Hello Ning,
1 and 2 is the syntax for Constructor declaration. Whenever you require an
object of NumWords you will write something like this
NumWords myWord = new NumWords(); *This highlighted code refers the
constructor and sets the initial values for object myWord according to what
you will have in 2.*
3 is syntax for declaration of main method. Just to give you an idea the
application starts from main method. Consider it as entry point.
Happy Coding
G
On Wed, Dec 8, 2010 at 6:34 AM, Ning Yun (运宁) <officesucc...@gmail.com>wrote:
> Hello my teacher and classmates,
>
> I'm studying InputFromKeyboard lesson from Javapassion. I found when
> we use swing classes, we sometimes add a statement "Public classname()
> {}"(as first two example), while we don't do that sometimes(as the
> last example). What is this statement used for? What's the difference
> between using it and not using it?
>
> --------------------------
> 1."public class InputFromKeyboardJOptionPane {
>
> /** Creates a new instance of InputFromKeyboardJOptionPane */
> public InputFromKeyboardJOptionPane() {
> }"
> --------------------------
> 2. "import javax.swing.JOptionPane;
>
> public class NumWords {
>
> /** Creates a new instance of NumWords */
> public NumWords() {
> }"
> ----------------------------
> 3. "import javax.swing.JOptionPane;
>
> public class Grades {
>
> public static void main(String[] args) { "
> --------------------------------
>
> Thank you very much in advance.
>
> Best regards,
> Ning
>
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