Java Swing How to - Define a JFormattedTextField to apply the format restrictions as you type

Question

We would like to know how to define a JFormattedTextField to apply the format restrictions as you type.

Answer

import java.awt.BorderLayout;
import java.math.RoundingMode;
import java.text.DecimalFormat;
import java.text.NumberFormat;
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import javax.swing.JFormattedTextField;
import javax.swing.JFormattedTextField.AbstractFormatter;
import javax.swing.JFormattedTextField.AbstractFormatterFactory;
import javax.swing.JFrame;
import javax.swing.text.InternationalFormatter;

public class Main {
  public static void main(String args[]) {
    JFrame frame = new JFrame();
    final JFormattedTextField textField1 = new JFormattedTextField(new Float(
        10.01));
    textField1.setFormatterFactory(new AbstractFormatterFactory() {
      @Override
      public AbstractFormatter getFormatter(JFormattedTextField tf) {
        NumberFormat format = DecimalFormat.getInstance();
        format.setMinimumFractionDigits(2);
        format.setMaximumFractionDigits(2);
        format.setRoundingMode(RoundingMode.HALF_UP);
        InternationalFormatter formatter = new InternationalFormatter(format);
        formatter.setAllowsInvalid(false);
        formatter.setMinimum(0.0);
        formatter.setMaximum(1000.00);
        return formatter;
      }
    });
    NumberFormat numberFormat = NumberFormat.getNumberInstance();
    numberFormat.setMaximumFractionDigits(2);
    numberFormat.setMaximumFractionDigits(2);
    numberFormat.setRoundingMode(RoundingMode.HALF_UP);
    final JFormattedTextField textField2 = new JFormattedTextField(numberFormat);
    textField2.setValue(new Float(10.01));
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.add(textField1, BorderLayout.NORTH);
    frame.add(textField2, BorderLayout.SOUTH);
    frame.setVisible(true);
    frame.pack();
  }
}