components1.java

Swing入门必看 Swing Demo

/*
 * @(#)Components1.java 2007-4-27
 * Copyright 2007 AIC. All rights reserved. 
 */
package components;

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


/**
 * Demonstrating JLabel, JTextField, JPasswordField, JTextArea
 * 
 * Note: 
 * 		Their construtors and methods, listeners.
 * 
 * @author Henry Zhu
 */
public class Components1 extends AbstractComponents {

	private static final long serialVersionUID = 1L;

	private JLabel label;

	private JTextField textField;

	private JPasswordField passwordField;

	private JTextArea textArea;

	protected void initComponents(Box box) {
		// Icon
		Icon image = new ImageIcon( "image\\user.gif" );
		
		/* =================JLabel================== */
		
		// # JLabel constructors 
		label = new JLabel();
//		label = new JLabel("user");
//		label = new JLabel(image);
		label = new JLabel("user", image, SwingConstants.RIGHT);
		
		// # JLabel methods
		label.setText("user");
		label.setIcon(image);	
//		label.setHorizontalTextPosition(SwingConstants.RIGHT);	
//		label.setVerticalTextPosition(SwingConstants.BOTTOM);	
		
		box.add(label);
		box.add(Box.createVerticalStrut(20));

		/* ================JTextField================ */
		
		// # JTextField constructors
//		textField = new JTextField();
//		textField = new JTextField(10);
		textField = new JTextField("root");
//		textField = new JTextField("root", 10);

		// # JTextField methods
		textField.setText("root");
//		textField.setEditable(false);
		// getText, getSelectedText : reference to event handling.
		
		// # JTextField Event Listener (anonymous inner class)
		textField.addActionListener(new ActionListener() { 

			public void actionPerformed(ActionEvent e) {
				String str = textField.getText();
				textArea.append("Text = " + str + "\n");
				str = textField.getSelectedText();
				textArea.append("Selected text = " + str + "\n");
			}
			
		});
		
		box.add(textField);
		box.add(Box.createVerticalStrut(20));

		/* ==============JPasswordField============== */
		
		// # JPasswordField constructors
//		passwordField = new JPasswordField();
//		passwordField = new JPasswordField(10);
		passwordField = new JPasswordField("aic");
//		passwordField = new JPasswordField("aic", 10);
		
		// # JPasswordField methods
		// getPassword : reference to event handling.
		
		// # JPasswordField Event Listener
		passwordField.addActionListener(new ActionListener() {

			public void actionPerformed(ActionEvent e) {
				String str = new String(passwordField.getPassword());
				textArea.append("Password = " + str + "\n");				
			}
			
		});
		
		box.add(passwordField);
		box.add(Box.createVerticalStrut(20));

		/* ================JTextArea=================== */
		
		// # JTextArea constructors
//		textArea = new JTextArea();
//		textArea = new JTextArea("This is a text area.");
		textArea = new JTextArea(5, 10);
//		textArea = new JTextArea("This is a text area.", 5, 10);
		
		// # JTextArea methods
		textArea.setLineWrap(true);
		textArea.setWrapStyleWord(false);
		// append(String str), insert(String str, int pos)
		// : reference to above event handling.
		
		box.add(textArea);
		box.add(Box.createVerticalStrut(20));
	}
	
	/**
	 * 
	 * @param title
	 */
	public Components1(String title) {
		// invoke super constructor
		super(title);
	}

	public static void main(String args[]) {
		// create Components1 object
		String title = "Components: JLabel, JTextField, " +
				"JPasswordField, JTextArea";
		new Components1(title);
	}

}