Доработаны примеры по потокам (Thread)

mil-lion · mil-lion · commit 51b2d92461b5 · 2021-04-10T23:36:54.000+03:00
diff --git a/src/main/java/ru/lionsoft/javase/hello/thread/HelloSemaphore.java b/src/main/java/ru/lionsoft/javase/hello/thread/HelloSemaphore.java
@@ -100,11 +100,12 @@ public static void main(String[] args) throws InterruptedException {
         
         Semaphore sem = new Semaphore(1); // 1 разрешение
         CommonResource res = new CommonResource();
-        for (int i = 0; i < 5; i++) {
-            new Thread(new CountThread(res, sem), "Thread #" + i).start();
-        }
         
-        Thread.sleep(5000);
+        Thread[] threades = new Thread[5];
+        for (int i = 0; i < threades.length; i++) {
+            threades[i] = new Thread(new CountThread(res, sem), "Thread #" + i);
+        }
+        ThreadUtil.startAndJoinThreads(threades);
         
         /*
          * Семафоры отлично подходят для решения задач, где надо ограничивать 
diff --git a/src/main/java/ru/lionsoft/javase/hello/thread/MySingleton.java b/src/main/java/ru/lionsoft/javase/hello/thread/MySingleton.java
@@ -14,6 +14,10 @@
  */
 public class MySingleton {
     
+    static {
+        System.out.println("@@@@ MySingleton Class Loaded!!!");
+    }
+    
     private MySingleton() {
         System.out.println("@@@@ MySingleton Created!!!");
     }
diff --git a/src/main/java/ru/lionsoft/javase/hello/thread/MySingletonLazy.java b/src/main/java/ru/lionsoft/javase/hello/thread/MySingletonLazy.java
@@ -14,6 +14,10 @@
  */
 public class MySingletonLazy {
     
+    static {
+        System.out.println("@@@@ MySingletonLazy Class Loaded!!!");
+    }
+    
     private MySingletonLazy() {
         System.out.println("@@@@ MySingletonLazy Created!!!");
     }
@@ -32,6 +36,20 @@ private MySingletonLazy() {
         return instance;
     }
     
+    // Way 2
+    public static MySingletonLazy getInstance2() {
+        if (instance == null) {
+            newInstance();
+        }
+        return instance;
+    }
+    
+    private static synchronized void newInstance() {
+        if (instance == null) {
+            instance = new MySingletonLazy();
+        }
+    }
+    
     public static void setUp() {
         System.out.println("@@@@ MySingletonLazy.setUp()");
     }
