package shenhui; import java.util.Scanner; class book { // 定义一个book类 String name; double price; String author; double sellprice; // 以上为book类的属性 book(){ System.out.println("这是默认的构造方法"); } book(String name,double price,String author){ this.name =name; this.price =price; this.author =author; } //构造函数book与类名相同,构造函数没有返回值,因此没有返回值数据类型的设定 //构造函数重载,可以根据输入参数的不同调用不同的构造函数 void show() { System.out.println("书名:" + name); System.out.println("定价:" + price); System.out.println("作者:" + author); } void normalprice() { System.out.println(String.format("%.2f", (price * 0.9))); } // 不带返回值的方法 // String.format("%.2f", (price*0.9))保留2位输出结果 double vipsellprice(double discount) { return discount * price; } // 带返回值的方法 } class bookshop { public static void main(String[] args) { book books[] = new book[5]; // int a[]=new int[5];仿照之前实例化数组的形式,实例化1个名叫books的数组,数组中每个元素都是book类的,所以下面要每个元素实例化 for (int a = 0; a < books.length; a++) { books[a] = new book();// 实例化books数组中每个元素为book类型 //System.out.println(book[a]); 传址 } books[0].name = "JAVA学习记录"; books[0].price = 32.55; books[0].author = "张三"; books[1].name = "c#学习方法"; books[1].price = 42.81; books[1].author = "李四"; books[2] =new book("生活的哲学",54.12,"王五"); books[3] =new book("万物有灵且美",32.34,"吉米·哈利"); //给每个对象的属性赋值 System.out.println("本店所有的书如下:"); for (book a : books) { a.show(); System.out.println("——————————————————————"); } System.out.println("请输入顾客类型:(normal or vip)"); Scanner in = new Scanner(System.in); String Customer = in.next(); //in.next() 空格/enter键不作为输入内容 //in.nextLine() 读取一行,空格/enter键也作为输入内容 System.out.println("欢迎"+Customer+"顾客"); if (Customer.equals("normal")) { for (int a = 0; a < books.length; a++) { books[a].show(); System.out.print("售价(九折优惠):"); books[a].normalprice(); System.out.println("——————————————————————"); } } else if (Customer.equals("vip")) { for (int b = 0; b < books.length; b++) { books[b].show(); System.out.println("售价(八折优惠)" + String.format("%.2f", books[b].vipsellprice(0.8))); System.out.println("——————————————————————"); } } in.close(); System.out.println("结束"); } }
java类、对象、方法学习
猜你喜欢
转载自shenhuibad.iteye.com/blog/2228612
今日推荐
周排行