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Lesson 8 - Birthday Reminder in Java Swing - Finishing the Application

In the previous lesson, Birthday Reminder in Java Swing - Completing the logic, we finished the logic layer of a friends' birthday reminder application. In today's lesson, we'll wire new methods to the form and complete the application.

Nearest Birthday

We'll add an auxiliary private method refreshNearest() to the main form class to refresh the label with the nearest birthday:

private void refreshNearest() {
    if (!personManager.getPersons().isEmpty()) {
        Person nearest = personManager.findNearest();
        int age = nearest.calculateAge();
        LocalDate today =;
        if (today.getDayOfMonth() != nearest.getBirthday().getDayOfMonth()
            || today.getMonth() != nearest.getBirthday().getMonth()
            || today.getYear() != nearest.getBirthday().getYear()) {
        nearestJLabel.setText(nearest.getName() + " (" + age + " years old) in " + nearest.getDaysRemaining() + " days");
    } else {
        nearestJLabel.setText("There are no persons in the list.");

If there are any persons in the person manager, we'll find


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Article description

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In this Java Swing tutorial, we'll wire the last methods from the logic layer to the form to finish a simple birthday reminder application.

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Article has been written for you by David Capka Hartinger
The author is a programmer, who likes web technologies and being the lead/chief article writer at He shares his knowledge with the community and is always looking to improve. He believes that anyone can do what they set their mind to.
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