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copied!<p><em>Update Apr 2016</em></p> <p>This answer was created some years ago and the original answer is largely obsolete now. </p> <p>Since Java 8u40, Java has a <a href="https://docs.oracle.com/javase/8/javafx/api/javafx/scene/control/TextFormatter.html" rel="noreferrer">TextFormatter</a> which is usually best for enforcing input of specific formats such as numerics on JavaFX TextFields:</p> <ul> <li><a href="https://stackoverflow.com/questions/31039449/java-8-u40-textformatter-javafx-to-restrict-user-input-only-for-decimal-number">Java 8 U40 TextFormatter (JavaFX) to restrict user input only for decimal number</a></li> <li><a href="https://stackoverflow.com/questions/35093145/string-with-numbers-and-letters-to-double-javafx/">String with numbers and letters to double javafx</a></li> </ul> <p>See also other answers to this question which specifically mention TextFormatter.</p> <hr> <p><em>Original Answer</em></p> <p>There are some examples of this in this <a href="https://gist.github.com/1962045" rel="noreferrer">gist</a>, I have duplicated one of the examples below:</p> <pre><code>// helper text field subclass which restricts text input to a given range of natural int numbers // and exposes the current numeric int value of the edit box as a value property. class IntField extends TextField { final private IntegerProperty value; final private int minValue; final private int maxValue; // expose an integer value property for the text field. public int getValue() { return value.getValue(); } public void setValue(int newValue) { value.setValue(newValue); } public IntegerProperty valueProperty() { return value; } IntField(int minValue, int maxValue, int initialValue) { if (minValue > maxValue) throw new IllegalArgumentException( "IntField min value " + minValue + " greater than max value " + maxValue ); if (maxValue < minValue) throw new IllegalArgumentException( "IntField max value " + minValue + " less than min value " + maxValue ); if (!((minValue <= initialValue) && (initialValue <= maxValue))) throw new IllegalArgumentException( "IntField initialValue " + initialValue + " not between " + minValue + " and " + maxValue ); // initialize the field values. this.minValue = minValue; this.maxValue = maxValue; value = new SimpleIntegerProperty(initialValue); setText(initialValue + ""); final IntField intField = this; // make sure the value property is clamped to the required range // and update the field's text to be in sync with the value. value.addListener(new ChangeListener<Number>() { @Override public void changed(ObservableValue<? extends Number> observableValue, Number oldValue, Number newValue) { if (newValue == null) { intField.setText(""); } else { if (newValue.intValue() < intField.minValue) { value.setValue(intField.minValue); return; } if (newValue.intValue() > intField.maxValue) { value.setValue(intField.maxValue); return; } if (newValue.intValue() == 0 && (textProperty().get() == null || "".equals(textProperty().get()))) { // no action required, text property is already blank, we don't need to set it to 0. } else { intField.setText(newValue.toString()); } } } }); // restrict key input to numerals. this.addEventFilter(KeyEvent.KEY_TYPED, new EventHandler<KeyEvent>() { @Override public void handle(KeyEvent keyEvent) { if (!"0123456789".contains(keyEvent.getCharacter())) { keyEvent.consume(); } } }); // ensure any entered values lie inside the required range. this.textProperty().addListener(new ChangeListener<String>() { @Override public void changed(ObservableValue<? extends String> observableValue, String oldValue, String newValue) { if (newValue == null || "".equals(newValue)) { value.setValue(0); return; } final int intValue = Integer.parseInt(newValue); if (intField.minValue > intValue || intValue > intField.maxValue) { textProperty().setValue(oldValue); } value.set(Integer.parseInt(textProperty().get())); } }); } } </code></pre>

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