Sep 14, 2007 · The return type is not part of the signature. However, when you override a method, you need to keep the return type compatible. Prior to Java SE 5.0, the return types had to be identical. However, it is now legal for the subclass to change the return type of an overridden method to a subtype of the original type. Oct 18, 2019 · The number of arguments can be found out using a.length, the way we find the length of an array in Java. Note: A method can have variable length parameters with other parameters too, but one should ensure that there exists only one varargs parameter that should be written last in the parameter list of the method declaration. containsInAnyOrder(java.util.Collection<Matcher<? super T>> itemMatchers) Creates an order agnostic matcher for Iterables that matches when a single pass over the examined Iterable yields a series of items, each satisfying one matcher anywhere in the specified collection of matchers. So how can I pass the user variable from one class to another class without resetting either one of the two classes. Do I need to use extends or implements or something like that? Struts action classes do their work in the execute() method, and that method has a parameter of type HttpServletRequest.Therefore, essentially, what the virtual keyword does is to allow a member of a derived class with the same name as one in the base class to be appropriately called from a pointer, and more precisely when the type of the pointer is a pointer to the base class that is pointing to an object of the derived class, as in the above example. The printLabel function has a single parameter that requires that the object passed in has a property called label of type string. One of the most common uses of interfaces in languages like C# and Java, that of explicitly enforcing that a class meets a particular contract, is also possible in TypeScript.