JFields,variables, declaration, access

[Ike]

Ok, let's say I have a simple Window with 1 text field and a button. Diagram:


class Window{

constructor Window{
JTextFiled name("nomine")
JButon button("store")
button.addActionListener(handler)
}

class Handler implements actionListener{...}
// triggered when 'store' button is pressed


}




If I try to store the values from JTextField directly in constructor I get only "nomine" stored, because obviously, it is jet to be filled.

If I try to access it from another method in the Window class, let's say getNames(), I get an error 'cannot find symbol: variable name'.

1. How am I supposed to access these variables?
2. What should I use if I want to input numers (birthyear, height...) ?

[yellowledbet]

It is not accessible to the other methods because it is declared within the constructor. If you want access to a variable in more than one method you must declare it outside of the method.

[Ike]

Oh, great, thanx :) So I've made :

class Window{
public static String[] textData = new String[3];

constructor Window{...}

class actionListener{...
textData[0]=JTF1.getText();
textData[1]=JTF2.getText();
textData[2]=JTF3.getText();
//some method from other class...whatever
}

}
So, when I press the button ("store") the values are copied from text fields into 'textData' array. Only then is action performed.
I can access that array from all the methods of the Window class, and even from other classes within the package :)
(correct me if I'm wrong)


So, how do I involve numbers here?
Should I somehow transform 'String to Double' or use different kind of 'input fields' ?

[Junky]

Anything entered into a textfield is text. If you enter the digit 3 then it will be the String "3" and not the int 3. So storing it into your array is fine unless you actually want the int 3 to do some math with it. In that case you need to parse the String into an int.

[Ike]

Ok, and after parsing String into Int, when I use that Int in the equation with at least one Double, it will be 'seen' as a Double?


This works for importing numbers from text fields into integer array:
numberData[2]=Integer.parseInt(JTF1.getText());

[Junky]

If you want the value as a double then parse it as a double instead of an int.

[Ike]

Oh, stupid me.
Ok, now I know how to input Strings, Ints and Doubles, and how to manipulate them from various methods. Thanx guys.
Have enough material to play for a week :) See you when next problem occurs.

[DarrylBurke]

constructor Window{...}

Huh? This is a Java forum, are you sure you're in the right place?

db