Java SE 083 Swing详析及JDK对观察者模式的支持.docx

Java SE 083 Swing详析及JDK对观察者模式的支持package com.javase.swing;import java.awt.BorderLayout;import java.awt.event.WindowAdapter;import java.awt.event.WindowEvent;import javax.swing.JFrame;import javax.swing.JLabel;public class FrameDemo public static void main(String args) JFrame frame = new JFrame(FrameDemo);JLabel label = new JLabel(hello world);frame.getContentPane().add(label,BorderLayout.CENTER);frame.pack();frame.addWindowListener(new MyAdapter();frame.setVisible(true);class MyAdapter extends WindowAdapterOverridepublic void windowClosing(WindowEvent e) System.exit(0);package com.javase.swing;import java.awt.BorderLayout;import java.awt.Color;import java.awt.Dimension;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JMenuBar;public class TopLevelDemo public static void main(String args) JFrame frame = new JFrame(TopLevelDemo);frame.addWindowListener(new MyAdapter();JLabel label = new JLabel(hello);label.setBackground(Color.YELLOW);label.setPreferredSize(new Dimension(200,180);JMenuBar menuBar = new JMenuBar();menuBar.setBackground(Color.CYAN);menuBar.setPreferredSize(new Dimension(200,20);frame.setJMenuBar(menuBar);frame.getContentPane().add(label,BorderLayout.CENTER);frame.pack();frame.setVisible(true);package com.javase.swing;import java.awt.Dimension;import javax.swing.JFrame;import javax.swing.JMenu;import javax.swing.JMenuBar;import javax.swing.JMenuItem;public class MenuTest public static void main(String args) JFrame frame = new JFrame(Menu);JMenuBar mb = new JMenuBar();JMenu m1 = new JMenu(File);JMenu m2 = new JMenu(Save);JMenu m3 = new JMenu(Load);JMenu m4 = new JMenu(Quit);JMenuItem item1 = new JMenuItem(New);JMenuItem item2 = new JMenuItem(Hello);JMenuItem item3 = new JMenuItem(World);JMenuItem item4 = new JMenuItem(zhangsan);frame.setJMenuBar(mb);mb.add(m1);mb.add(m2);mb.add(m3);mb.add(m4);m1.add(item1);m1.add(item2);m1.add(item3);m1.add(item4);frame.setDefault