[code]
import java.util.Scanner；

public class Chapter3shoppinggiesuan {

    /**
     * @param args
     */
    public static void main(String[] args) {
        System.out.println("请输入是否是会员:是（y）/否（其他字符）");
        Scanner sc = new Scanner (System.in);
        String JieGuo = sc.toString();
        Scanner se = new Scanner (System.in);
        double Money = se.nextDouble();
        if(JieGuo.equals ("y")){
            System.out.println("请输入购物金额:"+Money);
            if(Money>200){
                System.out.println("实际支付："+(Money*0.75));   
            }else if(Money<200){
                System.out.println("实际支付："+(Money*0.8));
               
        }else{
            if(Money>100){
                System.out.println("实际支付："+(Money*0.9));   
            }else if(Money<100){
                System.out.println("实际支付："+Money);   
            }
               
            }
            
        }
        // TODO Auto-generated method stub

    }

}
/code]

import java.util.Scanner;

public class Chapter3shoppinggiesuan {
      /**
     * @param args
     */
    public static void main(String[] args) {
        System.out.println("请输入是否是会员:是（y）/否（其他字符）");
        Scanner scan = new Scanner (System.in);
        String isVip = scan.nextLine();
        System.out.println("请输入购物金额:");
        double pay = scan.nextDouble();
        scan.close();
        System.out.println("购物金额:" + pay);
        System.out.print("实际支付：");
        if("y".equals(isVip)){
            if(pay>200){
                System.out.printf("%.2f", pay*0.75);    
            }else if(pay<200){
                System.out.printf("%.2f", pay*0.8);
            }
        }else{
            if(pay>100){
                System.out.printf("%.2f", pay*0.9);    
            }else if(pay<100){
                System.out.printf("%.2f", pay);    
            }
        }
    }
}