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The public Book class

package yourpackagename; public class Book {     String isbn;     String title;     int width;     int height;     int numberOfPages; } The Book class is a member of the yourpackagename package and has five fields. Since Book is public, it can be instantiated from any other classes. A public class must be saved in a file that has the same name as the class, and the extension must be java. A Java source file can only contain one public class. A Java source file can contain other classes that are not public.