try_to_use_final_solve_DCL.java

class ObjectSingletonWrapper {
  final ObjectA object_a;
  static ObjectSingletonWrapper object_wrapper;
  
  ObjectSingletonWrapper() {
    object_a = new ObjectA();
  }
  
  static ObjectA get() {
    if (object_wrapper == null) {
      synchronized (ObjectSingletonWrapper.class) {
        if (object_wrapper == null) {
          object_warpper = new ObjectSingletonWrapper();
        }
      }
    }
    return object_wrapper.object_a;
  }
}