用 LinkedList 实现一个 java.util.Stack 栈

用 LinkedList 实现一个 java.util.Stack 栈

import java.util.LinkedList;

public class Stack<E> {
    private LinkedList<E> storage = new LinkedList<>();

    public E push(E e) {
        storage.addFirst(e);
        return e;
    }

    public E peek() {
        return storage.getFirst();
    }

    public E pop() {
        return storage.removeFirst();
    }

    public boolean empty() {
        return storage.isEmpty();
    }

    public int search(Object o) {
        int i = storage.indexOf(o);

        if (i >= 0) {
            return i + 1;
        }
        return -1;
    }

    public int size() {
        return storage.size();
    }

    @Override
    public String toString() {
        return storage.toString();
    }
}