Added some DP

Author: NadavMozeson

src/ConcurrencyPatterns/TS_Singleton/Singleton.java

@@ -0,0 +1,18 @@
+package ConcurrencyPatterns.TS_Singleton;
+
+public class Singleton {
+    private static volatile Singleton instance;
+
+    private Singleton(){}
+
+    public static Singleton getInstance(){
+        if(instance == null){
+            synchronized(Singleton.class){
+                if(instance == null){
+                    instance = new Singleton();
+                }
+            }
+        }
+        return instance;
+    }
+}

src/ConcurrencyPatterns/ThreadPool/Main.java

@@ -0,0 +1,32 @@
+package ConcurrencyPatterns.ThreadPool;
+
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.Timer;
+import java.util.TimerTask;
+
+public class Main {
+    public static void main(String[] args) {
+        ExecutorService executorService = Executors.newFixedThreadPool(3);
+        for (int i = 0; i < 10; i++) {
+            executorService.execute(new TestRunnable());
+        }
+        executorService.shutdown();
+    }
+}
+
+class TestRunnable implements Runnable {
+    public void run() {
+        synchronized (System.out){
+            System.out.println("Running");
+        }
+        try {
+            Thread.sleep(2000);
+            synchronized (System.out){
+                System.out.println("Finished Running");
+            }
+        } catch (InterruptedException e) {
+            throw new RuntimeException(e);
+        }
+    }
+}

src/ConcurrencyPatterns/Thread_Adapter/C.java

@@ -0,0 +1,7 @@
+package ConcurrencyPatterns.Thread_Adapter;
+
+public class C {
+    public void func(){
+        System.out.println("Hello!");
+    }
+}

src/ConcurrencyPatterns/Thread_Adapter/Main.java

@@ -0,0 +1,9 @@
+package ConcurrencyPatterns.Thread_Adapter;
+
+public class Main {
+    public static void main(String[] args){
+        RunnableC runnable = new RunnableC();
+        Thread thread = new Thread(runnable);
+        thread.start();
+    }
+}

src/ConcurrencyPatterns/Thread_Adapter/RunnableC.java

@@ -0,0 +1,8 @@
+package ConcurrencyPatterns.Thread_Adapter;
+
+public class RunnableC extends C implements Runnable{
+    @Override
+    public void run() {
+        func();
+    }
+}