Slick2d | TextField character passing

Question

The problem:

I wrote some GUI stuff (a button) for my game. But Im stuck at creating the TextField, becouse the KeyListener is not working. I tried to implement the KeyListener but did not work.
What should I do?

Links:

The game (finished)

The code:

public class TextField extends GUI implements KeyListener {
    private boolean focused = false;
    private String text = "";

    public TextField(int x, int y, int width, int height) {
        super(x, y, width, height);
    }

    public boolean isFocused() {
        return focused;
    }

    public void setFocused(boolean focused) {
        this.focused = focused;
    }

    public void append(String text) {
        this.text = this.text + text;
    }

    public void delete() {
        if (text.length() > 0) {
            text = text.substring(0, text.length() - 1);
        }
    }

    @Override
    public void render(GameContainer gc, Graphics g) {
        if (!focused) {
            g.setColor(Color.gray);
        } else {
            g.setColor(Color.orange);
        }
        g.fillRect(x - width / 2, y - height / 2, width, height);

        g.setColor(Color.darkGray);
        g.fillRect(x - width / 2 + 5, y - height / 2 + 5, width - 10, height - 10);

        g.setColor(Color.white);
        g.drawString(text, x - g.getFont().getWidth(text) / 2, y - g.getFont().getHeight(text) / 2);
    }

    @Override
    public void setInput(Input input) {
    }

    @Override
    public boolean isAcceptingInput() {
        return false;
    }

    @Override
    public void inputEnded() {
    }

    @Override
    public void inputStarted() {
    }

    @Override
    public void keyPressed(int i, char c) {
        System.out.println("This is not working");
    }

    @Override
    public void keyReleased(int i, char c) {
    }
}

This is how I create a TextField:

ipField = new TextField(width / 2, height / 2 - 60, 200, 50);
ipField.add(new ActionHandler() {
    @Override
    public void pressed() {
        ipField.setFocused(true);
    }

    @Override
    public void hover() {
    }

    @Override
    public void notHover() {
        if (input.isMousePressed(0)) {
            ipField.setFocused(false);
        }
    }
});
guiManager.add(ipField);

**I found out, I can use a built in TextField for this:*

org.newdawn.slick.gui.TextField

Answer 1

Referring to JavaDoc, KeyListener methods have the following syntax:

void keyPressed(KeyEvent e)
void keyReleased(KeyEvent e)
void keyTyped(KeyEvent e)

Going over your code, your syntax are:
public void keyPressed(int i, char c)
public void keyReleased(int i, char c)

This will be flagged as an error at compilation time.

Also, you should, ideally, create a separate handler class for your events.
TextField is the object that will generate the event and there must be someone to listen to it. You need to specify who will listen by calling the addKeyListener() method and passing the handler class' object as an argument.

PS: Switch to Swing. Use JTextField instead

Refer: http://docs.oracle.com/javase/6/docs/api/java/awt/event/KeyListener.html
Tutorial: http://docs.oracle.com/javase/tutorial/uiswing/events/keylistener.html
Event delegation model: http://wiki.answers.com/Q/What_is_delegation_event_model_in_java
Advantages of swing: https://softwareengineering.stackexchange.com/questions/112482/advantage-of-using-swing-over-awt