边界布局管理器BorderLayout

//BorderLayoutDemo边界布局管理器练习
import java.awt.*;
import java.awt.event.*;

@SuppressWarnings("serial")
public class BorderLayoutDemo extends Frame {
private final String names[] = { "hide north", "hide south", "hide east",
"hide west", "hide center" };
private final String locations[] = { BorderLayout.NORTH,
BorderLayout.SOUTH, BorderLayout.EAST, BorderLayout.WEST,
BorderLayout.CENTER };
private Button[] buttons = new Button[5];

public BorderLayoutDemo(String title) {
super(title);
final BorderLayout layout = (BorderLayout) this.getLayout();
ActionListener listener = new ActionListener() { // 事件监听器
public void actionPerformed(ActionEvent event) {
for (int i = 0; i < buttons.length; i++)
if (event.getSource() == buttons[i])
buttons[i].setVisible(false);
else
buttons[i].setVisible(true);
layout.layoutContainer(BorderLayoutDemo.this);
}
};
for (int i = 0; i < buttons.length; i++) {
buttons[i] = new Button(names[i]);
buttons[i].addActionListener(listener);
add(buttons[i], locations[i]);
}
setSize(250, 250);
setVisible(true);
}

public static void main(String args[]) {
new BorderLayoutDemo("hello");
}
}