ProgressCounter.java

import java.util.Scanner;

public class ProgressCounter {

	private int counter = 0;

	private void progressPercentage(int remain) {
		if (remain > counter) {
			throw new IllegalArgumentException();
		}
		int maxBarSize = 100;
		int remainPercent = (100 * remain) / counter;

		char defaultChar = '.';
		String icon = "#";
		String bar = new String(new char[maxBarSize]);
		bar = bar.replace('\0', defaultChar) + "]";
		StringBuilder barDone = new StringBuilder("[");
		for (int i = 0; i < remainPercent; i++) {
			barDone.append(icon);
		}
		String barRemain = bar.substring(remainPercent, bar.length());


		System.out.print("\r" + barDone + barRemain + " " + remainPercent + "%");
	}

	private void progressbar() {
		try {
			synchronized (this) {
				for (int i = 1; i <= counter; ++i) {
					wait();
					progressPercentage(i);
				}
			}
			System.out.println();
		}
		catch (InterruptedException e) {
			e.printStackTrace();
		}
	}

	private void main(int val) throws InterruptedException {
		counter = val;
		Thread t1 = new Thread(this::progressbar);

		t1.start();

		for (int i = 1; i <= counter; ++i) {
			Thread.sleep(1000);
			synchronized (this) {
				notify();
			}
		}

	}

	public static void main(String[] args) throws InterruptedException {
		Scanner reader = new Scanner(System.in);
		new ProgressCounter().main(reader.nextInt());
		reader.close();
	}
}