HELP!How to show # and * in the textfield

Question

I am trying to show a # and * in the textfield in this telephone keypad interface. What's wrong with my coding? How can I show # and *? Whenever I press # and * on the keypad I get a Null or Infinity statement, when I just want # and * to show up instead. I had converted a calculator applet into a telephone applet to make into an keypad interface.
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
public class TelephoneApplet extends Applet implements ActionListener
private Button keysArray[];
private Panel keyPad;
private TextField lcdField;
private double result;
private boolean first;
private boolean foundKey;
static boolean clearText;
private int prevOperator;
public void init()
lcdField = new TextField(20);
keyPad = new Panel();
keysArray = new Button[12];
first = true;
result = 0.0;
clearText = true;
prevOperator = 0;
setBackground(Color.magenta);
lcdField.setEditable(false);
for ( int i=0; i<=9; i++ )
keysArray[ i ] = new Button(String.valueOf(i));
keysArray[10] = new Button( "*" );
keysArray[11] = new Button( "#" );
// set keyPad layout to grid layout
keyPad.setLayout(new GridLayout(4,3,10,10));
for ( int i=1; i<=9; i++ ) //adds buttons 1-9 to Panel
keyPad.add( keysArray[i] );
/* for (int i = 4; i <= 6; i++) //adds buttons 4, 5, and 6 to Panel
keyPad.add( keysArray[i] );
for (int i = 7; i <= 9; i++) //adds buttons 7, 8, 9, and divide to Panel
keyPad.add( keysArray[i] );
keyPad.add( keysArray[10] ); //adds star button to Panel
keyPad.add( keysArray[ 0 ] ); //adds 0 key to Panel
keyPad.add( keysArray[11] ); //adds infinity button to Panel
for (int i = 10; i >= 11; i--)
keyPad.add( keysArray[i] ); //adds keys to Panel
setLayout(new BorderLayout());
add( lcdField, BorderLayout.NORTH );
add( keyPad, BorderLayout.CENTER );
for(int i = 0; i < keysArray.length; i++)
keysArray.addActionListener(this);
public void actionPerformed( ActionEvent e)
foundKey = false;
//Search for the key pressed
for (int i = 0; i < 12 && !foundKey; i++)
if(e.getSource() == keysArray[i]) //key match found
foundKey=true;
switch(i)
case 0: case 1: case 2: case 3: case 4: //number buttons
case 5: case 6: case 7: case 8: case 9:
          //0 - 9
if(clearText)
lcdField.setText("");
clearText = false;
lcdField.setText(lcdField.getText() + keysArray[i].getLabel());
break;
case 10:
case 11:
clearText = true;
if (first) // first operand
if(lcdField.getText().length()==0)
result = 0.0;
else
result = Double.parseDouble(lcdField.getText());
first = false;
prevOperator = i;
else //second operand already entered, so calculate total
switch(prevOperator)
case 10: //divide button
result /= Double.parseDouble(lcdField.getText());
break;
case 11: //multiply button
result *= Double.parseDouble(lcdField.getText());
break;
lcdField.setText(Double.toString(result));
if(i==14) //equal button
first = true;
else
prevOperator = i; //save last operator
break;

Answer 1

you need to change the following piece of code
case 10:   // * pressed
case 11:   // # pressed
clearText = true;
if (first) // first operand
if(lcdField.getText().length()==0)
result = 0.0;
else
result = Double.parseDouble(lcdField.getText());
first = false;
prevOperator = i;
else //second operand already entered, so calculate total
switch(prevOperator)
case 10: //divide button
result /= Double.parseDouble(lcdField.getText());
break;
case 11: //multiply button
result *= Double.parseDouble(lcdField.getText());
break;
lcdField.setText(Double.toString(result));
if(i==14) //equal button
first = true;
else
prevOperator = i; //save last operator
break;
}its gets excuted when you press the * or # buuton