Book

public class Book {

    String title;
    String author;
    int pages;
    int currentPage;

    void printInfo() {
        System.out.println("Book title is " + this.title);
        System.out.println("The author is " + this.author);
        System.out.println("Number of pages is " + this.pages);
        System.out.println("The current page is " + this.currentPage);
    }

    void skipPages(int plusPages) throws Exception {
        if(this.currentPage + plusPages > this.pages) {
            throw new Exception();
        } else {
            this.currentPage += plusPages;
        }
    }

    void nextPage() throws Exception {
        if(this.currentPage + 1 > this.pages) {
            throw new Exception();
        } else {
            this.currentPage += 1;
        }
    }
}