Initialize Button Different class in java

Asked Dec 09 '15 at 14:30

Active Jun 09 '16 at 15:28

Viewed 36 times

I got a problem when I build a class to use its own module like VB.net, because I don't want to initialize the Button's Label and TextField a lot of line in everyday, but I got an error when button didn't initialize it.

When I try to build the program below, I get the following error:

Exception in thread "main" java.lang.NullPointerException at java.awt.Container.addImpl(Unknown Source) at java.awt.Container.add(Unknown Source) at EmployeeGUI.AddLayout(EmployeeGUI.java:57) at EmployeeGUI.(EmployeeGUI.java:28) at EmployeeGUI.main(EmployeeGUI.java:89)

Here is class code:

import java.awt.Button;
    public class Init{
        public static void initButton(String btntxt,Object...btn){
            String[] btnT = btntxt.split("\\\,");
            for (int i = 0; i < btn.length; i++) {
                btn[i] = new Button(btnT[i]);
            }
        }
   }

edited Jun 09 '16 at 15:28

MKII

asked Dec 09 '15 at 14:30

Seakleng Say

1

what is `EmployeeGUI` – Madhawa Priyashantha Dec 09 '15 at 14:36
Code in main class for call :
Init.initButton("Add,Clear,Exit",btnAdd,btnClear,btnExit); – Seakleng Say Dec 09 '15 at 14:41
1

this error is not relevant for the code you posted. what is the 28th line of EmployeeGUI.java – Madhawa Priyashantha Dec 09 '15 at 14:42
sorry i cannot add this this page said it too long but the method for call is Init.initButton("Add,Clear,Exit",btnAdd,btnClear,btnExit); – Seakleng Say Dec 09 '15 at 14:48
post relavant codes. use pastebin for additional codes. – Madhawa Priyashantha Dec 09 '15 at 14:50
aw sorry i dont know how to do it – Seakleng Say Dec 09 '15 at 14:55
http://pastebin.com/ post additional codes and give us the link – Madhawa Priyashantha Dec 09 '15 at 14:57
http://pastebin.com/vujReQVU – Seakleng Say Dec 09 '15 at 15:00
in Init class String[] btnT = btntxt.split("\\,"); this \\ have only 2 – Seakleng Say Dec 09 '15 at 15:03
you never initialize `lblGender` so it's null you are adding null to a panel?? – Madhawa Priyashantha Dec 09 '15 at 15:10
aw i just delete it when i cannot update to this page . i debug the button already that parse to Init class is class cannot initialize . i want to parse button with pointers but java didn't allow us to use pointer =.= – Seakleng Say Dec 09 '15 at 15:16
you haven't initialize `lblGender,btnAdd....` .for example you have initialize pnlgender panel using `pnlGender = new Panel(new FlowLayout());`you have initialize .but where have you intialize `lblGender` ?? .see my answer – Madhawa Priyashantha Dec 09 '15 at 15:21
=.=" aw i want to build module like Vb.net . u didnt get my point – Seakleng Say Dec 09 '15 at 15:30
that's because of java pass by value not reference – Madhawa Priyashantha Dec 09 '15 at 15:35
read http://www.javaranch.com/campfire/StoryPassBy.jsp – Madhawa Priyashantha Dec 09 '15 at 15:43
thank bro . now ,i solve it already. – Seakleng Say Dec 09 '15 at 16:03
excactly, java didn't allow us to use pointer so i need to make button to array class and pass that . finish – Seakleng Say Dec 09 '15 at 16:58
And Null is Button that i want to initialize in other class but cannot get Data back in Main Class – Seakleng Say Dec 09 '15 at 17:03

Initialize Button Different class in java

0 Answers0