CODEWITHSUNDEEP
javaswingobjectkeylistenerkeyevent
user3045711
user3045711

Reputation:

Java event.getKeyCode error

So I am making this game. It is a ball bouncing around so far. But I want to add a purpoise of the game. So I added this Pad that I want the user to be able to move around. I searched around and couldn't find a good example how to use keyevents. Anyway, this is my code for the pad.

import java.awt.*;
import javax.swing.*;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.EventQueue;


public class MainFrame extends JPanel implements Runnable {

    int diaPad = 120;
    long delay = 20;
    private int xx = 120;
    private int yy = 670;
    private int dxx = 6;

protected void paintComponent(Graphics g){
    super.paintComponent(g);
    Graphics2D g2 = (Graphics2D)g;
    g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                        RenderingHints.VALUE_ANTIALIAS_ON);

    g.setColor(Color.BLACK);
    g.fillRect(xx,yy,120,15);

} 
public void run() {
    while(isVisible()) {
        try {
            Thread.sleep(delay);
        } catch(InterruptedException e) {
            System.out.println("interrupted");
        }
        repaint();
    }
}    
public void movePadRight() {
        if(xx + dxx < 0 || xx + diaPad + dxx > getWidth()) {
             dxx *= -1;
        }
        xx += dxx;

}
public void movePadLeft(){

        if(xx + dxx < 0 || xx + diaPad + dxx > getWidth()) {
             dxx *= -1;
        }
        xx -= dxx;

}

public void keyBoard(KeyEvent e){
   if (event.getKeyCode() == KeyEvent.VK_LEFT) {
        movePadLeft();
   }
    if (event.getKeyCode() == KeyEvent.VK_RIGHT) {
        movePadRight();
        }
    }
}

I don't see any errors in the code but when I compile the program, I get this

MainFrame.java:79: cannot find symbol symbol : variable event location: class MainFrame if (event.getKeyCode() == KeyEvent.VK_RIGHT) { ^

Upvotes: 1

Views: 3029

Answers (3)

Reimeus
Reimeus

Reputation: 159754

The KeyEvent variable is defined as e

if (e.getKeyCode() == KeyEvent.VK_LEFT) {

Note: Use key bindings instead for handing key interaction in Swing. Key Listeners require component focus in order to work. They were designed for the old AWT graphical library and not really suited to Swing.

Upvotes: 2

Vinnie
Vinnie

Reputation: 302

Your KeyEvent variable is "e" not "event". You have the wrong variable name.

Upvotes: 1

Suresh Atta
Suresh Atta

Reputation: 121998

  if (e.getKeyCode() == KeyEvent.VK_LEFT) {
        movePadLeft();
   }

You are recieving event as e.

That variable came from method argument

public void keyBoard(KeyEvent e){ <------

change it to event, that is more readable than simple e

public void keyBoard(KeyEvent event){
   if (event.getKeyCode() == KeyEvent.VK_LEFT) {
        movePadLeft();
   }

Upvotes: 2

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