CIS 102 Advanced Programming Concepts
The Java Programming Class in Walnut Creek by Symon Chang

You will study the most up-to-date programming technologies including object-oriented programming, visual programming, and programming for the Internet. Topics include object-based programming, object-oriented programming, strings and characters, graphics, basic graphical user interface (GUI) components, multithreading, bit manipulation and introductory data structures.

•  Understand the program development process, including problem specification, analysis, and design using algorithmic and object-oriented methods for a large application.
•  Design a  Java application using object-oriented approach
•  Be able to write, test, and debug  Java class and GUIs
•  Be able to do I/O for application data
•  Use JDK and Windows programming environments to develop software
•  Make use of Java's classes, utilities and APIs
•  Understand and use good Java programming practices

• 10 session class, starting March 17, 1999, every Tuesday, from 6:00 PM to 10:00 PM
• At computer lab, Golden Gate University Walnut Creek Campus
• Lecture, seminar and live demonstration
• Students are required to submit their homework weekly
• Homework assignments will be discussed in the class, and hands-on during the class session
• News group will be used to facilitate the learning. Check with sti.ggu.edu web site.

Instructor Symon Chang has taught many Java classes in US, and published many Java articles on computer magazines in Taiwan. 

Week 1

• Obtain the required textbook, and read Chapter 1 to 6
• Install a Java enabled browser (i.e. NetScape 2.0+, Microsoft Internet Explorer 3.0+)
• Install JDK 1.1.7 or JDK 1.2 onto your PC workstation
• Design and implement a class that define the client of an engineering firm. The client class should have the following attributes:
  
  class Client {
          protected int clientID;
          protected String clientName;
          protected String address;
  }
  
  
• Implement all required methods, including all gets, sets, and toString() methods.
  
• Write a vector method with all reqiured methods. The main program for testing is:
  
  class ClientVector {
   
  
          public static void main(String arg[]) {
                  ClientVector v = new ClientVector();
                  Client a = new Client(1, "GGU", "Walnut Creek");
                  v.add(a);
                  Client b = new Client(2, "Symon Soft", "Walnut Creek");
                  v.add(b);
                  Client e = v.getClientAt(1);
                  System.out.println(e.getClientName());
  
          }
          
  }
• Send your program source code to the instructor via E-mail by 11:59 PM, 01/23/99. NOTE: The E-mail address is ggucis102@hotmail.com
• Download and Install Java API HTML or Window Help File (Optional)

If you install JDK 1.2 on Windows, read this page first. The size of JDK 1.2 is 20 MB. It will take 2+ hours to download under slow dial-up link.

If you are using your home machine, follow the instructions for that compiler/interpreter. You will need to create a text file called Test.java and put these contents in it:

class Test {
   public static void main (String []args) {
       System.out.println("Testing the Emergency Broadcast " +
                          "Program ");
   }
}   

SET PATH=c:\jdk1.1.7\bin;%path%

Then you should use the Java compiler (which is called javac) to compile it. Try this:

javac Test.java 

To run the program, you need to invoke the Java interpreter on the resulting class (which is called Test). So use:

java Test

Note: If you want to know more in how to get start with Java, check here...

Note: If you have problem with classpath, check here...

Week 2

To set-up your DOS windows for the Java class, you need to copy MS-DOS windows Icon from your desktop, and rename it to Java MS-DOS Window. Then, you need to change the properties of the Java Window. This will look like this....

The setjdk.bat file will look like this:

doskey
SET PATH=c:\jdk1.1.7\bin;%path%
SET CLASSPATH=.;c:\jdk1.1.7

Week 2

Please visit the following web pages:

1. Class inheritance
2. File I/O -- Sample is posted to news group.
3. Serialization

Week 3

We will have the first mid-term on 04/06/99. The mid-term will cover the following topics:

1. String Tokenizer -- page 237 - 241
2. Try-Catch-Finally --page 488 - 498
3. File I/O -- Hand-out and URL at File I/O
4. Serialization -- Hand-out and URL at Object Persistence
5. Vector -- page 232 - 236 and hand-out
   1. Size of the Vector
   2. Add an object element into Vector
   3. Get element from a Vector
   4. Remove an object from a Vector
   5. Change the content of an object in a Vector
6. Search an object from a Vector -- page 222 - 224, and page 473 - 474

Sample Employee.txt can be downloaded from here.

Week 4

AWT Programs

We will start to do same simple AWT Applets like this:

See EmployeeField.java for how to do it.

• See also AwtField.java for how to enter an integer text field.

Frequently Asked Questions

1. Q: What am I missing?

    
   
   *********** OUTPUT *************
   C:\My Documents\java1\CIS102>java ClientVector
   
   Write vector to file Client.Vector.data
   Error on writing vector to Client.Vector.data
   java.io.NotSerializableException: Client
           at java.io.ObjectOutputStream.outputObject(Compiled Code)
           at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:248)
           at java.io.ObjectOutputStream.outputArray(Compiled Code)
           at java.io.ObjectOutputStream.checkSubstitutableSpecialClasses(ObjectOutputStream.java:340)
           at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:244)
           at java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java:369)
           at java.io.ObjectOutputStream.outputObject(Compiled Code)
           at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:248)
           at ClientVector.writeAndClose(ClientVector.java:52)
           at ClientVector.main(ClientVector.java:200)
   

   A: You need to implements java.io.Serializable on your Client class.

2. Q: When I want to open a file, but the file is missing, How to catch this kind of error? A: Use try and catch on the file open command.

   Example:

   	
         String fName = "missing.txt";
   
   
         try {
                /* Open FIle */ 
                  fileInput = new FileInputStream(fName);
           } catch (Exception e)  {
                   System.err.println("Unable to open " + fName);
   		return;
           } 
   
   

Week 5 to 6

EmployeeApp Program

The EmployeeApp now is using Layout Manger. The class will like this:

See EmployeeApp.java for how to do it.

Frequently Asked Questions

1. Q: Is there a way of me changing the font?
   A: The way to change font in the paint method is:

      public void paint(Graphics g) {
   
         g.setFont(new Font("TimesRoman", Font.BOLD, 26));
         g.drawString(sTitle, 0, 40);
   
         g.setFont(new Font("TimesRoman", Font.PLAIN, 14));
         g.drawString("Symon Chang", 64, 60);
         g.drawString("e-mail: symonchang@earthlink.net", 21, 80);
   
         g.setFont(new Font("TimesRoman", Font.BOLD, 12));
         g.drawString("Press 'About' again to cancel", 39, 106);
      }
   
   

   Hit this button to see the output.

   See TestAbout.java for how to do it.

2. Q: What am I missing in my ProjectApp.class? It was OK before. I am getting null pointer exception like this:

    
   
   *********** OUTPUT *************
   D:\cis102\Homework\Project8_hw5\project>java ProjectApp
   Reading objects from Project.Vector.data ...
   Exception occurred during event dispatching:
   java.lang.NullPointerException
           at ProjectApp.action(ProjectApp.java:108)
           at java.awt.Component.handleEvent(Compiled Code)
           at java.awt.Component.postEvent(Compiled Code)
           at java.awt.Component.postEvent(Compiled Code)
           at java.awt.Component.postEvent(Compiled Code)
           at java.awt.Component.postEvent(Compiled Code)
           at java.awt.Component.dispatchEventImpl(Compiled Code)
           at java.awt.EventDispatchThread.run(Compiled Code)
   
   
   *********** PROGRAM *************
   
      public boolean action(Event evt, Object obj) {
         int id = 0; 
         String n;
         String desp;
         String c;
   	  
         if (evt.target == btnAdd) {   
               n = txtProjName.getText().trim();
    	    if (n.length() < 1) {
   		showStatus("Error: Invalid Project Name");
   		return true;        
   	    }
               a = v.getProjectByName(n);
   	    if ( null != a) {                 
   		showStatus("Error: " + n + " already exist");
                   return true;        
   	    }
   	 
   	    desp = txtProjDesp.getText().trim();
               if (desp.length() < 1) {
   		showStatus("Error: Invalid Description");
   		return true;
               }			
               c = txtClientName.getText().trim();
               if (c.length() < 1) {
                    showStatus("Error: Invalid Clinet Name");
                    return true;
               }
               c_exist = vc.getClientByName(c);  // This is line 108 
               if (null == c_exist) {
                    showStatus("Error: Client " + c + " does not exist");
                    return true;
               }	
   					
               showStatus("Adding new Project Object");
               id = v.getTotalProject() + 1;
               a = new Project(c_exist, id, n, desp);
               v.add(a);
               can.repaint();
        }
   	  
        if (evt.target == btnSave) {
               v.writeAndClose();
         }
         return true;
      }
   
   
   

   A: Your need to create the ClientVector object, before you use it. In your init() method, just add one more line:

   
         vc = new ClientVector();
   
   

Week 7

TipApplet Program

TipApplet will show the Frame of Tips Menu, which is using Menu and MenuItem in AWT.

Hit this to see the Tips Main Menu.

Week 8

EmployeeLocator Program

EmployeeLocator.java will show how to get next Employee object.

See Employee Locator Information for more information.

Employee Manager Program

EmployeeManager.java will show how to update and delete the Employee object.

See EmployeeManager.java for how to do it.

EmployeeID Program

EmployeeID.java will show how to get the Employee object by EmployeeID.

See EmployeeID.java for how to do it.

DateTest Program

DateTest.java will show how to get the Date object from GUI. It gets mm/dd/yy from GUI, and display the Date object.

See DateTest.java for how to do it.

Week 9

Tips for TIPS Project

See Tips for some tips.

How to create your own Web pages

• Create your own web site. Try to get a free web site from the Internet.
• Make sure the Web site that you selected supports ftp uploads.
• Among these free web sites, Geocities is a good choice.
• Upload all applets that you wrote onto the web site. You may use WS_FTP32 to upload your applet onto the web. If you don't have WS_FTP32 program, then download it first. The sample screen that logon WS_FTP32 to Geocities is ---->

Important Java Links

• Golden Gate University CIS 102.01 Web Page
• CIS102 class news group
• Homepage for CIS101, Spring1998
• Homepage for CIS101, Fall 1998
• CIS101 class news group
• The Java Home Page: The authoritative home page from Sun Microsystems
• A Java Tutorial from Sun
• The Java Review Service (JARS): With links to many Java examples
• Gamelan: Earthweb's Java Directory, Java Applet Museum and huge set of Java examples
• JavaWorld - IDG's magazine for the Java community
• Java Book List: Review Java books by Elliotte Rusty Harold, at Cafe Au Lait
• Compiling Java programs in Unix
• Netscape Communicator for JDK 1.1.x