第十五章上机练习4

//上机练习4
import java.util.Scanner;
public class ZXC {
String[] goods=new String[]{"电风扇","洗衣机","电视机","冰箱","空调机"};
double[] price=new double[]{124.23,4500,8800.9,5000,4456};
public boolean login(){
boolean flag=false;
Scanner input=new Scanner(System.in);
System.out.println("请输入用户名:");
String name=input.next();
System.out.println("请输入密码:");
String pwd=input.next();
if(name.equals("TOM")&&pwd.equals("12354")){
System.out.println("登陆成功!  ");
flag=true;
}else{
System.out.println("用户名或密码不正确,登陆失败!");
}
return flag;
}
public StringBuffer change(String string){
StringBuffer str=new StringBuffer(String.valueOf(string));
for(int i=str.indexOf(".")-3;i>0;i=i-3){
str.insert(i, ',');
}
return str;
}
public void shows(){
System.out.println("*****欢迎进入商品批发城*******");
System.out.println("\t编号\t商品\t价格\n");
for(int i=0;i<goods.length;i++){
System.out.println("\t"+(i+1));
System.out.println("\t"+goods[i]);
System.out.println("\t"+change(price[i]+"\n"));
}
System.out.println("*********************************");
}
public static void main(String[] args) {
Scanner input=new Scanner(System.in);
ZXC a=new ZXC();
int serial,num;
double totle=0;
if(a.login()){
a.shows();
System.out.println("请输入您批发的商品编号");
serial=input.nextInt();
System.out.println("请输入批发数量");
num=input.nextInt();
switch(serial){
case 1:
totle=124.23*num;
break;
case 2:
totle=4500*num;
break;
case 3:
totle=8800.9*num;
break;
case 4:
totle=5000*num;
break;
case 5:
totle=4456*num;
break;

}
System.out.println("您需要付款"+totle);
}
}
}