Add application file for BAEL-4038 (#12851)

core-java-modules/core-java-concurrency-advanced-4/src/main/java/com/baeldung/threadparking/Application.java

@@ -0,0 +1,25 @@
+package com.baeldung.threadparking;
+
+import java.util.concurrent.locks.LockSupport;
+
+public class Application {
+
+    public static void main(String[] args) throws InterruptedException {
+        final Object syncObj = new Object();
+        Thread t = new Thread(() -> {
+            int acc = 0;
+            for (int i = 1; i <= 100; i++) {
+                acc += i;
+            }
+            System.out.println("Work finished");
+            LockSupport.park(syncObj);
+            System.out.println(acc);
+        });
+        t.setName("PARK-THREAD");
+        t.start();
+
+//        Thread.sleep(1000);
+        LockSupport.unpark(t);
+    }
+
+}