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comparison src/fschmidt/util/java/ArrayStack.java @ 68:00520880ad02

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add fschmidt source
author Franklin Schmidt <fschmidt@gmail.com>
date Sun, 05 Oct 2025 17:24:15 -0600
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67:9d0fefce6985 68:00520880ad02
1 package fschmidt.util.java;
2
3 import java.util.Collection;
4 import java.util.List;
5 import java.util.ArrayList;
6 import java.util.EmptyStackException;
7
8
9 public class ArrayStack<E> extends ArrayList<E> implements Stack<E> {
10
11 public ArrayStack() {}
12
13 public ArrayStack(Collection<E> c) {
14 super(c);
15 }
16
17 @Override public void push(E item) {
18 add(item);
19 }
20
21 @Override public E pop() throws EmptyStackException {
22 int len = size();
23 if (len == 0)
24 throw new EmptyStackException();
25 return remove(len - 1);
26 }
27
28 @Override public E peek() throws EmptyStackException {
29 int len = size();
30 if (len == 0)
31 throw new EmptyStackException();
32 return get(len - 1);
33 }
34
35 }