Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.awt.BorderLayout;
import java.awt.Cursor;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JProgressBar;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.SwingWorker;

public class Main extends JPanel {
    JButton startButton;
    JTextArea taskOutput;

    public Main() {
        super(new BorderLayout());
        JProgressBar progressBar = new JProgressBar(0, 100);
        progressBar.setValue(0);
        progressBar.setStringPainted(true);

        taskOutput = new JTextArea(5, 20);
        taskOutput.setEditable(false);

        startButton = new JButton("Start");
        startButton.setActionCommand("start");
        startButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent ae) {
                startButton.setEnabled(false);
                setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));

                final Task task = new Task();
                task.addPropertyChangeListener(new PropertyChangeListener() {
                    @Override
                    public void propertyChange(PropertyChangeEvent pce) {
                        if ("progress".equals(pce.getPropertyName())) {
                            int progress = (Integer) pce.getNewValue();
                            progressBar.setValue(progress);
                            taskOutput.append(String.format("Completed %d%% of task.\n", task.getProgress()));
                        }
                    }
                });
                task.execute();
            }
        });

        JPanel panel = new JPanel();
        panel.add(startButton);
        panel.add(progressBar);

        add(panel, BorderLayout.PAGE_START);
        add(new JScrollPane(taskOutput), BorderLayout.CENTER);

    }

    public static void main(String[] args) {
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JPanel progressBarPanel = new Main();
        frame.add(progressBarPanel);

        frame.pack();
        frame.setVisible(true);
    }

    private class Task extends SwingWorker<Void, Void> {
        @Override
        public Void doInBackground() {
            int progress = 0;
            setProgress(0);
            while (progress < 100) {
                try {
                    Thread.sleep(1000);
                } catch (Exception ignore) {
                }
                progress += 1;
                setProgress(Math.min(progress, 100));
            }
            return null;
        }

        @Override
        public void done() {
            startButton.setEnabled(true);
            setCursor(null);
            taskOutput.append("Done!\n");
        }
    }
}