Switched comments to english

.idea/compiler.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="CompilerConfiguration">
-    <bytecodeTargetLevel target="11" />
+    <bytecodeTargetLevel target="15" />
   </component>
 </project>
\ No newline at end of file

.idea/misc.xml

@@ -4,7 +4,7 @@
   <component name="FrameworkDetectionExcludesConfiguration">
     <file type="web" url="file://$PROJECT_DIR$" />
   </component>
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_11" project-jdk-name="1.8" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_15" default="true" project-jdk-name="1.8" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/out" />
   </component>
 </project>
\ No newline at end of file

src/main/java/join/Main.java

@@ -9,19 +9,19 @@ public class Main {
     public static void main(String arg[]) throws Exception {
         Random r = new Random();
         ArrayList<Thread> threads = new ArrayList<Thread>();
-        //create some threads
+        //Create some threads
         for (int i=0; i<10; i++) {
             MyThread mt = new MyThread(r);
             threads.add(mt);
         }
         System.out.println("All threads have been created.");
-        //start all the threads
+        //Start all the threads
         for (Thread t: threads) {
             t.start();
         }
         System.out.println("All threads have been started.");
         System.out.println("Start waiting for all thread to finish...");
-        //wait all the thread to finish
+        //Wait all the thread to finish
         for (Thread t : threads) {
             t.join();
         }

src/main/java/semaphore/Main.java

@@ -8,13 +8,13 @@ public class Main {
         Random r = new Random();
         ArrayList<Thread> threads = new ArrayList<Thread>();
         Semaphore s = new Semaphore(4);
-        //create some threads
+        //Create some threads
         for (int i=0; i<10; i++) {
             MyThread mt = new MyThread(r, i, s);
             threads.add(mt);
         }
 
-        //start all the threads
+        //Start all the threads
         for (Thread t: threads) {
             t.start();
         }

src/main/java/semaphore/MyThread.java

@@ -18,7 +18,7 @@ public class MyThread extends Thread {
         System.out.println("Thread " + id + " wants to enter in the critical region");
         sem.enter();
         System.out.println("Thread " + id + " entered in the critical region!");
-        wasteSomeTime(); //it takes some times to compleate the work in the critical region
+        wasteSomeTime(); //It takes some times to compleate the work in the critical region
         System.out.println("Thread " + id + " is going to get out from the critical region");
         sem.exit();
     }//end run

src/main/java/semaphore/Semaphore.java

-package semaphore;//Classe che implementa tramite wait e notify un Semaforo.
-//Se non vi ricordate cosa sia un semaforo, google is your best friend.
+package semaphore;//Class that implements a semaphore, thanks to wait() and notify()
+//If you need to recap what a semaphore is, Google is your best friend.
 
 public class Semaphore {
-    private int maxNumber; //numero massimo di thread
-    private int threadsIn; //conteggio dei thread nell'area critica
+    private int maxNumber; //Maximum number of threads
+    private int threadsIn; //Number of threads in the critical region
 
     Semaphore(int max) {
         maxNumber = max;
@@ -12,7 +12,7 @@ public class Semaphore {
 
     public synchronized void enter() {
         System.out.println("" + threadsIn + " in the critical region...");
-        //quando abbiamo raggiunto il numero massimo di thread, chi vuole entrare aspetta
+        //When we reach the maximum number of threads, new threads need to wait
         while (threadsIn >= maxNumber) {
             try {this.wait();}
             catch(InterruptedException ie) {ie.printStackTrace();}
@@ -23,7 +23,7 @@ public class Semaphore {
 
     public synchronized void exit() {
         threadsIn--;
-        //quando un thread esce dall'area critica, sveglia qualcuno in attesa di entrare (se presente)
+        //Whena thread exits the critical region, it awakens another thread that is waiting (if there is one)
         this.notify();
     }
 }