StackOverflow2013

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18086784
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2013-08-06T17:34:26.597
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2013-08-06T17:34:26.597
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<p>A <code>JFormattedTextField</code> can be used for many things, it can be also used to filter dates or phone numbers. You will either need to set a <code>NumberFormater</code> to the <code>TextField</code> or you use the DocumentFilter (works with JTextField only too).</p> <p>Check this code snippet, that's how you allow only digits in JTextField, by using DocumentFilter, as the most effeciive way :</p> <pre><code>import java.awt.*; import javax.swing.*; import javax.swing.text.AbstractDocument; import javax.swing.text.AttributeSet; import javax.swing.text.BadLocationException; import javax.swing.text.DocumentFilter; import javax.swing.text.DocumentFilter.FilterBypass; public class InputInteger { private JTextField tField; private MyDocumentFilter documentFilter; private void displayGUI() { JFrame frame = new JFrame("Input Integer Example"); frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); JPanel contentPane = new JPanel(); contentPane.setBorder( BorderFactory.createEmptyBorder(5, 5, 5, 5)); tField = new JTextField(10); ((AbstractDocument)tField.getDocument()).setDocumentFilter( new MyDocumentFilter()); contentPane.add(tField); frame.setContentPane(contentPane); frame.pack(); frame.setLocationByPlatform(true); frame.setVisible(true); } public static void main(String[] args) { Runnable runnable = new Runnable() { @Override public void run() { new InputInteger().displayGUI(); } }; EventQueue.invokeLater(runnable); } } class MyDocumentFilter extends DocumentFilter { @Override public void insertString(DocumentFilter.FilterBypass fp , int offset, String string, AttributeSet aset) throws BadLocationException { int len = string.length(); boolean isValidInteger = true; for (int i = 0; i < len; i++) { if (!Character.isDigit(string.charAt(i))) { isValidInteger = false; break; } } if (isValidInteger) super.insertString(fp, offset, string, aset); else Toolkit.getDefaultToolkit().beep(); } @Override public void replace(DocumentFilter.FilterBypass fp, int offset , int length, String string, AttributeSet aset) throws BadLocationException { int len = string.length(); boolean isValidInteger = true; for (int i = 0; i < len; i++) { if (!Character.isDigit(string.charAt(i))) { isValidInteger = false; break; } } if (isValidInteger) super.replace(fp, offset, length, string, aset); else Toolkit.getDefaultToolkit().beep(); } } </code></pre>
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1. POJFormattedTextField for Double still takes characters
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1. PTAnswer
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1. USDennis Kriechel
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