Enthuware

What is the correct declaration for an abstract method 'add' in a class that is accessible to any class, takes no arguments and returns nothing?

abstract null add();

A method that is not supposed to return anything must specify void as its return type. null is not a  type, though it is a valid return value for any type.

int m1{return null;}

Type mismatch: cannot convert from null to int

mutley wrote:your question: what is the correct declaration for an abstract method 'add' in a class that is accessible to any class, takes no arguments and returns nothing?

the first option "public void add();" (in my bank of question at least) ...I guess is correct in the methos would be declared in an Interface isn't it?

public Interface myinterface
{
public void add();
}
this method would be by default public and abstract ... so in this case your question would have 2 correct answers