confirm dialog not

[Marius Constantin]

Hello Experts !

I have this piece of code down below. What I am confused about is why, when the confirmation dialog box appears and I click on the No button, the JVM exits the loop and displays the sum of numbers, but when I select this button using the tab key, the JVM considers this input as YES_OPTION, and the code reacts to this option accordingly.

Thank you so so much !

/*
 * This program will use a confirmation box to control a loop witch controls flow of numbers
 * from the keyboard. until the no button is pressed, the app will continue to add the numbers.
 * When no will be pressed, the app will display the sum.
 */
 
import javax.swing.JOptionPane;

public class SentinelValueUsingConfirmationDialog{

	public static void main(String args[]){
	
		int sum = 0;
		
		int data = 0;
		
		int option = JOptionPane.YES_OPTION;
		
		String dataString = "";
		
		while (option == JOptionPane.YES_OPTION){
		
			dataString = JOptionPane.showInputDialog(
				"Enter an int value : ");
			
			data = Integer.parseInt(dataString);
			
			sum += data;
			
			option = JOptionPane.showConfirmDialog(null, "Continue?");
		}
		
		JOptionPane.showMessageDialog(null, "The sum is " + sum);
	}
 }

[Campbell Ritchie]

I tried some similar code and couldn’t reproduce your error. Now, yes = 0, no = 1 and cancel = 2, which is exactly what I got by running this little program:

public class OptionDemo
{
    public static void main(String[] args)
    {
        java.util.Scanner inScan = new java.util.Scanner(System.in);
        int i;
        do
        {
            System.out.printf("That option was %d%nEnter a positive number to continue: ",
                    javax.swing.JOptionPane.showConfirmDialog(null, "Continue?"));
        }
        while((i = inScan.nextInt()) > 0);
    }
}

I suggest you put some debugging print statements into that method, and see what you get.

[Michael Dunn]

the optionPanes have a default button (react to enter key), generally yes/ok/whatever
so even though you've tabbed to 'no' and that button has focus (the dotted square around the text),
hitting enter will fire the default button = ok/yes/whatever.

to fix, add this line as the first line of the program

javax.swing.UIManager.put("Button.defaultButtonFollowsFocus", Boolean.TRUE);

[Marius Constantin]

Thank you very much Ritchie Michael for your detailed answers, it helps a lot a greenhorn. we are luck to have you !

I have tried putting this piece of code

 import javax.swing.UIManager.put("Button.defaultButtonFollowsFocus", Boolean.TRUE); 

on first line of the program as instructed, but it gives me this error :

[error message]

error: ';' expected
import javax.swing.UIManager.put("Button.defaultButtonFollowsFocus", Boolean.TRUE);

[/error message]

in this message the ^ sign points out to the bracket (

this is my version of Java

java version "1.7.0"
Java(TM) SE Runtime Environment (build pwi3270-20110906_01)
IBM J9 VM (build 2.6, JRE 1.7.0 Windows Server 2003 x86-32 20110810_88604 (JIT enabled, AOT enabled)
J9VM - R26_Java726_GA_20110810_1208_B88592
JIT - r11_20110810_20466
GC - R26_Java726_GA_20110810_1208_B88592
J9CL - 20110810_88604)
JCL - 20110809_01 based on Oracle 7b147

and here is the code again, maybe I did something wrong.

Please advice,
marius

/*
 * This program will use a confirmation box to control a loop witch controls flow of numbers
 * from the keyboard. until the no button is pressed, the app will continue to add the numbers.
 * When no will be pressed, the app will display the sum.
 */

import javax.swing.UIManager.put("Button.defaultButtonFollowsFocus", Boolean.TRUE);  
import javax.swing.JOptionPane;

public class SentinelValueUsingConfirmationDialog{

	public static void main(String args[]){
	
		int sum = 0;
		
		int data = 0;
		
		int option = JOptionPane.YES_OPTION;
		
		String dataString = "";
		
		while (option == JOptionPane.YES_OPTION){
		
			dataString = JOptionPane.showInputDialog(
				"Enter an int value : ");
			
			data = Integer.parseInt(dataString);
			
			sum += data;
			
			option = JOptionPane.showConfirmDialog(null, "Continue?");
		}
		
		JOptionPane.showMessageDialog(null, "The sum is " + sum);
	}
 }

[Paul Clapham]

You should use what Michael said you should use. And realizing that it's executable code, you would naturally put it as the first executable statement.

[Randall Twede]

import javax.swing.UIManager.put("Button.defaultButtonFollowsFocus", Boolean.TRUE);

you need to break that up. the compiler is trying to tell you an import statement is just that.

import javax.swing.UIManager;

then inside your main()

UIManager.put("Button.defaultButtonFollowsFocus", Boolean.TRUE);