How to Update a JLabel Every X Seconds with Data from an ArrayList in Java?

Update JLabel Every X Seconds from ArrayList in Java

In this article, we aim to address the challenge of dynamically updating a JLabel every X seconds based on words obtained from an ArrayList using a Swing Timer.

Problem

We have a Java program that reads words from a text file and displays them sequentially on the console with a 2-second delay between each word. The goal is to replicate this behavior in a Spring-based GUI with a JLabel that flashes the words with similar intervals.

Solution

1. GUI Setup: Construct and display the graphical user interface.
2. Swing Timer: Create a javax.swing.Timer that runs every 500 milliseconds.
3. Action Listener: Implement an ActionListener that iterates through the ArrayList and updates the JLabel's text.
4. Integration: Add the ActionListener to the Timer and start the Timer.

Here's how the solution can be implemented in Java:

// Assuming you have an array list of strings named "words"
final Timer timer = new Timer(500, null);
ActionListener listener = new ActionListsner() {
    private Iterator<String> it = words.iterator();
    @Override
    public void actionPerformed(ActionEvent e) {
        if (it.hasNext()) {
            label.setText(it.next());
        }
        else {
            timer.stop();
        }
    }
};
timer.addActionListener(listener);
timer.start();

By following these steps, you can create a dynamic JLabel that updates its text every X seconds based on the words from the ArrayList, allowing for a flashing word effect in your GUI.

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