public class Stack {
    private Node top;
    private final int maxSize;
    private int size;

    static class Node {
        Object data;
        Node next;
    }

    public Stack(int maxSize) {
        this.top = null;
        this.maxSize = maxSize;
        this.size = 0;
    }

    public void push(Object data) {
        if (size == maxSize) {
            throw new RuntimeException("Stack is full");
        }
        Node node = new Node();
        node.data = data;
        node.next = top;
        top = node;
        size++;
    }

    public Object pop() {
        if (size == 0) {
            throw new RuntimeException("Stack is empty");
        }
        Object data = top.data;
        top = top.next;
        size--;
        return data;
    }

    public Object peek() {
        if (size == 0) {
            throw new RuntimeException("Stack is empty");
        }
        return top.data;
    }

    public int size() {
        return size;
    }

    public boolean isEmpty() {
        return size == 0;
    }

    public boolean isFull() {
        return size == maxSize;
    }

    public void clear() {
        top = null;
        size = 0;
    }

    public void print() {
        Node node = top;
        while (node != null) {
            System.out.println(node.data);
            node = node.next;
        }
    }
}