StackOverflow2013

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17871476
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2013-07-26T01:35:16.093
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2013-07-26T01:35:16.093
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1)Use <a href="http://docs.oracle.com/javase/tutorial/uiswing/misc/keybinding.html" rel="nofollow">KeyBindings</a> KeyListener has 2 big issues,first you listen to all keys and second you have to have focus and be focusable. Instead KeyBinding you bind for a key and you don't have to be in focus. Simple Example: <pre><code>AbstractAction escapeAction = new AbstractAction() { @Override public void actionPerformed(ActionEvent e) { //code here example ((JComponent)e.getSource()).setVisible(Boolean.FALSE); }}; String key = "ESCAPE"; KeyStroke keyStroke = KeyStroke.getKeyStroke(key); component.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW).put(keyStroke, key); component.getActionMap().put(key, escapeAction); </code></pre> You can use these JComponent constants <pre><code>WHEN_ANCESTOR_OF_FOCUSED_COMPONENT WHEN_FOCUSED WHEN_IN_FOCUSED_WINDOW </code></pre> 2) Don't use concrete inheritance if it isn't necessary at all. 3) Don't implement ActionListener in top classes, see <a href="http://www.oodesign.com/single-responsibility-principle.html" rel="nofollow">Single Responsability Principle</a> Example Change this: <pre><code>public class Board extends JPanel implements ActionListener{ </code></pre> to: <pre><code> public class Board{ private JPanel panel; private class MyActionListener implements ActionListener{ //code here } } </code></pre> 4) Don't use inheritance if it's just the same for example in your <code>KeyAdapter</code> , you don't add nothing to it, just use <code>KeyAdapter</code> (Now you are gonna to use keybinding so this is useless but to know :) ). 5) Add @Override annotation when you do overriding , also you should override <code>paintComponent(..)</code> instead of <code>paint(..)</code> in swing.
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1. POJava: help using KeyAdapter
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1. USnachokk
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1. POJava: help using KeyAdapter
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