- JOptionPane.showInputDialog("...") - Shows a dialog requesting input from
the user. It always returns String with users input.
- Integer.parseInt( ... ) - It converts String with user input to an
Integer. It is done wrong, because there is no check if User actually
inputs a number. It needs a catch for an exception.
To get a String from a User:
String inputValue = JOptionPane.showInputDialog("Please input a value");
Javadoc:
http://docs.oracle.com/javase/7/docs/api/javax/swing/JOptionPane.html
Tutorial for a JOptionPane:
http://java.sun.com/docs/books/tutorial/uiswing/components/dialog.html
2014-03-24 2:57 GMT+01:00 Jaya <[email protected]>:
> As per the exercise, we have this following code. Can someone explain
> these highlighted lines of code and how do we do this for Strings?
>
> import javax.swing.JOptionPane;
>
> public class GreatestNumber {
> public static void main(String[] args) {
> int[] num = new int[10];
> int counter;
> int max = 0;
> int totalnumber = 3;
>
> // Prompt a user to enter numbers
> for(counter = 0; counter < totalnumber; counter++){
>
> num[counter] = Integer.parseInt
> (JOptionPane.showInputDialog("Enter numbers until " +
> totalnumber + " numbers are entered"));
>
> // Compute the greatest number up to this point
> if((counter == 0)||(num[counter] > max))
> max = num[counter];
> }
>
> // Display the greatest number.
> JOptionPane.showMessageDialog(null,"The number with the greatest
> value is " + max);
> }
>
> }
>
>
> Thanks,
> Jaya
>
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