Java Swing - 如何突出顯示JFormattedTextField以獲取更大的值

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import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Font;
import java.awt.font.TextAttribute;
import java.math.RoundingMode;
import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.util.Map;
import javax.swing.JFormattedTextField;
import javax.swing.JFormattedTextField.AbstractFormatter;
import javax.swing.JFormattedTextField.AbstractFormatterFactory;
import javax.swing.JFrame;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
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);
 
 
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