How do you create a new constructor in Java?

To create a new constructor in Java, you must define a method with the same name as the class it belongs to, and it cannot have a return type, not even void. This is what makes option B correct. In this example, the constructor is defined within the Actor class and takes two parameters, first and last, which allows you to instantiate an Actor object with different first and last names.

When defining a constructor, it's important that the method signature aligns exactly with the class's name and adheres to the appropriate access modifiers, such as public, to ensure that it can be accessed from outside the class if needed.

The other options fail to meet these criteria in different ways. For example, while option A appears to be a constructor as it uses the class name without parameters, it lacks context since it could lead to ambiguity without a defined class. Option C incorrectly uses the keyword new which is not valid in constructor definition, while option D lacks an access modifier, which is generally needed for constructors to be instantiated from outside their class.