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copied!<p><strong>You use the PlainDocument using for JTextField | JTextArea</strong> </p> <p><strong>Example</strong></p> <pre><code>import javax.swing.text.AttributeSet; import javax.swing.text.BadLocationException; import javax.swing.text.PlainDocument; @SuppressWarnings("serial") public class UserPlainDocument extends PlainDocument { private final int LIMIT_OF_CHARS; private final int DATA_TYPE; private final char[] SKIPPING_CHARS; public final static int ALL_DATA_TYPES = 1; public final static int DATA_TYPE_OF_INTEGER = 2; public final static int DATA_TYPE_OF_DOUBLE = 3; public UserPlainDocument(int limitOfChars, int dataType) { if(4 < dataType || 0 > dataType) throw new IllegalArgumentException( "This dataType value not available " + "please check the value."); this.LIMIT_OF_CHARS = limitOfChars; this.DATA_TYPE = dataType; this.SKIPPING_CHARS = null; } public UserPlainDocument(int limitOfChars, char[] skippingChars) { this.LIMIT_OF_CHARS = limitOfChars; this.SKIPPING_CHARS = skippingChars; this.DATA_TYPE = 0; } @Override public void insertString(int offs, String charAt, AttributeSet set) throws BadLocationException { if(offs + charAt.length() <= LIMIT_OF_CHARS) try { switch (DATA_TYPE) { case DATA_TYPE_OF_INTEGER: Integer.parseInt(charAt); super.insertString(offs, charAt, set); break; case DATA_TYPE_OF_DOUBLE: if(charAt.equals(".") && getText(0, offs). indexOf(".") == -1) { super.insertString(offs, charAt, set); break; } Double.parseDouble(charAt); super.insertString(offs, charAt, set); break; case ALL_DATA_TYPES: super.insertString(offs, charAt, set); break; default: for (int i = 0; i < SKIPPING_CHARS.length; i++) if(charAt.equals(String.valueOf(SKIPPING_CHARS[i]))) throw new BadLocationException("", offs); super.insertString(offs, charAt, set); break; } } catch (NumberFormatException e) { throw new BadLocationException(e.getMessage(), offs); } else throw new BadLocationException("", offs); } } </code></pre>

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