Method Detail

• size

  int size()

  Returns the number of elements in the stack.

  Returns:

  number of elements in the stack

• isEmpty

  boolean isEmpty()

  Tests whether the stack is empty.

  Returns:

  true if the stack is empty, false otherwise

• push

  void push(E e)

  Inserts an element at the top of the stack.

  Parameters:

  e - the element to be inserted

• top

  E top()

  Returns, but does not remove, the element at the top of the stack.

  Returns:

  top element in the stack (or null if empty)

• pop

  E pop()

  Removes and returns the top element from the stack.

  Returns:

  element removed (or null if empty)