http://www.jexp.ru/index.php?action=history&feed=atom&title=Java_Tutorial%2FSwing_Event%2FProperty_Event 2026-04-18T18:45:40Z История изменений этой страницы в вики MediaWiki 1.30.0 http://www.jexp.ru/index.php?title=Java_Tutorial/Swing_Event/Property_Event&diff=2867&oldid=prev 2010-05-31T17:44:26Z

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<p>1 версия</p> <p><b>Новая страница</b></p><div>== Using Property Change Listeners as Observers ==<br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> &lt;!-- start source code --&gt;<br /> <br /> &lt;source lang=&quot;java&quot;&gt;<br /> import java.awt.BorderLayout;<br /> import java.awt.Color;<br /> import java.awt.EventQueue;<br /> import java.awt.event.ActionEvent;<br /> import java.awt.event.ActionListener;<br /> import java.beans.PropertyChangeEvent;<br /> import java.beans.PropertyChangeListener;<br /> import java.util.Random;<br /> import javax.swing.JButton;<br /> import javax.swing.JFrame;<br /> public class PropertyChangeListenerDemo {<br /> public static void main(String args[]) {<br /> Runnable runner = new Runnable() {<br /> public void run() {<br /> JFrame frame = new JFrame(&quot;Button Sample&quot;);<br /> frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);<br /> final JButton button1 = new JButton(&quot;Select Me&quot;);<br /> final JButton button2 = new JButton(&quot;No Select Me&quot;);<br /> final Random random = new Random();<br /> // Define ActionListener<br /> ActionListener actionListener = new ActionListener() {<br /> public void actionPerformed(ActionEvent actionEvent) {<br /> JButton button = (JButton) actionEvent.getSource();<br /> int red = random.nextInt(255);<br /> int green = random.nextInt(255);<br /> int blue = random.nextInt(255);<br /> button.setBackground(new Color(red, green, blue));<br /> }<br /> };<br /> // Define PropertyChangeListener<br /> PropertyChangeListener propertyChangeListener = new PropertyChangeListener() {<br /> public void propertyChange(PropertyChangeEvent propertyChangeEvent) {<br /> String property = propertyChangeEvent.getPropertyName();<br /> if (&quot;background&quot;.equals(property)) {<br /> button2.setBackground((Color) propertyChangeEvent.getNewValue());<br /> }<br /> }<br /> };<br /> button1.addActionListener(actionListener);<br /> button1.addPropertyChangeListener(propertyChangeListener);<br /> button2.addActionListener(actionListener);<br /> frame.add(button1, BorderLayout.NORTH);<br /> frame.add(button2, BorderLayout.SOUTH);<br /> frame.setSize(300, 100);<br /> frame.setVisible(true);<br /> }<br /> };<br /> EventQueue.invokeLater(runner);<br /> }<br /> }&lt;/source&gt;<br /> <br /> <br /> &lt;!-- end source code --&gt;</div>

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