The public Book class : Access Control « Class Definition « Java Tutorial

1. Java Tutorial
2. Class Definition
3. Access Control

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.

1. A public class must be saved in a file that has the same name as the class, and the extension must be java.
2. A Java source file can only contain one public class.
3. A Java source file can contain other classes that are not public.