Question

As we know C# provides an AS keyword which automatically performs a check whether the Object is of a type and if it is, it then casts it to the needed type else gives a null.

public class User { }

Object obj = someObj;
User user = obj As User;

Here in the above example,
An Object obj can be of type User or some other type.
The user will either get an object of type User or a null.
This is because the As keyword of C# first performs a check and if possible then performs a casting of the object to the resulting type.

So is there any keyword in Java which is equivalent to the AS keyword of C#?

Answer 1

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);