Update arborescence 2

src/progressbar/ProgressBar.java

@@ -0,0 +1,46 @@
+package progressbar;
+
+// Source : https://masterex.github.io/archive/2011/10/23/java-cli-progress-bar.html
+
+public class ProgressBar {
+    private StringBuilder progress;
+
+    /**
+     * initialize progress bar properties.
+     */
+    public ProgressBar() {
+        init();
+    }
+
+    /**
+     * called whenever the progress bar needs to be updated.
+     * that is whenever progress was made.
+     *
+     * @param done an int representing the work done so far
+     * @param total an int representing the total work
+     */
+    public void update(int done, int total) {
+        char[] workchars = {'|', '/', '-', '\\'};
+        String format = "\r%3d%% %s %c";
+
+        int percent = (++done * 100) / total;
+        int extrachars = (percent / 2) - this.progress.length();
+
+        while (extrachars-- > 0) {
+            progress.append('=');
+        }
+
+        System.out.printf(format, percent, progress,
+         workchars[done % workchars.length]);
+
+        if (done == total) {
+            System.out.flush();
+            System.out.println();
+            init();
+        }
+    }
+
+    private void init() {
+        this.progress = new StringBuilder(60);
+    }
+}