Lab Overview: General Specs

TCO:

Desired (Lab) Learning Outcome: The objective of this lab is to use an IDE to write a Swing GUI program that uses Polymorphism, Inheritance and Composition along with files.

Dependencies: Reading assignments, on-site and on-line topic/lectures.

Lab Overview: Lab Presentation

Lab Assignment: Using an IDE write a Swing GUI program that uses a Polymorphism, Inheritance, and Composition Architecture along with file usage.

Narrative/Case Study:

The objective of this lab is to use an IDE to write a Swing GUI program that uses Polymorphism, Inheritance, and Composition along with files. Since this is Java, we concentrate on the GUI, files and a PICA (Polymorphic, Inheritance, Composition Architecture). The Check Acct button gives us a Checking Account GUI, the Mortgage button gives us a Mortgage GUI.

You can write to and read from a file that works with the CheckAcct Gui — which you need to appear in order to do file operations. The Mortgage GUI file operations do not work. That is left as an exercise for you — if you want to and/or have the time.

The polymorphic operations are kept to a bare minimum. A few of my students have trouble understanding polymorphism and some more think they understand it, but really don't. And then there are those few who get it the first time — maybe. Take a look at the Visio picture/file — 9.jpg and Lab6.vsd.

For files, I use sequential output and input files for CheckAcct, while you should set up the files for the Mortgage class. Also notice that I have 3 identifiers (variables) for Account, CheckAcct and Mortgage. This is Composition. As before, this Lab mimics the previous Labs.

Environment: Once again, you should have Sun's JDK installed, as well as, if you like, an IDE like JCreator LE.

Remarks: Here is the code for the top of the class is:

/**
 * Lab 7 for CIS 355 with Prof. Ricky J. Sethi
 * GUI Lab Description
 *
 * @author Your Name Here
 * @version Version 1.0 as of 2006-05-05
 * For: CIS 355 with Professor Sethi
 *
 * Specification:
 *   input(keyboard):
 *   output(screen):
 ******************************************************************/


package cis355Package;         // Need to place .class files in cis355Package dir 
                               // Use java cis355Package/Lab6Cis355 to run
                               // Make sure gifs directory is at same level as cis355Package directory


import javax.swing.*;          // Need for Swing
import java.awt.*;             // Need for awt
import java.awt.event.*;       // Need for events
import java.io.*;              // Need for files

public class Lab7Cis355 extends JFrame {  // Start of class Lab7
   .
   .
   .
} // End of class

The attributes are:

// attributes
private JButton jbutClear;
private JButton jbutEnd;
private JPanel  jpanTop;                     //top jpanel
private JPanel  jpanMiddle;                  //middle jpanel
private JPanel  jpanBottom;                   //bottom panel

//top panel
private JTextArea  jtxaTop;             //jtextarea for top jpanel
private JButton    jbutRead;            //read the data from a file
private JButton    jbutWrite;            //write the data to a file
private FlowLayout flLt1;                //flow layout for top jpanel
private JFileChooser jfcWrite;           //JFilechooser to write data
private JFileChooser jfcRead;            //JFilechooser to read data
private JButton jbutCheckAcct;           //button for checking account
private  JButton jbutMortgage;            //button for mortgage
private boolean  isCheckAcct = false;    // is it a checking acct???
private boolean isMortgage = false;      //is it a mortgage???

//middle panel
private  JButton  jbutName;   //button for name - Account class
private  JTextField jtxfName;  //text field for first name - Account class
private  JButton  jbutAddress;  //button for address - Account class
private  JTextField jtxfAddress;   //text field for address - Account class
private  JButton  jbutCSZ; //button for city, state, zip - Account class
private  JTextField jtxfCSZ;  //text field for city, stat, zip - Account class
private JButton  jbutCheckAcctNum;  //button for number - CheckAcct class
private JTextField jtxfCheckAcctNum;  //text field for number - CheckAcct class
private JButton  jbutCheckAcctType;  //button for type - CheckAcct class
private JTextField jtxfCheckAcctType;  //text field for type - CheckAcct class
private JButton  jbutCheckAcctDep;  //button for deposit - CheckAcct class
private JTextField jtxfCheckAcctDep;  //text field for deposit - CheckAcct class
private JButton  jbutCheckAcctBal;  //button for balance - CheckAcct class
private JTextField jtxfCheckAcctBal;  //text field for balance - CheckAcct class
private JButton  jbutMortNum;        //button for number - Mortgage class
private JTextField jtxfMortNum;     //text field for number - Mortgage class
private JButton  jbutMortAmt;        //button for amount - Mortgage class
private JTextField jtxfMortAmt;     //text field for amount - Mortgage class

private JButton  jbutMortTerm;        //button for term - Mortgage class
private JTextField jtxfMortTerm;     //text field for term - Mortgage class

private JButton  jbutMortIntRate;   //button for int rate - Mortgage class
private JTextField jtxfMortIntRate; //text field - int rate - Mortgage class

private  GridLayout grLt1 ;              //grid layout for middle jpanel

private  File fileNameOfWrite;            //jfc write selected file
private File fileNameOfRead;               //jfc read selected file

//bottom panel
private  JTextArea jtxaBottom;             //output area for file
private String str1 =  "   Lab7CIS355, Sun June 5, 2005, Soln by  ";
private String str2 = "   Devry University ";
private String str3 = " \temail = email@devry.edu ";
private String str4 =  str1 + "\n" +
str2 + "\n" +
str3;
private String str5  = "You hit the clear button";

//my other classes
Account acctMy;
CheckAcct caMy;
Mortgage  mortMy;

Part of the constructor is:

public Lab7Cis355(){                           //start of constructor
  super("Lab7  CIS 355");  //title of the JFrame
  final Container theWindow   =   getContentPane(); //get ref to the JFrame

  jbutClear = new JButton("Clear Everything");
  jbutEnd = new JButton("End the Program");
  jbutEnd.setToolTipText("This button ends the program");

  //add the clear button to the west and the end button to the east
  theWindow.add(jbutClear, BorderLayout.WEST);
  theWindow.add(jbutEnd, BorderLayout.EAST);

  //create a new jtextarea for the top jpanel
  jtxaTop = new JTextArea(2, 30);
  jtxaTop.setEditable(false);
  jtxaTop.append(str4);

  //do the top jpanel
  jpanTop  =  new JPanel();
  jbutRead =  new JButton("Read Data from File");
  jbutWrite = new JButton("Write Data to file");
  jbutCheckAcct = new JButton("CK Acct");
  jbutMortgage = new JButton("Mortgage");

  flLt1     = new FlowLayout();

  jpanTop.setLayout(flLt1);
  jpanTop.add(jbutCheckAcct);
  jpanTop.add(jbutMortgage);
  jpanTop.add(jtxaTop);
  jpanTop.add(jbutRead);
  jpanTop.add(jbutWrite);
  theWindow.add(jpanTop, BorderLayout.NORTH);

  //do the middle jpanel
  jpanMiddle = new JPanel();               //create middle jpanel
  jbutName  = new JButton(" First, Last Name");
  jtxfName  = new JTextField(10);
  jbutAddress  = new JButton("Address");
  jtxfAddress  = new JTextField(10);
  jbutCSZ  = new JButton("City, State, Zip");
  jtxfCSZ  = new JTextField(10);
  jbutCheckAcctNum = new JButton("Check Acct Num");
  jtxfCheckAcctNum = new JTextField(10);
  jbutCheckAcctType = new JButton("Checking Account Type");
  jtxfCheckAcctType= new JTextField(10);
  jbutCheckAcctDep = new JButton("Checking Account Deposit ");
  jtxfCheckAcctDep = new JTextField(10);
  jbutCheckAcctBal = new JButton("Checking Account Balance");
  jtxfCheckAcctBal = new JTextField(10);
  jbutMortNum = new JButton("Mortgage Number");
  jtxfMortNum = new JTextField(15);
  jbutMortAmt = new JButton("Mortgage Amt");
  jtxfMortAmt = new JTextField(15);
  jbutMortTerm = new JButton("Mortgage Term");
  jtxfMortTerm = new JTextField(15);
  jbutMortIntRate = new JButton("Mortgage Interest Rate");
  jtxfMortIntRate = new JTextField(15);

  grLt1    = new GridLayout(10, 2);

  jpanMiddle.setLayout(grLt1);

  theWindow.add(jpanMiddle, BorderLayout.CENTER);

  //theWindow.add(jpanMiddle, BorderLayout.CENTER);

  //do the bottom panel
  jpanBottom  =  new  JPanel();
  jtxaBottom = new JTextArea(20, 60);
  jpanBottom.add(jtxaBottom);
  theWindow.add(jpanBottom, BorderLayout.SOUTH);
  .
  .
  .
}// End of constructor

The code in jbutCheckAcct.addActionListener() is:

isCheckAcct = true;                  // this is a check acct
isMortgage = false ;                  // not a mortgage
jpanMiddle.removeAll();
jpanMiddle.repaint();
jpanMiddle.setLayout(grLt1);
jpanMiddle.add(jbutName);

jpanMiddle.add(jtxfName);
jpanMiddle.add(jbutAddress);
jpanMiddle.add(jtxfAddress);
jpanMiddle.add(jbutCSZ);
jpanMiddle.add(jtxfCSZ);
jpanMiddle.add(jbutCheckAcctNum);
jpanMiddle.add(jtxfCheckAcctNum);
jpanMiddle.add(jbutCheckAcctType);
jpanMiddle.add(jtxfCheckAcctType);

jpanMiddle.add(jbutCheckAcctDep);
jpanMiddle.add(jtxfCheckAcctDep);

jpanMiddle.add(jbutCheckAcctBal);
jpanMiddle.add(jtxfCheckAcctBal);

theWindow.add(jpanMiddle, BorderLayout.CENTER);

jpanMiddle.validate();
jpanMiddle.repaint();
jtxfName.grabFocus();

The code in jbutMortgage.addActionListener() is:

isCheckAcct = false;
isMortgage = true;
jpanMiddle.removeAll();
jpanMiddle.repaint();
jpanMiddle.setLayout(grLt1);
jpanMiddle.add(jbutName);

jpanMiddle.add(jtxfName);
jpanMiddle.add(jbutAddress);
jpanMiddle.add(jtxfAddress);
jpanMiddle.add(jbutCSZ);
jpanMiddle.add(jtxfCSZ);
jpanMiddle.add(jbutMortNum);
jpanMiddle.add(jtxfMortNum);
jpanMiddle.add(jbutMortAmt);
jpanMiddle.add(jtxfMortAmt);

jpanMiddle.add(jbutMortTerm);
jpanMiddle.add(jtxfMortTerm);

jpanMiddle.add(jbutMortIntRate);
jpanMiddle.add(jtxfMortIntRate);

theWindow.add(jpanMiddle, BorderLayout.CENTER);

jpanMiddle.validate();
jpanMiddle.repaint();
jtxfName.grabFocus();

The code in jbutClear.addActionListener() is:

jtxfName.setText("");
jtxfAddress.setText("");
jtxfCSZ.setText("");
jtxfCheckAcctNum.setText("");
jtxfCheckAcctType.setText("");
jtxfCheckAcctDep.setText("");
jtxfCheckAcctBal.setText("");
jtxfMortNum.setText("");
jtxfMortAmt.setText("");
jtxfMortTerm.setText("");
jtxfMortIntRate.setText("");

jtxaBottom.setText("");

jtxfName.grabFocus();

the code for jbutEnd.addActionListener is:

JOptionPane.showMessageDialog(null, str4);
System.exit(0);

The code in jbutRead.addActionListener() is:

if (isCheckAcct) {                                 //start if
  readFromFile();
}                                 //end if

if (isMortgage) {                                 //start if

}                                 //end if

You would have to write the code for if (isMortgage)

The code in jbutWrite.addActionListener() is

if (isCheckAcct) {                                 //start if
  writeToFile();
}                                 //end if

if (isMortgage) {                                 //start if
  
}                                 //end if

As you see, you have to write the code for if (isMortgage) and please don't forget to write the code for the WindowAdapter(), as well. Finally, be sure to add in:

setSize(1100, 800);
setVisible(true);

The code for the public methods called when the two major buttons are clicked is:

public void readFromFile() {                                          //start readFromFile()
  jfcRead = new JFileChooser();
  jfcRead.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);

  int intReturnFromJFCRead = jfcRead.showOpenDialog(null);

  if(intReturnFromJFCRead == JFileChooser.APPROVE_OPTION)
    try {                            //start approve try
      { //start if
	fileNameOfRead = jfcRead.getSelectedFile();

	jtxaBottom.setText("You chose " + fileNameOfRead);

	//we are going to read from a  text file
	//we will use a  File, FileReader,
	//and a BufferedReader

	String strBufRIn;

	FileReader filerRead = new FileReader(fileNameOfRead);
	BufferedReader  bufrRead = new BufferedReader(filerRead);

	jtxaBottom.append("\nYour file has the following data::");
        
	while ((strBufRIn = bufrRead.readLine()) != null) {                                        //start while
	  jtxaBottom.append( "\n" + strBufRIn);
	}                                       //end while
      } //end if
    }                              //end approve try
    catch (IOException ioEx) {                              //start approve catch
      JOptionPane.showMessageDialog(null, "Approve JFC is Bad");
    }                              //end approve catch

  if(intReturnFromJFCRead == JFileChooser.CANCEL_OPTION || intReturnFromJFCRead == JFileChooser.ERROR_OPTION) { //start if
    jtxaBottom.setText("You either cancelled " 
		       + "or had an error, "
		       + "\nwith an Open JFileChooser");
  }                             //end if
}                                          //end readFromFile()


public void writeToFile() {                                   //start writeToFile()
  jfcWrite = new JFileChooser();
  jfcWrite.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);

  int intReturnFromJFCWrite = jfcWrite.showSaveDialog(null);

  if(intReturnFromJFCWrite == JFileChooser.APPROVE_OPTION)
    try {                            //start approve try
      { //start if
	fileNameOfWrite = jfcWrite.getSelectedFile();

	jtxaBottom.setText("You chose " + fileNameOfWrite);

	//we are going to write to a text file
	//we will use a  File, FileOutputStream
	//and a PrintWriter
             
	//set up polymorphic behavior
             
	caMy = new CheckAcct();
	acctMy = caMy;
             
	//true means append to the FileOutputStream
	FileOutputStream fosOut = new FileOutputStream(fileNameOfWrite, true);
	PrintWriter pwOut = new PrintWriter(fosOut);

	pwOut.print(jtxfName.getText());
	pwOut.print(jtxfAddress.getText());
	pwOut.print(jtxfCSZ.getText());
	pwOut.print(jtxfCheckAcctNum.getText());
	pwOut.print(jtxfCheckAcctType.getText());
	pwOut.print(jtxfCheckAcctDep.getText());
	pwOut.println(jtxfCheckAcctBal.getText());

	jtxaBottom.append("\nYou are saving the following fields:" +
			  "\n" + jtxfName.getText() +
			  "\n" + jtxfAddress.getText() +
			  "\n" + jtxfCSZ.getText() +
			  "\n" + jtxfCheckAcctNum.getText() +
			  "\n" + jtxfCheckAcctType.getText() +
			  "\n" + jtxfCheckAcctDep.getText() +
			  "\n" + jtxfCheckAcctBal.getText() +
			  "\n" + "Here is the polymorphic message" +
			  "\n" + acctMy.openCost());

	pwOut.close();
      } //end if
    }                              //end approve try
    catch (IOException ioEx) {                              //start approve catch
      JOptionPane.showMessageDialog(null, "Approve JFC is Bad");
    }                              //end approve catch


  if(intReturnFromJFCWrite == JFileChooser.CANCEL_OPTION || intReturnFromJFCWrite == JFileChooser.ERROR_OPTION) { //start if
    jtxaBottom.setText("You either cancelled " 
		       + "or had an error, "
		       + "\nwith a Save JFileChooser");
  }                             //end if
} //end writeToFile()

Please Note: it's okay not to use the package directives in the lab; you should read Appendix F and utilize them but it's not required for the lab, per se.

You can see a demo of the shell of the application here: Applet Demo Shell.

The nine (9) output files for this lab are : 1.jpg, 2.jpg, 3.jpg, 4.jpg, 5.jpg, 6.jpg, 7.jpg, 8.jpg, 9.jpg, Lab7.vsd.

Student Lab Plan

Student Name:

Date:

Read the Lab Presentation and respond to the following items prior to beginning the lab exercise.

1. Define the problem(s) to be solved.




2. Identify the steps you will take to solve the problem(s) in the order you will execute them.




3. How will you know that the problem has been solved successfully?




4. What information do you need, or what research do you need to do, in order to accomplish the solution?




5. What specific computer commands or computer tools will you use to accomplish this lab task?

Lab Student Report

Prepare this Lab Report when you have completed and lab assignment. Include any charts, graphs required to complete the lab. Refer to your initial lab plan to respond to the first questions.

1. Define the problem you were solving in this lab.




2. Did your initial plan successfully identify the tasks required to solve the problem? If not, why?




3. Did the lab require any change in the sequence of steps from your initial plan? Explain.




4. What challenges did you meet in working towards a solution?




5. Were you successful in solving the problem? If yes, explain your solution, if no, explain the solution you did use. Please be specific, and provide a detailed description of your solution.
   
   
   
6. Did you use methods you learned in class? If yes, explain your solution, if no, explain the solution you did use. Please be specific, and provide a detailed description of your solution.
   
   
   
7. What questions related to this lab still remain for you?