LinuxQuestions.org - reading JOptionPane when cancel is hit

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reading JOptionPane when cancel is hit

Sorry for asking a question i could probably find in the api, but i gotta get some sleep before class tomorrow!!

Im trying find out how i could find out if the cancel button is hit in JOptionPane. does it give a null?

like if i was to do the following

String someText =JOptionPane.showInputDialog(null, "enter some stuff");

and the cancel button was hit how would i know?

thanks

Yeah, it will return null if you click cancel. If you click OK without typing anything, then you will get an empty String, which is not null. Test this:

Code:

import javax.swing.*;



public class MainClass {



    public static void main(String[] args) {



        String someText = JOptionPane.showInputDialog(null, "Enter some stuff");

        System.out.println(someText);



        if (someText != null) {

            System.out.println("You've entered: " + someText);

        } else {

            System.out.println("someText was null");

        }



    }

}

Quote:

Originally Posted by Mega Man X

Yeah, it will return null if you click cancel. If you click OK without typing anything, then you will get an empty String, which is not null. Test this:

Code:

import javax.swing.*;



public class MainClass {



    public static void main(String[] args) {



        String someText = JOptionPane.showInputDialog(null, "Enter some stuff");

        System.out.println(someText);



        if (someText != null) {

            System.out.println("You've entered: " + someText);

        } else {

            System.out.println("someText was null");

        }



    }

}

Thing is that

String someText = JOptionPane.showInputDialog(null, "hit cancel");

!=null

or better put

String st1, st2;

st1 = new String("null"); //which is how JOptionPane will store it
st2 = new String(null);

st1 != st2

which is what im trying to get arround.