Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import javax.swing.JFrame;
import javax.swing.JProgressBar;
import javax.swing.SwingWorker;

public class Main {
    public static void main(String[] args) {
        JProgressBar pb = new JProgressBar(0, 100);
        ReadFileWorker worker = new ReadFileWorker();
        worker.addPropertyChangeListener(new PropertyChangeListener() {
            @Override
            public void propertyChange(PropertyChangeEvent evt) {
                if ("progress".equalsIgnoreCase(evt.getPropertyName())) {
                    pb.setValue(worker.getProgress());
                }
            }
        });
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.add(pb);
        f.pack();
        f.setVisible(true);
        worker.execute();
    }
}

class ReadFileWorker extends SwingWorker<List<String>, String> {
    @Override
    protected List<String> doInBackground() throws Exception {
        List<String> lines = new ArrayList<>(25);
        File textFile = new File("c:/Java_Dev/run.bat");
        long byteLength = textFile.length();

        System.out.println("Reading " + byteLength + " bytes...");

        try (InputStream is = new FileInputStream(textFile)) {
            byte[] content = new byte[1024];
            int bytesRead = -1;
            long totalBytes = 0;
            while ((bytesRead = is.read(content)) != -1) {
                totalBytes += bytesRead;
                setProgress(Math.round(((float) totalBytes / (float) byteLength) * 100f));
                String text = new String(content);
                lines.add(text);
                publish(text);
                Thread.sleep(1000);
            }
            System.out.println("Read " + totalBytes + " bytes...");
            System.out.println("Read " + lines.size() + " lines...");
        }
        return lines;
    }

    @Override
    protected void done() {
        try {
            List<String> lines = get();
            System.out.println(lines);
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }
}