Adding this "Marquee code" to JLabel in my Jframe

Question

I've read this code on other post and it'sworking on individual Jframe with JPanel and JLabel. Now with help of this code i want to apply it to my JLabelof my JFrame. where my JFrame name is AddBatch, JPanel is pnl_addBatch and JLabel is lbl_addBatch [All set to their Location using that lazy drag and drop :)]

import java.awt.EventQueue;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.Timer;


public class MarqueeTest {

    private void display() {
        JFrame f = new JFrame("MarqueeTest");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        String s = "Tomorrow, and tomorrow, and tomorrow, "
        + "creeps in this petty pace from day to day, "
        + "to the last syllable of recorded time; ... "
        + "It is a tale told by an idiot, full of "
        + "sound and fury signifying nothing.";
        MarqueePanel mp = new MarqueePanel(s, 32);
        f.add(mp);
        f.pack();
        f.setLocationRelativeTo(null);
        f.setVisible(true);
        mp.start();
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                new MarqueeTest().display();
            }
        });
    }
}

class MarqueePanel extends JPanel implements ActionListener {

    private static final int RATE = 12;
    private final Timer timer = new Timer(1000 / RATE, this);
    private final JLabel label = new JLabel();
    private final String s;
    private final int n;
    private int index;

    public MarqueePanel(String s, int n) {
        if (s == null || n < 1) {
            throw new IllegalArgumentException("Null string or n < 1");
        }
        StringBuilder sb = new StringBuilder(n);
        for (int i = 0; i < n; i++) {
            sb.append(' ');
        }
        this.s = sb + s + sb;
        this.n = n;
        label.setFont(new Font("Serif", Font.ITALIC, 36));
        label.setText(sb.toString());
        this.add(label);
    }

    public void start() {
        timer.start();
    }

    public void stop() {
        timer.stop();
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        index++;
        if (index > s.length() - n) {
            index = 0;
        }
        label.setText(s.substring(index, index + n));
    }
}

Answer 1

The Marquee functionality does not have to reside in this MarqueePanel. This was probably just meant as an example. But you can change the class so that it accepts a JLabel in its constructor (and it does not extend JPanel anymore). This way, you may apply this Marquee-effect to any JLabel - also to already existing ones:

JLabel lbl_addBatch = createdSomewhere();

// Add marquee effect to the existing label:
Marquee marquee = new Marquee(lbl_addBatch, s, 32);
marquee.start();

Changed the code accordingly:

import java.awt.EventQueue;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.Timer;


public class MarqueeTest {

    private void display() {
        JFrame f = new JFrame("MarqueeTest");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        String s = "Tomorrow, and tomorrow, and tomorrow, "
        + "creeps in this petty pace from day to day, "
        + "to the last syllable of recorded time; ... "
        + "It is a tale told by an idiot, full of "
        + "sound and fury signifying nothing.";

        JLabel lbl_addBatch = new JLabel();
        JPanel pnl_addBatch = new JPanel();
        pnl_addBatch.add(lbl_addBatch);

        Marquee marquee = new Marquee(lbl_addBatch, s, 32);
        marquee.start();

        f.add(pnl_addBatch);
        f.pack();
        f.setLocationRelativeTo(null);
        f.setVisible(true);
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                new MarqueeTest().display();
            }
        });
    }
}

class Marquee implements ActionListener {

    private static final int RATE = 12;
    private final Timer timer = new Timer(1000 / RATE, this);
    private final JLabel label;
    private final String s;
    private final int n;
    private int index;

    public Marquee(JLabel label, String s, int n) {
        if (s == null || n < 1) {
            throw new IllegalArgumentException("Null string or n < 1");
        }
        StringBuilder sb = new StringBuilder(n);
        for (int i = 0; i < n; i++) {
            sb.append(' ');
        }
        this.label = label;
        this.s = sb + s + sb;
        this.n = n;
        label.setFont(new Font("Serif", Font.ITALIC, 36));
        label.setText(sb.toString());
    }

    public void start() {
        timer.start();
    }

    public void stop() {
        timer.stop();
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        index++;
        if (index > s.length() - n) {
            index = 0;
        }
        label.setText(s.substring(index, index + n));
    }
}