LinkedListStack.java

/**
 * LinkedListStack
 *
 * @author LiYang
 * @DATE 2020/1/8
 **/
public class LinkedListStack<E> implements Stack<E> {
    private LinkedList<E> list;

    public LinkedListStack(){
        list = new LinkedList<>();
    }

    @Override
    public int getSize() {
        return list.getSize();
    }

    @Override
    public boolean isEmpty() {
        return list.isEmpty();
    }

    @Override
    public void push(E e) {
        list.addFirst(e);
    }

    @Override
    public E pop() {
        return list.removeFirst();
    }

    @Override
    public E peek() {
        return list.get(0);
    }

    @Override
    public String toString() {
        StringBuilder res = new StringBuilder();
        res.append("Stack Top:");
        res.append(list);
        return res.toString();
    }

    public static void main(String[] args) {
        LinkedListStack<Integer> stack = new LinkedListStack<>();

        for (int i = 0; i < 5; i++) {
            stack.push(i);
            System.out.println(stack);
        }
        stack.pop();
        System.out.println(stack);
    }
}