Java/com/study/demo3/PrintedBook.java

package com.study.demo3;
public class PrintedBook extends Book {
    private int stock;

   
    public PrintedBook() {
        super();
    }

   
    public PrintedBook(String isbn, String title, int stock) {
        super(isbn, title);
        this.stock = stock;
    }

   
    public int getStock() {
        return stock;
    }

    public void setStock(int stock) {
        this.stock = stock;
    }

    @Override
    public String toString() {
        return "PrintedBook [ISBN=" + isbn + ", Title=" + title + ", Stock=" + stock + ", Available=" + available + "]";
    }
}