How to use

setInputListener

method

in

com.jme3.input.KeyInput

/**
 * Initializes the InputManager.
 *
 * <p>This should only be called internally in {@link Application}.
 *
 * @param mouse
 * @param keys
 * @param joystick
 * @param touch
 * @throws IllegalArgumentException If either mouseInput or keyInput are null.
 */
public InputManager(MouseInput mouse, KeyInput keys, JoyInput joystick, TouchInput touch) {
  if (keys == null || mouse == null) {
    throw new IllegalArgumentException("Mouse or keyboard cannot be null");
  }
  this.keys = keys;
  this.mouse = mouse;
  this.joystick = joystick;
  this.touch = touch;
  keys.setInputListener(this);
  mouse.setInputListener(this);
  if (joystick != null) {
    joystick.setInputListener(this);
    joysticks = joystick.loadJoysticks(this);
  }
  if (touch != null) {
    touch.setInputListener(this);
  }
  firstTime = keys.getInputTimeNanos();
}

/**
 * Initializes the InputManager.
 * 
 * <p>This should only be called internally in {@link Application}.
 *
 * @param mouseInput
 * @param keyInput
 * @param joyInput
 * @throws IllegalArgumentException If either mouseInput or keyInput are null.
 */
public InputManager(MouseInput mouse, KeyInput keys, JoyInput joystick, TouchInput touch) {
  if (keys == null || mouse == null) {
    throw new NullPointerException("Mouse or keyboard cannot be null");
  }
  this.keys = keys;
  this.mouse = mouse;
  this.joystick = joystick;
  this.touch = touch;
  keys.setInputListener(this);
  mouse.setInputListener(this);
  if (joystick != null) {
    joystick.setInputListener(this);
    joysticks = joystick.loadJoysticks(this);
  }
  if (touch != null) {
    touch.setInputListener(this);
  }
  firstTime = keys.getInputTimeNanos();
}

/**
 * Initializes the InputManager.
 *
 * <p>This should only be called internally in {@link Application}.
 *
 * @param mouse
 * @param keys
 * @param joystick
 * @param touch
 * @throws IllegalArgumentException If either mouseInput or keyInput are null.
 */
public InputManager(MouseInput mouse, KeyInput keys, JoyInput joystick, TouchInput touch) {
  if (keys == null || mouse == null) {
    throw new IllegalArgumentException("Mouse or keyboard cannot be null");
  }
  this.keys = keys;
  this.mouse = mouse;
  this.joystick = joystick;
  this.touch = touch;
  keys.setInputListener(this);
  mouse.setInputListener(this);
  if (joystick != null) {
    joystick.setInputListener(this);
    joysticks = joystick.loadJoysticks(this);
  }
  if (touch != null) {
    touch.setInputListener(this);
  }
  firstTime = keys.getInputTimeNanos();
}