Updated to GitHub Actions comments.

Author: Francisco-G-P

Diff for: twin/README.md

@@ -90,14 +90,17 @@ public class BallThread extends Thread {
   public void run() {
     synchronized (this) {
       while (isRunning) {
-        while (isSuspended) {
+        while (isSuspended && isRunning) {
           try {
             wait();
           } catch (InterruptedException e) {
             Thread.currentThread().interrupt();
             return;
           }
         }
+
+        if (!isRunning) break;
+
         twin.draw();
         twin.move();
         try {

Diff for: twin/src/main/java/com/iluwatar/twin/BallThread.java

@@ -50,14 +50,18 @@ public class BallThread extends Thread {
   public void run() {
     synchronized (this) {
       while (isRunning) {
-        while (isSuspended) {
+        while (isSuspended && isRunning) {
           try {
             wait(); // Puts the thread in waiting state.
           } catch (InterruptedException e) {
             Thread.currentThread().interrupt(); // Restores the interruption.
             return;
           }
         }
+
+        if (!isRunning)
+          break; // Secures clean exit
+
         twin.draw();
         twin.move();
         try {