JCalendar custom IDateEvaluator demonstration

SpecialDateEvaluator.java

import com.toedter.calendar.IDateEvaluator;
import java.awt.Color;
import java.util.Date;
import java.util.List;

public class SpecialDateEvaluator implements IDateEvaluator {

    private final List<Date> specialDates;

    public SpecialDateEvaluator(List<Date> specialDates) {
        this.specialDates = specialDates;
    }

    @Override
    public boolean isSpecial(Date date) {
        for (Date d : specialDates) {
            if (d.equals(date)) {
                return true;
            }
        }

        return false;
    }

    @Override
    public Color getSpecialForegroundColor() {
        return Color.black;
    }

    @Override
    public Color getSpecialBackroundColor() {
        return Color.red;
    }

    @Override
    public String getSpecialTooltip() {
        return null;
    }

    @Override
    public boolean isInvalid(Date date) {
        return false;
    }

    @Override
    public Color getInvalidForegroundColor() {
        return null;
    }

    @Override
    public Color getInvalidBackroundColor() {
        return null;
    }

    @Override
    public String getInvalidTooltip() {
        return null;
    }
}

SpecialDateEvaluatorDemo.java

import com.toedter.calendar.JCalendar;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Calendar;
import java.util.Date;
import java.util.List;
import javax.swing.JFrame;

public class SpecialDateEvaluatorDemo {

    public static void main(String[] args) throws ParseException {
        List<String> mysqlDates = Arrays.asList("2019-02-14", "2019-03-06"); // Assume you've got this info somehow
        List<Date> specialDates = convertToDates(mysqlDates);

        JCalendar c = new JCalendar();
        c.getDayChooser().addDateEvaluator(new SpecialDateEvaluator(specialDates));
        c.setCalendar(Calendar.getInstance());

        JFrame f = new JFrame("Special dates");
        f.add(c);
        f.pack();
        f.setVisible(true);
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }

    public static List<Date> convertToDates(List<String> dateStrings) throws ParseException {
        List<Date> dates = new ArrayList<>();
        SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");

        for (String dateString : dateStrings) {
            dates.add(df.parse(dateString));
        }

        return dates;
    }
}