Java/com/study/demo3/EBook.java

package com.study.demo3;
public class EBook extends Book {
    private double fileSize;

   
    public EBook() {
        super();
    }

   
   
    public EBook(String isbn, String title, double fileSize) {
        super(isbn, title);
        this.fileSize = fileSize;
    }

   
    public double getFileSize() {
        return fileSize;
    }

    public void setFileSize(double fileSize) {
        this.fileSize = fileSize;
    }

    @Override
    public String toString() {
        return "EBook [ISBN=" + isbn + ", Title=" + title + ", FileSize=" + fileSize + "MB, Available=" + available + "]";
    }
}