How do I check if the user is pressing a key

Question

In java I have a program that needs to check continuously if a user is pressing a key  So In psuedocode  somthing like  if  isPressing  w         do somthing     Thanks in advance

User · Answer

You have to implement KeyListener take a look here  http   docs oracle com javase 7 docs api java awt event KeyListener html  More details on how to use it  http   docs oracle com javase tutorial uiswing events keylistener html

User · Answer

In java you don t check if a key is pressed  instead you listen to KeyEvents   The right way to achieve your goal is to register a KeyEventDispatcher  and implement it to maintain the state of the desired key   import java awt KeyEventDispatcher  import java awt KeyboardFocusManager  import java awt event KeyEvent   public class IsKeyPressed       private static volatile boolean wPressed   false      public static boolean isWPressed             synchronized  IsKeyPressed class                return wPressed                       public static void main String   args            KeyboardFocusManager getCurrentKeyboardFocusManager   addKeyEventDispatcher new KeyEventDispatcher                   Override             public boolean dispatchKeyEvent KeyEvent ke                    synchronized  IsKeyPressed class                        switch  ke getID                          case KeyEvent KEY PRESSED                          if  ke getKeyCode      KeyEvent VK W                                wPressed   true                                                    break                       case KeyEvent KEY RELEASED                          if  ke getKeyCode      KeyEvent VK W                                wPressed   false                                                    break                                            return false                                                        Then you can always use   if  IsKeyPressed isWPressed             do your thing      You can  of course  use same method to implement isPressing   lt some key gt    with a map of keys and their state wrapped inside IsKeyPressed

User · Answer

Try this   import java awt event KeyAdapter  import java awt event KeyEvent  import javax swing JFrame  import javax swing JTextField   public class Main        public static void main String   argv  throws Exception        JTextField textField   new JTextField         textField addKeyListener new Keychecker          JFrame jframe   new JFrame         jframe add textField        jframe setSize 400  350        jframe setVisible true       class Keychecker extends KeyAdapter         Override     public void keyPressed KeyEvent event             char ch   event getKeyChar             System out println event getKeyChar

[java] How do I check if the user is pressing a key?

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