聲明一個圖書類，其數據成員為書名、編號（利用靜態變量實現自動編號）、書價，并擁有靜態數據成員冊數，記錄圖書的總冊數，在構造方法中利用此靜態變量為對象的編號賦值，在主方法中定義多個對象，并求出總冊數。 ```java //圖書類 public class Book{ private String name; private long id; private double price; private static int count = 0; public Book(String name,double price) { this.id=count+1; this.name=name; this.price=price; count++; } //setter、getter略 public String getInfo() { return "編號:"+this.id+",書名："+this.name+",書價："+this.price; } public static int getId() { return count; } } //圖書類 public class Test { public static void main(String args[]) { Book b1 = new Book("java",56.0); Book b2 = new Book("python",45.0); System.out.println(b1.getInfo()); System.out.println(b2.getInfo()); System.out.println("圖書總冊數:"+Book.getId()); } } ```