Java compiling error when passing values between classes

Question

I'm trying to pass a JTEXTFIELD value I created in class 2 to class 3. My terminal when compiling shows me this:

error: incompatible types
        username = class2.username;

My code structure is this.

    class 1
    - has main
    -class2 c2 = new class2

    class 2 (extends JFrame)
    - JTextField username = new JTextField("", 15);
    -method gui here
    -method actionlistener here
       if e.getsource == submit
          class3 c3 = new class3
          c3.connection();

class 3
-method connection
-string username declared here
- username = class2.username

How can i get the value from class 2 into class 3?

right so what do I do? get the value of the textfield then pass to string? — lecardo
– lecardo, Commented Mar 30, 2014 at 23:32
cheers for that. Wasn't aware you could use another . in a statement. Isit possible to give comments "best answer" ? — lecardo
– lecardo, Commented Mar 30, 2014 at 23:34

Nico · Accepted Answer · 2014-03-30 23:37:24Z

1

You were getting the error because you are assigning JTextField to a String which would result in incompatible types error.

To be able to get the value of JTextField you have to use the getText() method like so:

username = class2.username.getText();

getText() returns a String which you can then assign to any String you like.

Here is the documentation for getText(): http://docs.oracle.com/javase/7/docs/api/javax/swing/text/JTextComponent.html#getText()

answered Mar 30, 2014 at 23:37

Nico

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2 Comments

lecardo Over a year ago

THats actually not working. No data gets passed? Any idea why? I did a system out on class 2 and it showed my data but in class 3 nothing was displayed on system.out

Nico Over a year ago

@Bobski It is difficult to tell what's going on without seeing the code but I would assume your problem has to do with initialization order. Check this out: norvig.com/java-iaq.html#init and also docs.oracle.com/javase/specs/jls/se7/html/jls-12.html#jls-12.4 to understand that.

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