Thread: Java GUI button calculator

Ok, I have used window in eclipse workspace to build a basic calculator GUI,

I then have the buttons i want to now add onclick events or however you say that in JAVA that when i click it displays for button 1 or bt1 the variable n1 =1 to display in the text field 1.
then on next click 11 then 111
\after that is stored in a variable i would like the then hit say the add button and then add the value of that int.

however im already stuck have the gui sorted but when i try to add variable inside the onlick event i get the error

enclosing scope must be final

protected void createContents() {
		shell = new Shell();
		shell.setSize(260, 260);
		shell.setText("SWT Application");
 
		input = new Text(shell, SWT.BORDER);
		input.setText("input");
		input.setBounds(10, 10, 224, 21);
 
		int n1 = 1;		
		Button bt1 = new Button(shell, SWT.NONE);
		bt1.addSelectionListener(new SelectionAdapter() {
			@Override
			public void widgetSelected(SelectionEvent e) {
			if(n1 == 1){
				input.setText(String.valueOf(n1));
				n1++;
			}
			}
		});

want to add to number 1 button 1 then +10

Sorry, I do not understand your problem. Can you try explaining it again in a different way and perhaps with an example.
If button 1 is bt1 then say that, so there is no confusion.
What does it mean to add to a button? Are you talking about changing the text displayed in the button?

Please edit your post and wrap your code with code tags:

[code]
**YOUR CODE GOES HERE**
[/code]

to get highlighting and preserve formatting.

--- Update ---

the error

enclosing scope must be final

What statement is that error on?

n1 is a local variable in the createContents method. It goes out of scope when execution leaves the method.
Can the variable declaration be moved to the class level so that it stays in scope?