KeyStroke/KeyPress in Java

Submitted by donbermoy on Wednesday, December 17, 2014 - 00:22.

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This tutorial will teach you how to create a program in java that has a KeyPress or KeyStroke. So, now let's start this tutorial! 1. Open JCreator or NetBeans and make a java program with a file name of keyStroke.java. 2. Import the following package library: 
  1. import java.awt.event.*; // used to access the ActionEvent clas
  2. import javax.swing.*; //used to access the AbstractAction,Action,ActionMap,InputMap,JButton,JComponent,JFrame, and KeyStroke
3. We will initialize variables in our Main, variable frame as JFrame, button as JButton, and ACTION_KEY as String. 
  1.     String ACTION_KEY = "theAction";
  2.     JFrame frame = new JFrame("KeyStroke Sample"); 
  3.     JButton button = new JButton("Press the SpaceBar");
4. Create an ActionEvent to your button and will print "The spacebar button is pressed!". Have this code below: 
  1.     Action actionListener = new AbstractAction() {
  2.       public void actionPerformed(ActionEvent actionEvent) {
  3.         JButton source = (JButton) actionEvent.getSource();
  4.         System.out.println("The spacebar button is pressed!");
  5.       }
  6.     };
5. To have a space keytroke used the KeyStroke class with the getKeyStroke class. 
  1. KeyStroke space = KeyStroke.getKeyStroke(' ');
To provide an action on the button when pressing the spacebar, have this code below: 
  1.     InputMap inputMap = button.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW);
  2.     inputMap.put(space, ACTION_KEY);
  3.     ActionMap actionMap = button.getActionMap();
  4.     actionMap.put(ACTION_KEY, actionListener);
  5.     button.setActionMap(actionMap);
6. Lastly, add the button, set the size, visibility, and the close operation of the frame. Have this code below: 
  1.     frame.getContentPane().add(button);
  2.     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  3.     frame.setSize(400, 200);
  4.     frame.setVisible(true);
Output: output Here's the full code of this tutorial: 
  1. import java.awt.event.*; // used to access the ActionEvent clas
  2. import javax.swing.*; //used to access the AbstractAction,Action,ActionMap,InputMap,JButton,JComponent,JFrame, and KeyStroke
  3.  
  4. public class keyStroke {
  5.   public static void main(String[] a) {
  6.  
  7.     String ACTION_KEY = "theAction";
  8.     JFrame frame = new JFrame("KeyStroke Sample"); 
  9.     JButton button = new JButton("Press the SpaceBar");
  10.  
  11.     Action actionListener = new AbstractAction() {
  12.       public void actionPerformed(ActionEvent actionEvent) {
  13.         JButton source = (JButton) actionEvent.getSource();
  14.         System.out.println("The spacebar button is pressed!");
  15.       }
  16.     };
  17.  
  18.     KeyStroke space = KeyStroke.getKeyStroke(' ');
  19.     InputMap inputMap = button.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW);
  20.     inputMap.put(space, ACTION_KEY);
  21.     ActionMap actionMap = button.getActionMap();
  22.     actionMap.put(ACTION_KEY, actionListener);
  23.     button.setActionMap(actionMap);
  24.     frame.getContentPane().add(button);
  25.     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  26.     frame.setSize(400, 200);
  27.     frame.setVisible(true);
  28.   }
  29. }
For more inquiries and need programmer for your thesis systems in any kind of programming languages, just contact my number below. Best Regards, Engr. Lyndon Bermoy IT Instructor/System Developer/Android Developer/Freelance Programmer Mobile: 09488225971 Landline: 826-9296 E-mail:[email protected] Add and Follow me on Facebook: https://www.facebook.com/donzzsky Visit and like my page on Facebook at: https://www.facebook.com/BermzISware

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