GUI

[Mark Phylus]

I need to write a GUI application that reads in a character and displays the character's ASCII code. Guys,I need help on this.

[Michael Dunn]

Here's your GUI, just add water.

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class TestGUI extends JFrame implements ActionListener
{
  JTextField tf = new JTextField(15);
  JLabel lbl = new JLabel("Ascii code = ");
  JButton btn = new JButton("Convert");
  public TestGUI()
  {
    setTitle("Test GUI");
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setLocation(400,300);
    Container frame = getContentPane();
    JPanel jp = new JPanel(new GridLayout(3,1));
    btn.addActionListener(this);
    jp.add(tf);
    jp.add(lbl);
    jp.add(btn);
    frame.add(jp);
    pack();
  }
  public void actionPerformed(ActionEvent ae)
  {
  }
  public static void main( String[] args){new TestGUI().setVisible(true);}
}

[Mark Phylus]

public void actionPerformed(ActionEvent ae)
{
//I need code for this part
btn gets the character input and then converts it to
ASCII code and display the ASCII code to lbl.

}

Thanks

[Michael Dunn]

read it
convert it
display it
What problem are you having?

[Mark Phylus]

can't read it
can't convert it and
can't display it
help will be appreciated.
Thanks

[Michael Dunn]

I need to write a GUI application that reads in a character and displays the character's ASCII code

If you are being truthful here, YOU need to write it.
If not, then just say you want a total handout, and the thread will end.

[Vicken Karaoghlanian]

Mark, we don't do peoples homework�s around here, but if you can provide the code you have written so far, we will be more than happy to help.
I see that Michael has done more than enough by posting the GUI code, at least you can work on the conversion code, by following Michael's steps, that is read-convert-display.
Good Luck

[Mark Phylus]

Ok, here what I've done so far, and I have 3 errors. Struggling to fix them
Will appreciate some help.
Thanks.

/*
My Sample Program: Displays a frame with two buttons,
one textfield, and one text area.User enters a character
the display btn reads it and display the character's
ASCII code in the text area

*/
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class NiceGUI extends JFrame implements ActionListener {
/**
* Default frame width
*/
private static final int FRAME_WIDTH = 300;
/**
* Default frame height
*/
private static final int FRAME_HEIGHT = 270;
/**
* X coordinate of the frame default origin point
*/
private static final int FRAME_X_ORIGIN = 150;
/**
* Y coordinate of the frame default origin point
*/
private static final int FRAME_Y_ORIGIN = 250;
/**
* Default width for buttons
*/
private static final int BUTTON_WIDTH = 80;
/**
* Default height for buttons
*/
private static final int BUTTON_HEIGHT = 30;
/**
* Constant for empty string
*/
private static final String EMPTY_STRING = "";
/**
* Constant for platform specific newline
*/
private static final String NEWLINE = System.getProperty("line.separator");
/**
* The Swing button for Cancel
*/
private JButton clearButton;
/**
* The Swing button for OK
*/
private JButton addButton;
/**
* The JTextField for the user to enter a text
*/
private JTextField inputLine;
/**
* The JTextArea for displaying the entered text
*/
private JTextArea textArea;
//----------------------------------
// Main method
//----------------------------------
public static void main(String[] args) {
NiceGUI frame = new NiceGUI();
frame.setVisible(true);
}

//----------------------------------
// Constructors
//----------------------------------
/**
* Default constructor
*/
public NiceGUI(){
Container contentPane;
//set the frame properties
setSize (FRAME_WIDTH, FRAME_HEIGHT);
setResizable (false);
setTitle ("Welcome to the Program");
setLocation (FRAME_X_ORIGIN, FRAME_Y_ORIGIN);
contentPane = getContentPane( );
contentPane.setLayout( null );
contentPane.setBackground( Color.white );
//create and place two buttons on the frame
addButton = new JButton("Display");
addButton.setBounds(70, 190, BUTTON_WIDTH, BUTTON_HEIGHT);
contentPane.add(addButton);
clearButton = new JButton("CLEAR");
clearButton.setBounds(160, 190, BUTTON_WIDTH, BUTTON_HEIGHT);
contentPane.add(clearButton);
//register this frame as an action listener of the two buttons
clearButton.addActionListener(this);
addButton.addActionListener(this);
inputLine = new JTextField();
inputLine.setBounds(90, 155, 130, 25);
contentPane.add(inputLine);
inputLine.addActionListener(this);
textArea = new JTextArea();
textArea.setBounds(50, 5, 200, 130);
textArea.setBorder(BorderFactory.createLineBorder(Color.red));
//---------------------------------------
// Different types of borders; some borders effective if background color is changed
//
// textArea.setBorder(BorderFactory.createEtchedBorder(Color.blue, Color.gray));
// textArea.setBorder(BorderFactory.createLoweredBevelBorder());
// textArea.setBorder(BorderFactory.createRaisedBevelBorder());
// textArea.setBorder(BorderFactory.createTitledBorder("JTextArea"));
//
//-------------------------------------
textArea.setEditable(false);
contentPane.add(textArea);
//----------------------------------------------------
// To add scroll bars to the text area
/*
textArea = new JTextArea();
JScrollPane scrollText= new JScrollPane(textArea);
scrollText.setBounds(50, 5, 200, 135);
scrollText.setBorder(BorderFactory.createLineBorder(Color.red));
contentPane.add(scrollText);
*/
//------------------------------------------------------
//register 'Exit upon closing' as a default close operation
setDefaultCloseOperation( EXIT_ON_CLOSE );
}
//-------------------------------------------------
// Public Methods:
//
// void actionPerformed ( ActionEvent )
//
//------------------------------------------------
/**
* Standard method to respond the action event.
*
*/
// Error message
final String INVALID_INPUT_MESSAGE = "Re-enter character Please!";
//*************************************************************************
public void actionPerformed(ActionEvent event) {
Char c;
if (event.getSource() instanceof JButton){
JButton clickedButton = (JButton) event.getSource();
if (clickedButton == addButton) {

Char c = inputLine.getText(charAt(0));
addText(inputLine.getText(c));

} else {

textArea.setText(INVALID_INPUT_MESSAGE);
clearText( );

}
} else { //the event source is inputLine

addText(inputLine.getText());
}
}
private void addText(String newline) {
textArea.append(newline + NEWLINE);
inputLine.setText("");
}
private void clearText( ) {
textArea.setText(EMPTY_STRING);
inputLine.setText(EMPTY_STRING);
}
}

[Michael Dunn]

Try this

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class NiceGUI extends JFrame implements ActionListener
{
  private static final int FRAME_WIDTH = 300;
  private static final int FRAME_HEIGHT = 270;
  private static final int FRAME_X_ORIGIN = 150;
  private static final int FRAME_Y_ORIGIN = 250;
  private static final int BUTTON_WIDTH = 80;
  private static final int BUTTON_HEIGHT = 30;
  private static final String EMPTY_STRING = "";
  private static final String NEWLINE = System.getProperty("line.separator");
  private JButton clearButton;
  private JButton addButton;
  private JTextField inputLine;
  private JTextArea textArea;
  public NiceGUI()
  {
    Container contentPane;
    setSize (FRAME_WIDTH, FRAME_HEIGHT);
    setResizable (false);
    setTitle ("Welcome to the Program");
    setLocation (FRAME_X_ORIGIN, FRAME_Y_ORIGIN);
    contentPane = getContentPane( );
    contentPane.setLayout( null );
    contentPane.setBackground( Color.white );
    addButton = new JButton("Display");
    addButton.setBounds(70, 190, BUTTON_WIDTH, BUTTON_HEIGHT);
    contentPane.add(addButton);
    clearButton = new JButton("CLEAR");
    clearButton.setBounds(160, 190, BUTTON_WIDTH, BUTTON_HEIGHT);
    contentPane.add(clearButton);
    clearButton.addActionListener(this);
    addButton.addActionListener(this);
    inputLine = new JTextField();
    inputLine.setBounds(90, 155, 130, 25);
    contentPane.add(inputLine);
    inputLine.addActionListener(this);
    textArea = new JTextArea();
    textArea.setBounds(50, 5, 200, 130);
    textArea.setBorder(BorderFactory.createLineBorder(Color.red));
    textArea.setEditable(false);
    contentPane.add(textArea);
    setDefaultCloseOperation( EXIT_ON_CLOSE );
  }
  final String INVALID_INPUT_MESSAGE = "Re-enter character Please!";
  public void actionPerformed(ActionEvent event)
  {
    char c;
    if (event.getSource() instanceof JButton)
    {
      JButton clickedButton = (JButton) event.getSource();
      if (clickedButton == addButton)
      {
        c = inputLine.getText().charAt(0);
        addText(c);
      }
      else
      {
        textArea.setText(INVALID_INPUT_MESSAGE);
        clearText( );
      }
    }
    else
    {
      //addText(inputLine.getText());
    }
  }
  private void addText(char toConvert)
  {
    textArea.append(toConvert + " = " + (int)toConvert + NEWLINE);
    inputLine.setText("");
  }
  private void clearText( )
  {
    textArea.setText(EMPTY_STRING);
    inputLine.setText(EMPTY_STRING);
  }
  public static void main(String[] args) {new NiceGUI().setVisible(true);}
}

[Mark Phylus]

Thanks Michael Dunn,this really helped.