网格布局管理器GridLayout

//GridLayoutDemo网格布局管理器练习
import java.awt.*;
import java.awt.event.*;

@SuppressWarnings("serial")
public class GridLayoutDemo extends Frame {
private final String names[] = { "1", "2", "3", "4", "5", "6" };
private Button[] buttons = new Button[6];
private boolean flag = true;
final GridLayout layout1 = new GridLayout(2, 3, 5, 10);
final GridLayout layout2 = new GridLayout(3, 2);

public GridLayoutDemo(String title) {
super(title);
setLayout();
ActionListener listener = new ActionListener() {
public void actionPerformed(ActionEvent event) {
setLayout();
GridLayoutDemo.this.validate();
}
};
for (int i = 0; i < buttons.length; i++) {
buttons[i] = new Button(names[i]);
buttons[i].addActionListener(listener);
add(buttons[i]);
}
setSize(250, 250);
setVisible(true);
}

public void setLayout() {
if (flag)
setLayout(layout1);
else
setLayout(layout2);
flag = !flag;
}

public static void main(String args[]) {
new GridLayoutDemo("Hello");
}
}