声明一个图书类，其成员包括书名、编号（利用静态变量实现自动编号）、书价

class Book {
private String name;
private int Nub = 000;
private float price;
private static int num = 0;
private static int sum = 0;
public Book(String name, float price, int num) {
  = + num;
  = sum;
  = name;
  = price;
  = num;
}
public void print() {
 ("书名: " + name + "\t" + "编号： "
+ Nub + "\t" + "价格： " + price + "\t"
+ "册数： " + num);
 ("\n" + "总册书为:" + sum);
}

}
 


public class Test {
 public static void main(String[] args) {
  Book book1 = new Book("Java开发实战经典", 100.8f, 10);
  ();
  Book book2 = new Book("Java大学实用教程", 60.5f, 4);
  ();
  Book book3 = new Book("名侦探柯南", 78.0f, 6);
  ();
  Book book4 = new Book("JavaEE基础实用教程", 36.7f, 10);
  ();
 }
}