Java Synchronization and Locks

Rajeev Kumar Singh · Rajeev Kumar Singh · commit 9005c1594bed · 2017-05-11T15:40:58.000+05:30
diff --git a/java-synchronization-and-locks/src/RaceConditionExample.java b/java-synchronization-and-locks/src/RaceConditionExample.java
@@ -0,0 +1,32 @@
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+
+/**
+ * Created by rajeevkumarsingh on 11/05/17.
+ */
+class Counter {
+    private int count = 0;
+
+    public void increment() {
+        count = count + 1;
+    }
+
+    public int getCount() {
+        return count;
+    }
+}
+
+public class RaceConditionExample {
+
+    public static void main(String[] args) {
+        ExecutorService executorService = Executors.newFixedThreadPool(10);
+
+        Counter counter = new Counter();
+
+        for(int i = 0; i < 1000; i++) {
+            executorService.submit(() -> counter.increment());
+        }
+
+        System.out.println("Final count is : " + counter.getCount());
+    }
+}
diff --git a/java-synchronization-and-locks/src/SynchronizedBlockExample.java b/java-synchronization-and-locks/src/SynchronizedBlockExample.java
@@ -0,0 +1,33 @@
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+
+/**
+ * Created by rajeevkumarsingh on 11/05/17.
+ */
+class FineGrainedSynchronizedCounter {
+    private int count = 0;
+
+    public void increment() {
+        // Synchronized Block
+        synchronized (this) {
+            count = count + 1;
+        }
+    }
+
+    public int getCount() {
+        return count;
+    }
+}
+
+public class SynchronizedBlockExample {
+    public static void main(String[] args) {
+        ExecutorService executorService = Executors.newFixedThreadPool(10);
+        FineGrainedSynchronizedCounter counter = new FineGrainedSynchronizedCounter();
+
+        for(int i = 0; i < 1000; i++) {
+            executorService.submit(() -> counter.increment());
+        }
+
+        System.out.println("Final count is " + counter.getCount());
+    }
+}
diff --git a/java-synchronization-and-locks/src/SynchronizedMethodExample.java b/java-synchronization-and-locks/src/SynchronizedMethodExample.java
@@ -0,0 +1,32 @@
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+
+/**
+ * Created by rajeevkumarsingh on 11/05/17.
+ */
+class SynchronizedCounter {
+    private int count = 0;
+
+    // Synchronized Method
+    public synchronized void increment() {
+        count = count + 1;
+    }
+
+    public int getCount() {
+        return count;
+    }
+}
+
+public class SynchronizedMethodExample {
+    public static void main(String[] args) {
+        ExecutorService executorService = Executors.newFixedThreadPool(10);
+
+        SynchronizedCounter synchronizedCounter = new SynchronizedCounter();
+
+        for(int i = 0; i < 1000; i++) {
+            executorService.submit(() -> synchronizedCounter.increment());
+        }
+
+        System.out.println("Final count is : " + synchronizedCounter.getCount());
+    }
+}
