cardlayoutuse.java

JAVA编程思想源代码 值得一下 很难找的

package chapter11;

import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Color;
import java.awt.Frame;
import java.awt.GridLayout;
import java.awt.LayoutManager;
import java.awt.Panel;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.CardLayout;

public class CardLayoutUse extends Frame {

	public CardLayoutUse() {
		String names[] = { "RED", "YELLOW", "GREEN" };
		Color[] colors = { Color.RED, Color.YELLOW, Color.GREEN };
		Button bu[] = new Button[3];
		Panel pa[] = new Panel[3];
		Panel topP = new Panel();
		final Panel nextP = new Panel();
		GridLayout gl = new GridLayout(1, 3);

		final CardLayout cl = new CardLayout();

		topP.setLayout(gl);
		nextP.setLayout((LayoutManager) cl);

		// nextP.setLayout(new CardLayout());
		for (int i = 0; i < 3; i++) {
			bu[i] = new Button(names[i]);
			bu[i].addActionListener(new ActionListener() {

				public void actionPerformed(ActionEvent e) {
					Button button = (Button) e.getSource();
					cl.show(nextP, button.getLabel());

				}

			});
			topP.add(bu[i]);
			pa[i] = new Panel();
			pa[i].setBackground(colors[i]);
			nextP.add(pa[i], names[i]);
		}
		add(topP, BorderLayout.NORTH);
		add(nextP, BorderLayout.CENTER);
		setSize(300, 300);
		setVisible(true);

	}

	public static void main(String[] args) {
		new CardLayoutUse();
	}
}