add more demo for creating new thred

src/createthread/CreateByFutureTask.java

@@ -0,0 +1,18 @@
+package createthread;
+
+import java.util.concurrent.FutureTask;
+
+public class CreateByFutureTask {
+    public static void main(String[] args)
+    {
+        FutureTask<String> futureTask = new FutureTask<>(() -> "Create by FutureTask");
+
+        new Thread(futureTask).start();
+
+        try {
+            System.out.println(futureTask.get());
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+}