declaring a "final" variable?

Hi, I need help with my homework.

I'm getting an error along the lines of "local variable names needs to be declared final", first in line 50.

Code :

// Author: Blake Needleman
 
import javax.swing.*;
import java.awt.*; 
import java.awt.event.*;
 
public class HW9_2 extends JFrame {
	private JLabel user = new JLabel("Username:");
	private JTextField username = new JTextField("");
	private JLabel pass = new JLabel("Password:");
	private JTextField password = new JTextField("");
	private JLabel in = new JLabel("Logged in.");
	private JLabel notIn = new JLabel("Not logged in.");
	private JButton login = new JButton("Login");
	private JButton logout = new JButton("Logout");
 
 
	public static void main(String[] args) {
		HW9_2 myFrame = new HW9_2(); 
    	myFrame.setVisible(true);
    	myFrame.setTitle("Login");
    	myFrame.setSize(300, 200);
    	myFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
 
 
	public HW9_2() {
		setLayout(new GridLayout(3, 2, 5, 5));
		add(user);
		add(username);
		add(pass);
		add(password);
		add(notIn);
		add(login);
 
		String[] names;
		names = new String[2];
		names[0] = "Ann";
		names[1] = "Bob";
		String[] codes;
		codes = new String[2];
		codes[0] = "apple";
		codes[1] = "blueberry";
 
		login.addActionListener(new ActionListener() { 
      	public void actionPerformed(ActionEvent e) { 
			String name = username.getText();
			String passWord = password.getText();
			int winning_position;
 
			for (int i = 0; i < names.length; i ++) {
				if(name.equals(names[i])) {
					winning_position = i;
				}
			}
 
			if (passWord.equals(code[winning_position])) {
				login.setText(logout + "");
				notIn.setText(in + "");
			}
 
		}
 
 
		});
 
	}
}

Any ideas?