new example fromCallable

src/main/java/rx/create/FromCallable.java

@@ -0,0 +1,19 @@
+package rx.create;
+
+import io.reactivex.Flowable;
+
+/*
+ * Flowable = Observable
+ * fromCallable is another way of deferring. It creates an observable from the result of call.
+ * Please note that the callable is not being called asynchronously. It's just deferred until subscription.
+ */
+public class FromCallable {
+    public static void main(String[] args) {
+        System.out.println("current thread: " + Thread.currentThread());
+
+        Flowable.fromCallable(() -> {
+            System.out.println(Thread.currentThread() + ": returning 'hello world'");
+            return "hello world";
+        }).subscribe();
+    }
+}