What's wrong with my compiler?

[Kid Programmer]

Hello guys. I have a question. What's wrong with my compiler. In a simple number averaging program in a GUI window have way into the project I compile the program and I get the following errors:

Severity and Description Path Resource Location Creation Time Id
The local variable average is never read NumberAveragerG UI/src/NumberAverager NumberAverager. java line 19 1211932107534 648
The local variable calculate_avera ge is never read NumberAveragerG UI/src/NumberAverager NumberAverager. java line 17 1211932107534 647
The local variable contentPane is never read NumberAveragerG UI/src/NumberAverager NumberAverager. java line 12 1211932107534 644
The local variable num1 is never read NumberAveragerG UI/src/NumberAverager NumberAverager. java line 14 1211932107534 645
The local variable num2 is never read NumberAveragerG UI/src/NumberAverager NumberAverager. java line 15 1211932107534 646


Here is my code:

package NumberAverager;

import javax.swing.*;
import java.awt.*;

public class NumberAverager {
	
	public static void main(String[] args) {
		//declare variables
		JFrame frame;
		FlowLayout layout;
		Container contentPane;
	
		JTextField num1;
		JTextField num2;
		
		JButton calculate_average;
		
		JLabel average;
		
		//create a new JFrame and set it's title
		frame = new JFrame();
		frame.setTitle("Number Averaging Program");
		
		//create a new container
		contentPane = frame.getContentPane();
		
		//create and apply a layout
		layout = new FlowLayout();
		frame.setLayout(layout);
		
		//create components
		num1 = new JTextField("Number 1");
		num2 = new JTextField("Number 2");
		
		calculate_average = new JButton("Calculate average");
		
		average = new JLabel("Average");
		
		//frame settings
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.pack();
		frame.setVisible(true);
	}
}

[Laharl]

You never add any of the widgets you create to the contentPane. I realize this is code in progress, but I think that's your problem.

[Kid Programmer]

You never add any of the widgets you create to the contentPane. I realize this is code in progress, but I think that's your problem.

Thanks. That worked :-)

[JosAH]

Lesson learned: there is nothing wrong with the compiler. If a compiler complains
about something you can be darn sure that the fault is in your code, not the
compiler's code. Most if not all nowadays' compilers are generated by parser-
and code-generators; these things either utterly fail on the first attempt to set
them to work or they simply work. So if a compiler complains: check your code.

kind regards,

Jos

[Kid Programmer]

I said number averaging program but I accidently made a calculator. Woops.

[JosAH]

I said number averaging program but I accidently made a calculator. Woops.

That is called: bad design.

kind regards,

Jos

[Kid Programmer]

That is called: bad design.

kind regards,

Jos

LOL And I thought something was wrong with my compiler because I thought the variables had been read because I declared them.