用循环语句for购物清算例题

 import java.util.Scanner;
public class work6{
    public static void main(String[] args){
    System.out.println("********************************************");
    System.out.println("请选择购买的商品编号:");    
    System.out.println("1.T恤\t\t2.网球鞋\t3.网球拍");
    System.out.println("********************************************");    
    Scanner sc=new Scanner(System.in);
    String flag="x";
    int pId = 0;
    int pNum = 0;
    double tPrice = 245.0;
    double wqxPrice = 570.0;
    double wqpPrice = 320.0;
    double oneTotalPrice = 0;
    double TotalPrice = 0;
    while ("x".equals(flag)){
        System.out.println();
        System.out.print("请输入商品编号;");