[Chapter 5] 5.3 Stacks

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| Chapter 5 Collections |

## 5.3 Stacks

The `Stack` class is a subclass of `Vector` that implements a last-in-first-out (LIFO) object stack. The `Stack` class uses the following methods to provide stack behavior:

- The `push()` method pushes an object onto the top of the stack.

- The `pop()` method removes and returns the top element from the stack. If the stack is empty, `pop()` throws an `EmptyStackException`.

- The `peek()` method returns, but does not remove, the top element from the stack. If the stack is empty, `peek()` throws an `EmptyStackException`.

- The `empty()` method returns `true` if and only if the stack is empty.

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