Tom Never

Thanks. I'm still learning my way around packages/api documentation. It's amazing what they don't tell you.

I am reading the sun tutorial and I don't see in this code where the 2nd addActionListener is in the code for both the enter and button. They write in the tutorial:

We want to perform the conversion when the user clicks the button or presses Enter in the text field. To do so, we add an action event listener to the convertTemp button and tempCelsius text field.

convertTemp.addActionListener(this);
tempCelsius.addActionListener(this);
...

But I don't see it in the code. It works, for both button and enter, but where is it in the code? Thanks, Tom

[I]/** * CelsiusConverter.java is a 1.4 application that * demonstrates the use of JButton, JTextField and * JLabel. It requires no other files. */ import java.awt.*; import java.awt.event.*; import javax.swing.*; public class CelsiusConverter implements ActionListener { JFrame converterFrame; JPanel converterPanel; JTextField tempCelsius; JLabel celsiusLabel, fahrenheitLabel; JButton convertTemp; public CelsiusConverter() { //Create and set up the window. converterFrame = new JFrame("Convert Celsius to Fahrenheit"); converterFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); converterFrame.setSize(new Dimension(120, 40)); //Create and set up the panel. converterPanel = new JPanel(new GridLayout(2, 2)); //Add the widgets. addWidgets(); //Set the default button. converterFrame.getRootPane().setDefaultButton(convertTemp); //Add the panel to the window. converterFrame.getContentPane().add(converterPanel, BorderLayout.CENTER); //Display the window. converterFrame.pack(); converterFrame.setVisible(true); } /** * Create and add the widgets. */ private void addWidgets() { //Create widgets. tempCelsius = new JTextField(2); celsiusLabel = new JLabel("Celsius", SwingConstants.LEFT); convertTemp = new JButton("Convert"); fahrenheitLabel = new JLabel("Fahrenheit", SwingConstants.LEFT); //Listen to events from the Convert button. [B]convertTemp.addActionListener(this);[/B] //Add the widgets to the container. converterPanel.add(tempCelsius); converterPanel.add(celsiusLabel); converterPanel.add(convertTemp); converterPanel.add(fahrenheitLabel); celsiusLabel.setBorder(BorderFactory.createEmptyBorder(5,5,5,5)); fahrenheitLabel.setBorder(BorderFactory.createEmptyBorder(5,5,5,5)); } public void actionPerformed(ActionEvent event) { //Parse degrees Celsius as a double and convert to Fahrenheit. int tempFahr = (int)((Double.parseDouble(tempCelsius.getText())) * 1.8 + 32); fahrenheitLabel.setText(tempFahr + " Fahrenheit"); } /** * Create the GUI and show it. For thread safety, * this method should be invoked from the * event-dispatching thread. */ private static void createAndShowGUI() { //Make sure we have nice window decorations. JFrame.setDefaultLookAndFeelDecorated(true); CelsiusConverter converter = new CelsiusConverter(); } public static void main(String[] args) { //Schedule a job for the event-dispatching thread: //creating and showing this application's GUI. javax.swing.SwingUtilities.invokeLater(new Runnable() { public void run() { createAndShowGUI(); } }); } }[/I]

I've been working through Head First, and on Chapter 4 now. My question is: Do other readers of this book figure out the answers in their head? or by scribbling on paper? I have to type in the program and run it for results. Am I just not understanding what is going on in the programs?
signed,
slow learner

yay! that was it. thanks.

My path statement for windows XP has jdk1.5.0_06\bin That's where java.ex exits, I wouldn't put in the java.exe either.
Tom

C:\Program Files\Java\jdk1.5.0_06\scr.zip;C:\Program Files\Java\jdk1.5.0_06\javac.exe;C:\Program Files\Java\jdk1.5.0_06\java.exe

I've also tried with the same lines but unnaming files (finishing with '\')

What am I doing wrong?

Thank you very much for your attention and help.
Merry Christmas and Happy New Year!!

And I hope the Three Wise Men bring you everything!! [/QB]

I hand typed in the page 14 script for "99 bottles of beer" and it won't compile, says line 9(While (beerNum > 0) is wrong. What did I do wrong?
thanks,
Tom

C:\Documents and Settings\3441\My Documents\working_java>javac BeerSong.java
BeerSong.java:9: ';' expected
{
^
1 error

C:\Documents and Settings\3441\My Documents\working_java>

here is what I typed in:
public class BeerSong
{
public static void main (String[] args)
{
int beerNum = 99;
String word = "bottles";

While (beerNum > 0)
{

if (beerNum == 1)
{
word = "bottle"; // singular as in one bottle
}
System.out.println(beerNum + " " + word + " of beer on the wall");
System.out.println(beerNum + " " + word + " of beer");
System.out.println("Take one down.");
System.out.println("pass it around.");
beerNum = beerNum - 1;

if (beerNum > 0)
{ System.out.println(beerNum + " " + word + " of beer on the wall");
}
else
{
System.out.println("No more bottles of beer on the wall");
} //end else
} // end while loop
} //end main method
} //end class

I just bought the book, and am only on page 14. And am having problems with 99 bottles of beer on the wall, which I will post separately.
Tom

Originally posted by Stuart Goss:
[QB]Hi there!

Is anybody on this forum reading the "Head First Java" book by Ms. Sierra and Mr. Bates currently?