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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