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Interface jdsl.simple.api.Stack

public interface Stack
Interface for a stack.

A stack is a collection of objects elements that are inserted and removed according to the last-in first-out principle.

See Also:
StackEmptyException, Queue, Deque

Method Index

o isEmpty()
Tests if the stack is empty
o pop()
Remove the top element.
o push(Object)
Insert an element at the top.
o size()
Return the number of elements.
o top()
Inspect the top element, without removing it or otherwise modifying the stack.

Methods

o size 
 public abstract int size()
Return the number of elements.

Returns:
number of elements in the stack.
o isEmpty 
 public abstract boolean isEmpty()
Tests if the stack is empty

Returns:
true if the stack is empty, false otherwise.
o top 
 public abstract Object top() throws StackEmptyException
Inspect the top element, without removing it or otherwise modifying the stack.

Returns:
top element in the stack.
Throws: StackEmptyException
If this stack is empty.
o push 
 public abstract void push(Object element)
Insert an element at the top.

Parameters:
element - new element to be inserted.
o pop 
 public abstract Object pop() throws StackEmptyException
Remove the top element.

Returns:
element removed.
Throws: StackEmptyException
if this stack is empty 
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