java封裝練習

/*** 以面向對象的思想，編寫自定義類描述圖書信息。設定屬性包括：書名、作者、出版社名、價格* 方法包括：信息介紹** 要求：* 1、設置屬性的私有訪問權限，通過公有的get、set方法實現對屬性的訪問* 2、限定價格必須大于10，如果無效進行提示* 3、設計構造方法實現對屬性賦值* 4、信息介紹方法描述圖書所有信息* 5、編寫測試類，測試對圖書類的對象及相關方法（測試數據信息自定）*/ public class Book {private String bookName;private String author;private String publisher;private double price;public Book(){}public Book(String bookName,String author,String publisher,double price){this.bookName = bookName;this.author = author;this.publisher = publisher;this.price = price;}public void setBookName(String bookName){this.bookName = bookName;}public String getBookName(){return this.bookName;}public void setAuthor(String author){this.author = author;}public String getAuthor(){return author;}public void setPublisher(String publisher) {this.publisher = publisher;}public String getPublisher() {return publisher;}public void setPrice(double price){if (price<10){this.price = 10;System.out.println("價格必須大于10元，默認10元");}else {this.price = price;}}public double getPrice(){return this.price;}public void show(){System.out.println("bookName:"+bookName+"\t"+"author:"+author+"\t"+"publisher:"+publisher+"\t"+"price:"+price);}public static void main(String[] args) {Book book1 = new Book();book1.setBookName("西游記");book1.setAuthor("吳承恩");book1.setPublisher("清華大學出版社");book1.setPrice(6);book1.show();Book book2 = new Book("紅樓夢","曹雪芹","清華大學出版社",30);book2.show();}}

執行代碼如下：

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