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public class StackTest1 
{
    public static void main(String[] args) 
    {
        Stack myStack = new Stack (1);
        myStack.push(new Book("Kindheitstraum", "Horst Meier"));
        System.out.println(myStack.array[0]);
    }
}

class Stack
{
    private int top = 0; 
    Book [] array;
    int groesseStack=0;
    
    public Stack (int groesseStack)
    {
        this.groesseStack = groesseStack; 
    }
        
    public Book push (Book element)
    {
        return array[top++] = element;
    }
}


class Book
{
    private String titel;
    private String author;
    
    public Book (String titel, String author)
    {
        this.titel = titel;
        this.author = author;
    }
}