KeyHandler.java

package main;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
public class KeyHandler implements  KeyListener{

    public boolean upPressed, downPressed, leftPressed, rightPressed;

    @Override
    public void keyTyped(KeyEvent e){
    }

    @Override
    public void keyPressed(KeyEvent e){
        int code = e.getKeyCode();  //get k of the number pressed
        if (code ==KeyEvent.VK_W){
            upPressed = true;
        }
        if (code ==KeyEvent.VK_S){
            downPressed = true;
        }
        if (code ==KeyEvent.VK_A){
            leftPressed = true;
        }
        if (code ==KeyEvent.VK_D){
            rightPressed = true;
        }
    }

    @Override
    public void keyReleased(KeyEvent e) {
        int code = e.getKeyCode();
        if (code ==KeyEvent.VK_W){
            upPressed = false;
        }
        if (code ==KeyEvent.VK_S){
            downPressed = false;
        }
        if (code ==KeyEvent.VK_A){
            leftPressed = false;
        }
        if (code ==KeyEvent.VK_D){
            rightPressed = false;
        }
    }

}