* Returns the number of elements in the stack. The push method, and the return type for both pop and top. The formal type parameter is used as the parameter type for For ex-Īmple, a variable representing a stack of integers could be declared with type Ing the elements stored in the stack to belong to any object type. We rely on Java’s generics framework allow. In order to formalize our abstraction of a stack, we define what is known as itsĪpplication programming interface (API) in the form of a Java interface, whichĭescribes the names of the methods that the ADT supports and how they are to be isEmpty: Returns a boolean indicating whether the stack is empty.size: Returns the number of elements in the stack.top: Returns the top element of the stack, without removing it.Pop: Removes and returns the top element from the stack.Push: Adds element e to the top of the stack.Many implementation options (e.g Array or Linked List). Time, but may only access or remove the most recently inserted object that remains A user may insert objects into a stack at any
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