据我所知，你不能。GridLayout 就是这样完成的。
但是 GridBagLayout 将为您的程序做得很好。
看看这个按行和列排列按钮的小演示。（单击按钮将其删除）。
import java.awt.Component;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.Timer;
public class Test4 {
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
JFrame frame = new JFrame();
final JPanel root = new JPanel(new GridBagLayout());
frame.add(root);
frame.setSize(600, 600);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
Timer t = new Timer(2000, new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
final JButton b = new JButton("Hello" + root.getComponentCount());
b.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
root.remove(b);
updateConstraints(root);
}
});
root.add(b);
updateConstraints(root);
}
});
t.start();
}
});
}
protected static void updateConstraints(JPanel root) {
if (!(root.getLayout() instanceof GridBagLayout)) {
System.err.println("No a gridbaglayout");
return;
}
GridBagLayout layout = (GridBagLayout) root.getLayout();
int count = root.getComponentCount();
int col = (int) Math.round(Math.sqrt(count));
int row = (int) Math.ceil((double) count / col);
GridBagConstraints gbc = new GridBagConstraints();
gbc.fill = GridBagConstraints.BOTH;
gbc.weightx = 1.0;
gbc.weighty = 1.0;
int index = 0;
for (int i = 0; i < row; i++) {
for (int j = 0; j < col; j++) {
gbc.gridx = j;
gbc.gridy = i;
boolean last = index + 1 == count;
if (last) {
gbc.gridwidth = col - j;
}
Component c = root.getComponent(index);
layout.setConstraints(c, gbc);
if (last) {
break;
}
index++;
}
}
root.doLayout();
}
}
