定义方法，实现更改某本书的价格，具体：如果价格」150,则更改为150，如果价格」100,更改为100，否则不变

定义方法，实现更改某本书的价格，具体：如果价格>150,则更改为150，如果价格>100,更改为100，否则不变

public class Test{ public static void main(String[] args){ Change changebooks = new Change(); changebooks.bookPrice = 130.5; System.out.println("bookPrice="+changebooks.bookPrice); changebooks.book(); } } class Change{ double bookPrice; public void book(){ if (bookPrice > 150){ bookPrice = 150; }else if (bookPrice > 100 && bookPrice < 150){ bookPrice = 100; } System.out.println("bookPrice="+bookPrice); } }

方法二：

public class Test{ public static void main(String[] args){ Change changebooks = new Change(); changebooks.book(130.5); } } class Change{ public void book(double bookPrice){ if (bookPrice > 150){ bookPrice = 150; }else if (bookPrice > 100 && bookPrice < 150){ bookPrice = 100; } System.out.println("bookPrice="+bookPrice); } }