public class Buch {
    private String title;
    private String author;
    public String ISBN;
    private int count;

    Buch(String newTitle, String newAuthor, String newISBN, int newCount) {
        title = newTitle;
        author = newAuthor;
        ISBN = newISBN;
        count = newCount;
    }

    public boolean ausleihen() {
        if (count > 0) {
            count--;
            return true;
        } else {
            return false;
        }
    }

    public void zurueckgeben() {
        count++;
    }

    public void buchInfo() {
        System.out.printf("Titel: %s\n", title);
        System.out.printf("Autor: %s\n", author);
        System.out.printf("ISBN: %s\n", ISBN);
        System.out.printf("Verfügbar: %s\n", count);
    }
}