Hello, I need help on this project for school.
My instructions are "Write a program called OfficeAreaCalculator.java that displays the following prompts using two label components:

Enter the length of the office:
Enter the width of the office:

Have your program accept the user input in two text fields. When a button is clicked, your program should calculate the area of the office and display the area in a text field. This display should be cleared whenever the input text fields receive the focus. A second button should be provided to terminate the application (Exit button)."

and here is my code

/**
 * 
 */
package officeAreaCalculator;

import java.text.*;
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
/**
 * @author Kevin
 *
 */
public class OfficeAreaCalculator extends JFrame {
	private JFrame mainFrame;
	private JButton calculateButton;
	private JButton exitButton;
	private JTextField lengthField;
	private JTextField widthField;
	private JTextField areaField;
	private JLabel lengthLabel;
	private JLabel widthLabel;
	private JLabel areaLabel;
	private ActionListener chandler;
	private ActionListener ehandler;
	
	
	
	
	/**
	 * 
	 */
	public OfficeAreaCalculator() {
		mainFrame = new JFrame("Office Area Calculator");
		
		calculateButton = new JButton("Calculate area");
		exitButton = new JButton("Exit");
		lengthLabel = new JLabel("Enter the length of the office:");
		widthLabel = new JLabel("Enter the width of the office:");
		areaLabel = new JLabel("Office area:");
		lengthField = new JTextField(5);
		widthField = new JTextField(5);
		areaField = new JTextField(5);
		
		Container c = mainFrame.getContentPane();
		
		c.setLayout(new FlowLayout());
		
		c.add(lengthLabel);
		c.add(lengthField);
		c.add(widthLabel);
		c.add(widthField);
		c.add(areaLabel);
		c.add(areaField);
		c.add(calculateButton);
		c.add(exitButton);
		
		calculateButton.setMnemonic('C');
		exitButton.setMnemonic('x');
		
		mainFrame.setSize(250,150);
		
		mainFrame.addWindowListener(new WindowAdapter()
		{
			public void windowClosing(WindowEvent e) {System.exit(0);}
		});
		
		calculateButtonHandler.chandler = new calculateButtonHandler();
		calculateButton.addActionListener(chandler);
		
		ExitButtonHandler.ehandler = new ExitButtonHandler();
		exitButton.addActionListener(ehandler);
		
		FocusHandler fhandler = new FocusHandler();
		lengthField.addFocusListener(fhandler);
		widthField.addFocusListener(fhandler);
		areaField.addFocusListener(fhandler);
		
		mainFrame.show();
		
	}
	
	class calculateButtonHandler implements ActionListener
	{
		public static calculateButtonHandler chandler;

		public void actionPerformed(ActionEvent e)
		{
			DecimalFormat num = new DecimalFormat(",###.##");
			double width;
			double length;
			double area;
			String instring;
			
			instring = lengthField.getText();
			if (instring.equals(""))
			{
				instring = "0";
				lengthField.setText("0");
			}
			length = Double.parseDouble(instring);
			
			instring = widthField.getText();
			if (instring.equals(""))
			{
				instring = "0";
				widthField.setText("0");
			}
			width = Double.parseDouble(instring);
			area = length * width;
			areaField.setText(num.format(area));
		}
	}

	class ExitButtonHandler implements ActionListener
	{
		public static ExitButtonHandler ehandler;

		public void actionPerformed(ActionEvent e)
		{
			System.exit(0);
		}
	}
	
	class FocusHandler implements FocusListener
	{
		public void focusGained(FocusEvent e)
		{
			if(e.getSource() == lengthField || e.getSource() == widthField)
			{
				areaField.setText("");
			}
			else if (e.getSource() == areaField)
			{
				areaField.setNextFocusableComponent(calculateButton);
				calculateButton.grabFocus();
			}
		}
	
	public void focusLost(FocusEvent e)
	{
		if(e.getSource() == widthField)
		{
			widthField.setNextFocusableComponent(calculateButton);
		}
	}
	
	
	
	}
	
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		new OfficeAreaCalculator();
	}

}

my problem is that I can't get the error
"The field chandler cannot be declared static; static fields can only be declared in static or top level types"

I'm unsure how to correct this, can anyone help me here?

This part of the code

class calculateButtonHandler implements ActionListener
	{
		public static calculateButtonHandler chandler;

is declaring an inner class, which cannot have static types.

Declare this class outside of the class definition for OfficeAreaCalculator.

P.S. Not that I think that that is the only problem with your code, but then again, I didn't really even look at it.

Thanks,
I got it - here it is

//calculateButtonHandler.chandler = new calculateButtonHandler();

calculateButton.addActionListener(new calculateButtonHandler());

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