How to check if the key pressed was an arrow key in Java KeyListener

Question

Can you help me refactor this code   public void keyPressed KeyEvent e             if  e getKeyCode    39                          Right arrow key code            else if  e getKeyCode    37                          Left arrow key code            repaint         Please mention how to check for up down arrow keys as well Thanks

User · Answer

You should be using things like  KeyEvent VK UP instead of the actual code   How are you wanting to refactor it   What is the goal of the refactoring

User · Answer

public void keyPressed KeyEvent e        if  e getKeyCode      KeyEvent VK RIGHT                   Right arrow key code       else if  e getKeyCode      KeyEvent VK LEFT                   Left arrow key code       else if  e getKeyCode      KeyEvent VK UP                   Up arrow key code       else if  e getKeyCode      KeyEvent VK DOWN                   Down arrow key code            repaint        The KeyEvent codes are all a part of the API  http   docs oracle com javase 7 docs api java awt event KeyEvent html

User · Answer

If you mean that you wanna attach this to your panel  Window that you are working with    then you have to create an inner class that extend from IKeyListener interface and then add that method in to the class   Then  attach that class to you panel by  this addKeyListener new subclass

User · Answer

public void keyPressed KeyEvent e        int keyCode   e getKeyCode        switch  keyCode              case KeyEvent VK UP                 handle up              break          case KeyEvent VK DOWN                 handle down              break          case KeyEvent VK LEFT                 handle left             break          case KeyEvent VK RIGHT                  handle right             break

User · Answer

Just to complete the answer  using the KeyEvent is the way to go  but up arrow is 38 and down arrow is 40 so       else if  e getKeyCode    38                      Up arrow key code           else if  e getKeyCode    40                      down arrow key code

[java] How to check if the key pressed was an arrow key in Java KeyListener?

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