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刚帮你调测了一下，当你输入"n"的时候，已经跳出循环了，只不过你没有输出提示，以为没出来，
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又输入字符了所有报错了，应该是输入金额的，我帮你加了下输出你可以看下结果；
public static void main(String args[]){
System.out.println("********************");
System.out.println("");
System.out.println("请选择购买商品编号：");
System.out.println("1.T恤(￥245.0) 网球鞋(￥570.0) 网球拍(￥500.0)");
System.out.println("********************");
System.out.println("");
double s=0;
String d;
do{
System.out.println("请输入商品编号：");
Scanner input=new Scanner(System.in);
int a=input.nextInt();
if(a==1){
System.out.println("请输入购买数量：");
int b=input.nextInt();
double c=245*b;
System.out.println("T恤￥245.0 数量:"+b+" "+"合计:"+c);
s=s+c;
}
else if(a==2){
System.out.println("请输入购买数量：");
int b=input.nextInt();
double c=570*b;
System.out.println("网球鞋￥245.0 数量:"+b+" "+"合计:"+c);
s=s+c;
}
else if(a==3){
System.out.println("请输入购买数量：");
int b=input.nextInt();
double c=500*b;
System.out.println("网球拍￥245.0 数量:"+b+" "+"合计:"+c);
s=s+c;
}
else {System.out.println("无此商品");}
System.out.println("否继续(y/n)");
d=input.next();
}while(d.equals("y"));
System.out.println("===========付款===========");
System.out.println("=====输入金额=====");
Scanner input=new Scanner(System.in);
int x=input.nextInt();
double m=s*0.8;
System.out.println("折扣：0.8");
System.out.println("应付金额："+m);
System.out.println("实际金额："+x);
double p=x-m;
System.out.println("找钱："+p);
}
html
head
meta http-equiv="Content-Type" content="text/html; charset=utf-8"
title购物与结算/title
style type="text/css"
/style
link rel="stylesheet" href="
script src="
script src="
script src="
script src="
(beta4)/IE9.js"/script
script src="
script type="text/javascript"
function pay()
{
var link = document.getElementById("a1");
link.click();
var a = new Array();
a[0]="html教程";
a[1]=12;
a[2]=1;
a[3]=a[1]*a[2];
var a1 = new Array();
a1[0]="java详解";
a1[1]=25;
a1[2]=2;
a1[3]=a1[1]*a1[2];
var b = new Array();
b[0]=a;
b[1]=a1;
var amount =0;
for(var i=0;ib.length;i++)
{
var c = new Array();
c=b[i];
amount = amount+c[3];
var tr ="tr";
for(var j=0;jc.length;j++)
{
tr+="td"+c[j]+"/td";
}
tr+="/tr";
$("#list").append(tr);
$("#all").html("b总计：/bfont color=\"red\""+amount+"/font")
}
}
function goon()
{
var link = document.getElementById("a2");
link.click();
$("#news").html("支付成功！！");
}
/script
/head
body
input type="button" class="btn btn-danger" value="点击结算" onclick="pay()"
a href="#myModaltishi" role="button" class="btn" data-toggle="modal" id="a1" style="display: none"/a
div id="myModaltishi" class="modal hide fade" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true"
div class="modal-header"
button type="button" class="close" data-dismiss="modal" aria-hidden="true"×/button
h3 id="myModalLabel"购物车/h3
/div
div class="modal-body"
div
table id="list" style="width: 95%;" class="table"
th商品名称/th
th单价/th
th数量/th
th金额/th
/table
/div
div align="right" id="all"/div
/div
div class="modal-footer"
button class="btn" data-dismiss="modal" aria-hidden="true"继续挑选/button
button class="btn btn-primary" data-dismiss="modal" onclick="goon()"支付/button
/div
/div
a href="#myModaltishi1" role="button" class="btn" data-toggle="modal" id="a2" style="display: none"/a
div id="myModaltishi1" class="modal hide fade" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true"
div class="modal-header"
button type="button" class="close" data-dismiss="modal" aria-hidden="true"×/button
h3 id="myModalLabel"系统提示/h3
/div
div class="modal-body"
h3 id="news" align="center"/h3
/div
div class="modal-footer"
button class="btn btn-primary" data-dismiss="modal"知道了/button
/div
/div
/body
!-- 浏览器打开可查看效果，
另外由于页面使用了bootstrap框架建议使用渲染较高的浏览器，例如：火狐 --
/html
2、public class Test11 {
public static void main(String[] args) {
System.out.println("滞贸旅客的人数" + (1189 - 108*10) );
}
}
3、public class Test11 {
public static void main(String[] args) {
try {
Scanner scanner = new Scanner(System.in);
System.out.print("输入购买鸡蛋（斤）：");
int number = scanner.nextInt();
if(number10){
throw new RuntimeException("不允许购买这么多！");
}
else {
System.out.println("用户应支付金额"+number*3.98);
}
}
catch (Exception e){
System.out.println(e.getMessage());
}
}
}
你也不说计算公式，不知道怎么计算，我去网上找了一个月支付款的计算公式，不知道和你题目的要求是否一样，如果不一样你就改下公式就行。
java代码如下：
public class Loan {
public static void main(String[] args){
double rate ;//利率
int year ; //年数
double money ; //贷款总额
double monthpay ;//月付款
Scanner sc = new Scanner(System.in);
System.out.println("输入月利率：");
rate = sc.nextDouble();
System.out.println("输入年数：");
year = sc.nextInt();
System.out.println("输入贷款总额：");
money = sc.nextDouble();
//计算月付款
monthpay = (money * rate)/Math.abs(1 - (1 / (1 + rate ) * year * 12 ));
System.out.println("每月应该还贷款：" + monthpay);
}
}