Is there any keyword in Java which is similar to the 'AS' keyword of C# [duplicate]

Answer 1

no, you can check with instanceof and then cast if it matches

User user = null;
if(obj instanceof User) {
  user = (User) obj;
}

Answer 2

No keyword, but for completeness I'll give you the 1-liner equivalent:

User user = obj instanceof User ? (User) obj : null;

(You might not have to have the explicit cast, I'm not sure.)

Answer 3

You can create a helper method

public static T as(Object o, Class<T> tClass) {
     return tClass.isInstance(o) ? (T) o : null;
}

User user = as(obj, User.class);