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Thread: declaring a "final" variable?

  1. #1
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    Default 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.


    // 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?


  2. #2
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    Default Re: declaring a "final" variable?

    You're trying to access a local variable within an anonymous inner class.

    Either Initialise String[] names as an instance variable or say:
    final String[] names;

    Hope this helped.

    Edit: Didn't see post date :L
    Last edited by newbie; November 26th, 2010 at 06:57 PM. Reason: Better wording

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