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cpp/TruckDriverSemiVirtual.cpp

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+#include <iostream>
+#include <string>
+
+using namespace std;
+
+class TruckDriverVirtualMembers
+{
+public:
+	string Name(void) { return myName; }
+
+protected:
+	string myName;
+	int    myAge;
+	string myHomeAddress;
+};
+
+class TruckDriver : virtual public TruckDriverVirtualMembers
+{
+public:
+	TruckDriver(string name, string ID)
+	: myLicenceID(ID)
+	{
+		myName = name;
+	}
+
+	string ID(void)	  { return myLicenceID; }
+
+private:
+	string myLicenceID;
+};
+
+
+class JapaneseTruckDriver : public TruckDriver
+{
+public:
+	JapaneseTruckDriver(string name, string ID)
+	: TruckDriver(name, ID)
+	{}
+};
+
+class FrenchTruckDriver : public TruckDriver
+{
+public:
+	FrenchTruckDriver(string name, string ID)
+	: TruckDriver("M(me). " + name, ID)
+	{}
+};
+
+class AmericanTruckDriver : public TruckDriver
+{
+public:
+	AmericanTruckDriver(string name, string ID)
+	: TruckDriver("Good ol' " + name, ID)
+	{}
+};
+
+class AustralianTruckDriver : public TruckDriver
+{
+public:
+	AustralianTruckDriver(string name, string ID)
+	: TruckDriver("Bloody " + name, ID)
+	{}
+};
+
+
+class InternationalTruckDriver : public JapaneseTruckDriver
+			       , public FrenchTruckDriver
+			       , public AmericanTruckDriver
+			       , public AustralianTruckDriver
+{
+public:
+	InternationalTruckDriver(string name, string JapanID, string FranceID,
+				 	      string USID, string AustraliaID)
+	: JapaneseTruckDriver	(name, JapanID)
+	, FrenchTruckDriver	(name, FranceID)
+	, AmericanTruckDriver	(name, USID)
+	, AustralianTruckDriver	(name, AustraliaID)
+	{}
+};
+
+#define  SIZEOF(Class) cout << #Class ": " << sizeof(Class) << " bytes" << endl;
+
+int main(void)
+{
+	SIZEOF(TruckDriver);
+	SIZEOF(FrenchTruckDriver);
+	SIZEOF(JapaneseTruckDriver);
+	SIZEOF(AmericanTruckDriver);
+	SIZEOF(AustralianTruckDriver);
+	SIZEOF(InternationalTruckDriver);
+}
+
+
+

java/chat/CS547Chat.java

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+import java.io.*;
+import java.net.*;
+import java.util.*;
+
+public class  CS547Chat
+{
+         String open;
+         tag sender;
+         tag receiver;
+         tag time;
+         tag message;
+         String close;
+
+         public CS547Chat (String sender ,String receiver ,
+                           String time, String message, 
+                           String op)
+         {
+           this.open = "<" + op + ">";
+           this.sender = new tag (sender ,"sender");
+           this.receiver = new tag (receiver ,"receiver");
+           this.time = new tag (time ,"time");
+           this.message = new tag (message ,"message");
+           this.close = "</" + op + ">";
+         }
+
+         public CS547Chat(String op)
+         {
+        	 this.open = "<" + op + ">";
+                 this.sender = new tag ("sender");
+                 this.receiver = new tag ("receiver");
+                 this.time = new tag ("time");
+                 this.message = new tag ("message");
+        	 this.close = "</" + op + ">";
+         }   
+
+         public static void main(String[] args)
+         {
+           CS547Chat chat = new CS547Chat ("Archana", "Sumant", "10:10",
+                                           "Hi! I love you", 
+                                           "CS-547-Chat");
+           StringBuffer buf = new StringBuffer ();
+           chat.write(buf);
+           System.out.println (buf);
+           String str = buf.toString ();
+           CS547Chat read_chat = new CS547Chat ("CS-547-Chat");
+           int i = read_chat.read (buf.toString(), 0);
+           System.out.println (read_chat.getSender().getData());
+           System.out.println (read_chat.getReceiver().getData());
+           System.out.println (read_chat.getTime().getData());
+           System.out.println (read_chat.getMessage().getData());
+         }
+
+         public void write (StringBuffer buf)
+         {
+           buf.append (this.open);
+           sender.write (buf);
+           receiver.write (buf);
+           time.write (buf);
+           message.write (buf);
+           buf.append (this.close);
+         }
+
+         public int read(String s ,int beginIndex)
+         {
+              	 int i = s.indexOf(this.open , beginIndex);
+        	 i += this.open.length();
+        	 i = this.sender.read (s, i);
+        	 i = this.receiver.read (s, i);
+        	 i = this.time.read (s, i);
+        	 i = this.message.read (s, i);
+        	 int j = s.indexOf(this.close, i);
+        	 return j + this.close.length();
+         }
+
+         public tag getSender ()
+         {
+           return this.sender;
+         }
+
+         public tag getReceiver ()
+         {
+           return this.receiver;
+         }
+
+         public tag getTime ()
+         {
+           return this.time;
+         }
+
+         public tag getMessage ()
+         {
+           return this.message;
+         }
+
+}

java/chat/JTextAreaDemo.java

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+import java.awt.*;
+import java.awt.event.*;
+
+import javax.swing.*;
+
+public class JTextAreaDemo extends JFrame implements ActionListener {
+	JTextField jtfInput;
+
+	JTextArea jtAreaOutput;
+
+	String newline = "\n";
+
+	public JTextAreaDemo() {
+		createGui();
+	}
+
+	public void createGui() {
+		jtfInput = new JTextField(20);
+		jtfInput.addActionListener(this);
+
+		jtAreaOutput = new JTextArea(5, 20);
+		jtAreaOutput.setCaretPosition(jtAreaOutput.getDocument().getLength());
+		jtAreaOutput.setEditable(false);
+		JScrollPane scrollPane = new JScrollPane(jtAreaOutput,
+				JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
+				JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
+
+
+		GridBagLayout gridBag = new GridBagLayout();
+		Container contentPane = getContentPane();
+		contentPane.setLayout(gridBag);
+
+		GridBagConstraints gridCons1 = new GridBagConstraints();
+       		gridCons1.gridwidth = GridBagConstraints.REMAINDER;
+        	gridCons1.fill = GridBagConstraints.HORIZONTAL;
+        	contentPane.add(jtfInput, gridCons1);
+
+        	GridBagConstraints gridCons2 = new GridBagConstraints();
+        	gridCons2.weightx = 1.0;
+        	gridCons2.weighty = 1.0;
+        	contentPane.add(scrollPane, gridCons2);
+
+	}
+
+	public void actionPerformed(ActionEvent evt) {
+		String text = jtfInput.getText();
+		jtAreaOutput.append(text + newline);
+		jtfInput.selectAll();
+	}
+
+	   public static void main(String[] args) {
+		   JTextAreaDemo jtfTfDemo = new JTextAreaDemo();		
+	        jtfTfDemo.pack();
+	        jtfTfDemo.addWindowListener(new WindowAdapter() {
+	            public void windowClosing(WindowEvent e) {
+	                System.exit(0);
+	            }
+	        });
+	        jtfTfDemo.setVisible(true);
+	    }
+}