索引不是零，它以1开头，因此您可能想使用3代替...JButton jb1 = new JButton("North");
gbc.gridx = 0;
gbc.gridy = 0;
gbc.gridwidth = 3; //Here, it won't take up three columns just at the top where it sits
jp.add(jb1, gbc);
gbc = new GridBagConstraints();
JButton jb2 = new JButton("West");
gbc.gridx = 0;
gbc.gridy = 1;
jp.add(jb2, gbc);
现在，我可能是错的，但是您似乎正在尝试使向北按钮控制整个上一行，例如...
为此，您需要类似...
JButton jb1 = new JButton("North");
gbc.gridx = 0;
gbc.gridy = 0;
gbc.gridwidth = 3; //Here, it won't take up three columns just at the top where it sits
gbc.fill = GridBagConstraints.HORIZONTAL;
jp.add(jb1, gbc);
还有...