test.java

swing 教程,与大家分享一下,哈哈,希望大家多多指教

import javax.swing.*;
import javax.swing.event.*;
import javax.swing.undo.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;

public class Test extends JApplet {
	private TextFieldPanel panel = new TextFieldPanel();
	private StateEdit stateEdit;

	private JButton startButton = new JButton("Start Edit"),
					endButton = new JButton("End Edit"),
					undoButton = new JButton("Undo");

	public void init() {
		Container contentPane = getContentPane();

		contentPane.setLayout(new FlowLayout());
		contentPane.add(startButton);
		contentPane.add(endButton);
		contentPane.add(undoButton);
		contentPane.add(panel);

		endButton.setEnabled(false);
		undoButton.setEnabled(false);

		startButton.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				stateEdit = new StateEdit(panel);
				endButton.setEnabled(true);
				startButton.setEnabled(false);
			}
		});
		endButton.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				stateEdit.end();
				undoButton.setEnabled(true);
				endButton.setEnabled(false);
			}
		});
		undoButton.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				String name = undoButton.getText();
				boolean isUndo = name.equals("Undo");

				if(isUndo) 	stateEdit.undo();	
				else		stateEdit.redo();	

				undoButton.setText(isUndo ? "Redo" : "Undo");
			}
		});
	}
}
class TextFieldPanel extends JPanel implements StateEditable {
	JTextField[] fields = new JTextField[] {
		new JTextField("text field 1"), 
		new JTextField("text field 2"),
		new JTextField("text field 3"), 
		new JTextField("text field 4"),
	};

	public TextFieldPanel() {
		setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));

		for(int i=0; i < fields.length; ++i)
			add(fields[i]);
	}
	public void storeState(Hashtable hashtable) {
		for(int i=0; i < fields.length; ++i)
			hashtable.put(fields[i], fields[i].getText());
	}
	public void restoreState(Hashtable hashtable) {
		Enumeration keys = hashtable.keys();

		while(keys.hasMoreElements()) {
			JTextField field = (JTextField)keys.nextElement();
			field.setText((String)hashtable.get(field));
		}
	}
}