Stack

class Stack
{
    private int maxSize;
    private char[] stackArray;
    private int top;

    public Stack(int s){
        maxSize = s;
        stackArray = new char[maxSize];
        top = -1;
    }

    public void push(char j){
        stackArray[++top] = j;
    }

    public char pop(){
        return stackArray[top--];
    }

    public char peek(){
        return stackArray[top];
    }


    public boolean isEmpty(){
        return (top == -1);
    }

    public int size(){
        return top+1;
    }


    public char peekN(int n){
        return stackArray[n];
    }
}