Using External Data(need help before Monday)

[joey whitewolfe]

Help! I can't get it to work! do you have any suggestions? all I need it to do is save any information in a dat.file and if I haven't told you yet I'm only in High school, you guys helped me with the telephone program could you help me with this one

import java.io.*;
import java.awt.*;
import java.awt.event.*;
public class Transfer extends Frame implements ActionListener
{
                  MessageBox savedBox;
MessageBox errorBox;
DataOutputStream output;
             //Construct components
Panel dataFields = new Panel();
Panel firstRow = new Panel();
Panel secondRow = new Panel();
Panel thirdRow = new Panel();
Panel fourthRow = new Panel();
Panel buttonArea = new Panel();
                  Button submit = new Button("Submit");
Button exit = new Button("Exit");
Label nameLabel = new Label("Name:    ");
TextField name = new TextField(20);
Label studentLabel = new Label("Student ID:    ");
TextField student = new TextField(20);
Label tcnLabel = new Label("Transfer Course Number:    ");
TextField tcn = new TextField(20);
Label lcnLabel = new Label("Local Course Number:    ");
TextField lcn = new TextField(20);
public static void main(String[] args)
{
Transfer window = new Transfer();
window.setTitle("Transfer Course Substitutions");
window.setSize(450, 250);
window.setVisible(true);
}
public Transfer()
{
//Set background and layout managers
setLayout(new BorderLayout());
dataFields.setLayout(new GridLayout(6,1));
FlowLayout rowSetup = new FlowLayout(FlowLayout.LEFT,5,2);
                                                     firstRow.setLayout(rowSetup);
secondRow.setLayout(rowSetup);
thirdRow.setLayout(rowSetup);
fourthRow.setLayout(rowSetup);
buttonArea.setLayout(new FlowLayout());

//Add fields to rows
firstRow.add(nameLabel);
firstRow.add(studentLabel);
firstRow.add(tcnLabel);
firstRow.add(lcnLabel);
secondRow.add(name);
secondRow.add(student);
secondRow.add(tcn);
secondRow.add(lcn);
//Adds rows to panel
dataFields.add(firstRow);
dataFields.add(secondRow);
dataFields.add(thirdRow);
dataFields.add(fourthRow);
//Add buttons to panel
buttonArea.add(submit);
buttonArea.add(exit);
//Add panels to frame
add(dataFields, BorderLayout.NORTH);
add(buttonArea, BorderLayout.SOUTH);
//Add functionality to buttons
submit.addActionListener(this);
exit.addActionListener(this);
//Open the file
try
{
output = new DataOutputStream(new FileOutputStream("Transfer.dat"));
}
catch(IOException ex)
{
System.exit(1);
}
//Construct window listener
addWindowListener(
new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
}
);
}

public void actionPerformed(ActionEvent e)
{
String arg = e.getActionCommand();
String code;
if (arg == "Submit")
    code = "S";
else 
    code = "E";
                if( 
(name.getText().compareTo("")<1)||
(student.getText().compareTo("")<1)||
(tcn.getText().compareTo("")<1)||
(lcn.getText().compareTo("")<1)||
   )
               {
 errorBox = new MessageBox(this, "Data Enty Error", "You must complete all fields.");
errorBox.setVisible(true);
               }
               else
               {

try
{
output.writeUTF(code);
output.writeUTF(name.getText());
output.writeUTF(student.getText());
output.writeUTF(tcn.getText());
output.writeUTF(lcn.getText());

                  savedBox = new MessageBox(this, "Data Submitted", "The transfer information has been saved.");
savedBox.setVisible(true);
}
catch(IOException c)
{
System.exit(1);
}
      clearFields();
}
else      // code to execute if user clicks Exit
{
     try 
      {
output.close();
      }
           catch(IOException c)
      {
System.exit(1);
       }
System.exit(0);
            }       
}
public void clearFields()
{
//Clear fields and reset the focus
name.setText("");
student.setText("");
tcn.setText("");
lcn.setText("");
name.requestFocus();
}
        }

[ edited to preserve formatting using the [code] and [/code] UBB tags -ds ]
[ September 14, 2002: Message edited by: Dirk Schreckmann ]

[Dirk Schreckmann]

When you say that you can't get it to work, what do you mean exactly? Which part is causing you a problem? What should that part do and what is it actually doing? Why do you think that it's doing that?

[Barry Gaunt]

Joey, like what did you have in mind when you wrote this program? What's the heat about Monday? Assignment?
-Barry

[joey whitewolfe]

it was a weekend project and is due monday
the exit the program button doesn't work I tried adding code to it but then it doesn't compile here is the second change which runs but like i said the exit button doesn't exit the program

import java.io.*;
import java.awt.*;
import java.awt.event.*;
public class Transfer extends Frame implements ActionListener
{
MessageBox savedBox;
MessageBox errorBox;
DataOutputStream output;
//Construct components
Panel dataFields = new Panel();
Panel firstRow = new Panel();
Panel secondRow = new Panel();
Panel thirdRow = new Panel();
Panel fourthRow = new Panel();
                 
Panel buttonArea = new Panel();
                  Button submit = new Button("    Submit    ");
Button exit = new Button("    Exit        ");
Label nameLabel = new Label("Name:                                              ");
TextField name = new TextField(20);
Label studentLabel = new Label("Student ID:                                      ");
TextField student = new TextField(20);
Label tcnLabel = new Label("Transfer Course Number:           ");
TextField tcn = new TextField(20);
Label lcnLabel = new Label("Local Course Number:                ");
TextField lcn = new TextField(20);
 public static void main(String[] args)
{
Transfer window = new Transfer();
window.setTitle("Transfer Course Substitutions");
window.setSize(450, 250);
window.setVisible(true);
}
public Transfer()
{
               //Set background and layout managers
setBackground(Color.gray);
setLayout(new BorderLayout());
                  dataFields.setLayout(new GridLayout(4,2));
FlowLayout rowSetup = new FlowLayout();
                  firstRow.setLayout(rowSetup);
secondRow.setLayout(rowSetup);
thirdRow.setLayout(rowSetup);
fourthRow.setLayout(rowSetup);

                  buttonArea.setLayout(new FlowLayout());
//Add fields to rows
firstRow.add(nameLabel);
secondRow.add(studentLabel);
thirdRow.add(tcnLabel);
fourthRow.add(lcnLabel);
firstRow.add(name);
secondRow.add(student);
thirdRow.add(tcn);
fourthRow.add(lcn);
//Adds rows to panel
dataFields.add(firstRow);
dataFields.add(secondRow);
dataFields.add(thirdRow);
dataFields.add(fourthRow);
//Add buttons to panel
buttonArea.add(submit);
buttonArea.add(exit);
//Add panels to frame
add(dataFields, BorderLayout.NORTH);
add(buttonArea, BorderLayout.SOUTH);
//Add functionality to buttons
submit.addActionListener(this);
exit.addActionListener(this); 
//Open the file
try
{
output = new DataOutputStream(new FileOutputStream("Transfer.dat"));
}
catch(IOException ex)
{
System.exit(1);
}

                                   //Construct window listener
addWindowListener(
new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
      System.exit(0);
}
                        }
                   );
                 }
                  public void actionPerformed(ActionEvent e)
{
String arg = e.getActionCommand();
String code;
if (arg == "Submit")
code = "S";
                               else
code = "E";
if (
(name.getText().compareTo("")<1)                ||
(student.getText().compareTo("")<1)||
(tcn.getText().compareTo("")<1)||
(lcn.getText().compareTo("")<1)
   )
{
errorBox = new MessageBox(this, "Data Enty Error", "You must complete all fields.");
errorBox.setVisible(true);
}
else
{

try
{
output.writeUTF(code);
output.writeUTF(name.getText());
output.writeUTF(student.getText());
output.writeUTF(tcn.getText());
output.writeUTF(lcn.getText());

savedBox = new MessageBox(this, "Data Submitted", "The Course information has been saved.");
savedBox.setVisible(true);
                   }
 catch(IOException ex)
{
System.exit(1);
}
clearFields();
}
 }

public void clearFields()
{
//Clear fields and reset the focus
name.setText("");
student.setText("");
tcn.setText("");
lcn.setText("");
name.requestFocus();
}

 
         }

(edited by Cindy to format code)
[ September 16, 2002: Message edited by: Cindy Glass ]

[Barry Gaunt]

Do NOT use if(arg == "Submit"), use if(arg.equals("Submit")).
You have defined a variable "code", so maybe you should
put if(code.equals("E")) System.exit(0); somewhere.
[ September 16, 2002: Message edited by: Barry Gaunt ]