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Creating Classes

This section shows you the main components of a class by using a small example that implements a stack — a data structure whose items are added and removed in a last-in-first-out (LIFO) fashion. The following figure shows the Stack class and identifies the elements of a class.

The Stack Class

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Note: java.util.List and java.util.ArrayList are generic types and require a type argument when used. The type argument is given in angle brackets (<Object>). For more information on generic types, see Generics.

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A class declaration first names the class, then specifies its superclasses and any interfaces it implements, followed by the class body. The next section, Declaring Classes covers the elements of a class declaration.

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