corejava第7版

corejava第7版/v1/v1ch10/AppletApplication/AppletFrame.java

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+/**
+   @version 1.31 2004-05-07
+   @author Cay Horstmann
+*/
+
+import java.awt.*;
+import java.awt.event.*;
+import java.applet.*;
+import java.io.*;
+import java.net.*;
+import java.util.*;
+import javax.swing.*;
+
+public class AppletFrame extends JFrame
+   implements AppletStub, AppletContext
+{  
+   public AppletFrame(Applet anApplet)
+   {  
+      applet = anApplet;
+      add(applet);
+      applet.setStub(this);
+   }
+
+   public void setVisible(boolean b)
+   {
+      if (b) 
+      {
+         applet.init();
+         super.setVisible(true);
+         applet.start();
+      }
+      else 
+      {
+         applet.stop();
+         super.setVisible(false);
+         applet.destroy();
+      }
+   }
+
+   // AppletStub methods
+   public boolean isActive() { return true; }
+   public URL getDocumentBase() { return null; }
+   public URL getCodeBase() { return null; }
+   public String getParameter(String name) { return ""; }
+   public AppletContext getAppletContext() { return this; }
+   public void appletResize(int width, int height) {}
+
+   // AppletContext methods
+   public AudioClip getAudioClip(URL url) { return null; }
+   public Image getImage(URL url) { return null; }
+   public Applet getApplet(String name) { return null; }
+   public Enumeration getApplets() { return null; }
+   public void showDocument(URL url) {}
+   public void showDocument(URL url, String target) {}
+   public void showStatus(String status) {}
+   public void setStream(String key, InputStream stream) {}
+   public InputStream getStream(String key) { return null; }
+   public Iterator getStreamKeys() { return null; }
+
+   private Applet applet;
+}
+

corejava第7版/v1/v1ch10/AppletApplication/CalculatorApplet.java

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+/**
+   @version 1.31 2004-05-07
+   @author Cay Horstmann
+*/
+
+import java.awt.*;
+import java.awt.event.*;
+import javax.swing.*;
+
+public class CalculatorApplet extends JApplet
+{  
+   public void init()
+   {  
+      add(new CalculatorPanel());
+   }
+}
+
+/**
+   A panel with calculator buttons and a result display.
+*/
+class CalculatorPanel extends JPanel
+{  
+   public CalculatorPanel()
+   {  
+      setLayout(new BorderLayout());
+
+      result = 0;
+      lastCommand = "=";
+      start = true;
+
+      // add the display
+
+      display = new JLabel("0");
+      add(display, BorderLayout.NORTH);
+
+      ActionListener insert = new InsertAction();
+      ActionListener command = new CommandAction();
+
+      // add the buttons in a 4 x 4 grid
+
+      panel = new JPanel();
+      panel.setLayout(new GridLayout(4, 4));
+
+      addButton("7", insert);
+      addButton("8", insert);
+      addButton("9", insert);
+      addButton("/", command);
+
+      addButton("4", insert);
+      addButton("5", insert);
+      addButton("6", insert);
+      addButton("*", command);
+
+      addButton("1", insert);
+      addButton("2", insert);
+      addButton("3", insert);
+      addButton("-", command);
+
+      addButton("0", insert);
+      addButton(".", insert);
+      addButton("=", command);
+      addButton("+", command);
+
+      add(panel, BorderLayout.CENTER);
+   }
+
+   /**
+      Adds a button to the center panel.
+      @param label the button label
+      @param listener the button listener
+   */
+   private void addButton(String label, ActionListener listener)
+   {  
+      JButton button = new JButton(label);
+      button.addActionListener(listener);
+      panel.add(button);
+   }
+
+   /**
+      This action inserts the button action string to the
+      end of the display text.
+   */
+   private class InsertAction implements ActionListener
+   {
+      public void actionPerformed(ActionEvent event)
+      {
+         String input = event.getActionCommand();
+         if (start) 
+         {
+            display.setText("");
+            start = false;
+         }
+         display.setText(display.getText() + input);
+      }
+   }
+
+   /**
+      This action executes the command that the button
+      action string denotes.
+   */
+   private class CommandAction implements ActionListener
+   {
+      public void actionPerformed(ActionEvent event)
+      {  
+         String command = event.getActionCommand();
+
+         if (start)
+         {  
+            if (command.equals("-")) 
+            { 
+               display.setText(command); 
+               start = false; 
+            }
+            else 
+               lastCommand = command;
+         }
+         else
+         {  
+            calculate(Double.parseDouble(display.getText()));
+            lastCommand = command;
+            start = true;
+         }
+      }
+   }
+
+   /**
+      Carries out the pending calculation. 
+      @param x the value to be accumulated with the prior result.
+   */
+   public void calculate(double x)
+   {
+      if (lastCommand.equals("+")) result += x;
+      else if (lastCommand.equals("-")) result -= x;
+      else if (lastCommand.equals("*")) result *= x;
+      else if (lastCommand.equals("/")) result /= x;
+      else if (lastCommand.equals("=")) result = x;
+      display.setText("" + result);
+   }
+
+   private JLabel display;
+   private JPanel panel;
+   private double result;
+   private String lastCommand;
+   private boolean start;
+}
+
+

corejava第7版/v1/v1ch10/AppletApplication/CalculatorAppletApplication.html

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+<applet code="CalculatorAppletApplication.class"
+   width="180" height="180">
+</applet>

corejava第7版/v1/v1ch10/AppletApplication/CalculatorAppletApplication.java

@@ -0,0 +1,32 @@
+/**
+   @version 1.31 2004-05-07
+   @author Cay Horstmann
+*/
+
+/*
+  The applet viewer reads the tags below if you call it with
+      appletviewer CalculatorAppletApplication.java (!)
+  No separate HTML file is required.
+  <applet code="CalculatorAppletApplication.class" width="200" height="200">
+  </applet>
+*/
+
+import javax.swing.*;
+
+public class CalculatorAppletApplication 
+   extends CalculatorApplet
+// It's an applet. It's an application. It's BOTH!
+{  
+   public static void main(String[] args)
+   {  
+      AppletFrame frame = new AppletFrame(new CalculatorApplet());
+      frame.setTitle("CalculatorAppletApplication");
+      frame.setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);
+      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+      frame.setVisible(true);
+   }
+
+   public static final int DEFAULT_WIDTH = 200;
+   public static final int DEFAULT_HEIGHT = 200;
+}
+

corejava第7版/v1/v1ch10/Bookmark/Bookmark.html

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+<html> 
+   <head> 
+      <title>Bookmark Applet</title> 
+   </head> 
+   <frameset cols="320,*"> 
+      <frame name="left" src="Left.html" 
+         marginheight="2" marginwidth="2"
+         scrolling="no" noresize="noresize"/> 
+      <frame name="right" src="Right.html" 
+         marginheight="2" marginwidth="2"
+         scrolling="yes" noresize="noresize"/> 
+   </frameset> 
+</html>
+

corejava第7版/v1/v1ch10/Bookmark/Bookmark.java

@@ -0,0 +1,58 @@
+/**
+   @version 1.22 2004-05-07
+   @author Cay Horstmann
+*/
+
+import java.awt.*;
+import java.awt.event.*;
+import java.applet.*;
+import java.util.*;
+import java.net.*;
+import javax.swing.*;
+
+public class Bookmark extends JApplet 
+{  
+   public void init()
+   {  
+      Box box = Box.createVerticalBox();
+      ButtonGroup group = new ButtonGroup();
+
+      int i = 1;
+      String urlString;
+
+      // read all link.n parameters
+      while ((urlString = getParameter("link." + i)) != null)
+      {  
+
+         try
+         {  
+            final URL url = new URL(urlString);
+
+            // make a radio button for each link
+            JRadioButton button = new JRadioButton(urlString);
+            box.add(button);
+            group.add(button);
+
+            // selecting the radio button shows the URL in the "right" frame
+            button.addActionListener(new 
+               ActionListener()
+               {
+                  public void actionPerformed(ActionEvent event)
+                  {
+                     AppletContext context = getAppletContext();
+                     context.showDocument(url, "right");
+                  }
+               });
+         } 
+         catch (MalformedURLException e) 
+         { 
+            e.printStackTrace(); 
+         }
+
+         i++;
+      }
+
+      add(box);
+   }
+}
+

corejava第7版/v1/v1ch10/Bookmark/Left.html

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+<html>
+   <head><title>A Bookmark Applet</title></head>
+   <body>
+      <p>
+         Click on one of the radio buttons. 
+         The corresponding web page
+         will be displayed in the frame on the right. 
+      </p>
+      <applet code="Bookmark.class" width="290" height="300">
+         <param name="link.1" value="http://java.sun.com"/>
+         <param name="link.2" value="http://java.net"/>
+         <param name="link.3" value="http://linuxtoday.com"/>
+         <param name="link.4" value="http://www.horstmann.com"/>
+         <param name="link.5" value="http://www.phptr.com"/>
+         <param name="link.6" value="http://usps.com"/>
+         <param name="link.7" value="http://www.cafeaulait.org"/>
+      </applet>
+   </body>
+</html>
+
+
+

corejava第7版/v1/v1ch10/Bookmark/Right.html

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+<html>
+   <head><title>Web pages will be displayed here.</title></head>
+   <body>
+      <p>Click on one of the radio buttons to the left.
+      The corresponding web page will be displayed here.</p>
+   </body>
+</html>

corejava第7版/v1/v1ch10/CalculatorApplet/CalculatorApplet.html

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+<html>
+   <head><title>A Calculator</title></head>
+   <body>
+      <p>Here is a calculator, just in case you can't find yours.</p>
+      <applet code="CalculatorApplet.class" width="180" height="180">
+      </applet>
+   </body>
+</html>

corejava第7版/v1/v1ch10/CalculatorApplet/CalculatorApplet.java

@@ -0,0 +1,20 @@
+/**
+   @version 1.31 2004-05-07
+   @author Cay Horstmann
+*/
+
+import java.awt.*;
+import javax.swing.*;
+
+public class CalculatorApplet extends JApplet
+{  
+   public void init()
+   {  
+      CalculatorPanel panel = new CalculatorPanel();
+      add(panel);
+   }
+}
+
+
+
+