What does showInputDialog return?

Question

I work on a project in Java for school, and I have a problem with JOptionPane.showInputDialog().

My question is: What does JOptionPane.showInputDialog() return if I enter nothing into the field and then hit "OK"?

I tried to find it out by myself with this test-code:

public static void main(String[] args) {
    String test = JOptionPane.showInputDialog("Please enter:");
    if (test==""){
        System.out.println("Found it");
    }else{
        System.out.println(test);
    }
}

This doesn't work, as I said. It will print out the variable test, instead of the string "Found it".

What must I enter in the if-query in case I enter nothing in the field and then hit 'OK'?

Excuse my English, I'm Swiss.

it returns user's input, or null meaning the user canceled the input — raven, May 06 '16 at 15:13
Indeed, the output will be the empty String `""` , the problem is how you compare the Strings . — Arnaud, May 06 '16 at 15:16

score 0 · Answer 1 · edited May 06 '16 at 17:17

0

try this

    public static void main(String[] args) {
        String test = JOptionPane.showInputDialog("Please enter:");
        if (test==null){
            System.out.println("Found it");
        }else{
            System.out.println(test);
        }
    }

edited May 06 '16 at 17:17

Mostafiz

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answered May 06 '16 at 15:08

Joey

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What does showInputDialog return?

1 Answers1