求java大佬帮忙

import java.util.ArrayList;

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import java.util.Arrays;

import java.util.List;

public class Recipe {

private String name; //菜谱名称

private String style; //菜系 如：川菜、湘菜等

private int time; //烹饪时长 分钟

private String[] food; //食材

private String[] step; //操作步骤

public Recipe() {

}

public Recipe(String name, String style, int time, String[] food, String[] step) {

this.name = name;

this.style = style;

this.time = time;

this.food = food;

this.step = step;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public String getStyle() {

return style;

}

public void setStyle(String style) {

this.style = style;

}

public int getTime() {

return time;

}

public void setTime(int time) {

this.time = time;

}

public String[] getFood() {

return food;

}

public void setFood(String[] food) {

this.food = food;

}

public String[] getStep() {

return step;

}

public void setStep(String[] step) {

this.step = step;

}

@Override

public String toString() {

String foods="";

for (String f : food) {

foods+=f+" ";

}

String steps="";

for (int i = 0; i step.length; i++) {

steps += (i+1)+"."+step[i];

if(i!=step.length-1){

steps+=";";

}

}

return "菜谱名称：" + name +

"\n菜系：" + style +

"\n时长：" + time +

"\n所需食材：" + foods +

"\n操作步骤：" + steps;

}

public static void print(Recipe[] recipes){

for (Recipe recipe : recipes) {

System.out.println(recipe);

}

}

public static Recipe[] searchRecipesContainName(Recipe[] recipes, String name){

ListRecipe list=new ArrayListRecipe();

for (Recipe recipe : recipes) {

if(recipe.getName().contains(name)){

list.add(recipe);

}

}

return list.toArray(new Recipe[list.size()]);

}

public static Recipe[] searchRecipes(Recipe[] recipes, String style){

ListRecipe list=new ArrayListRecipe();

for (Recipe recipe : recipes) {

if(recipe.getStyle().equals(style)){

list.add(recipe);

}

}

return list.toArray(new Recipe[list.size()]);

}

public static Recipe[] searchRecipeLessThan(Recipe[] recipes, int time){

ListRecipe list=new ArrayListRecipe();

for (Recipe recipe : recipes) {

if(recipe.getTime()time){

list.add(recipe);

}

}

return list.toArray(new Recipe[list.size()]);

}

public static Recipe[] searchRecipeContainsFood(Recipe[] recipes, String food){

ListRecipe list=new ArrayListRecipe();

for (Recipe recipe : recipes) {

for (String s : recipe.getFood()) {

if(s.equals(food)){

list.add(recipe);

}

}

}

return list.toArray(new Recipe[list.size()]);

}

public static void main(String[] args) {

//存储5个菜谱的信息

Recipe[] recipes=new Recipe[5];

recipes[0]=new Recipe("酱牛肉","家常菜",120,

new String[]{

"牛腱子",

"黄豆酱油",

"黄酒",

"冰糖"

},

new String[]{

"准备好主要食材",

"加入食材慢炖两至三小时"

});

recipes[1]=new Recipe("红烧牛肉","家常菜",120,

new String[]{

"牛腩",

"牛筋",

"生抽",

"冰糖"

},new String[]{

"准备好主要食材",

"加入食材慢炖两至三小时"

});

recipes[2]=new Recipe("小鸡炖蘑菇","湘菜",100,

new String[]{

"小鸡",

"蘑菇"

},

new String[]{

"准备好主要食材",

"加入食材慢炖两至三小时"

});

recipes[3]=new Recipe("地三鲜","川菜",25,

new String[]{

"茄子",

"辣椒"

},

new String[]{

"准备好主要食材",

"加入食材慢炖"

});

recipes[4]=new Recipe("西红柿","湘菜",20,

new String[]{

"西红柿",

"味达美酱油"

},

new String[]{

"准备好主要食材",

"加入食材慢炖"

});

System.out.println("找到所有名称中包含牛肉的菜谱:");

Recipe[] result_1 = searchRecipesContainName(recipes, "牛肉");

print(result_1);

System.out.println("\n希望查找所有湘菜的菜谱:");

Recipe[] result_2=searchRecipes(recipes,"湘菜");

print(result_2);

System.out.println("\n查找烹饪时长小于30分钟的菜谱:");

Recipe[] result_3=searchRecipeLessThan(recipes,30);

print(result_3);

System.out.println("\n查找包含西红柿的菜谱:");

Recipe[] result_4=searchRecipeContainsFood(recipes,"西红柿");

print(result_4);

}

}

java新手求大神解答。主要求代码，有思路但是写不出啊。

import java.util.HashMap;

import java.util.Iterator;

import java.util.Map;

import java.util.Scanner;

enum Huo {

TX(1, "T恤", 245), WQX(2, "网球鞋", 570), WQP(3, "网球拍", 320);

private int id;

private String name;

private double price;

private Huo(int id, String name, double price) {

this.id = id;

this.name = name;

this.price = price;

}

public int getId() {

return id;

}

public String getName() {

return name;

}

public double getPrice() {

return price;

}

public static Huo getById(int id) {

for (Huo item : Huo.values()) {

if (item.id == id) {

return item;

}

}

return null;

}

}

public class Test {

private static MapInteger, Integer countMap = new HashMapInteger, Integer();

private static double sum = 0;

public static void main(String args[]) {

Scanner in = new Scanner(System.in);

while (true) {

System.out.println("**********************************************");

System.out.println("请选择购买的商品编号：");

for (Huo item : Huo.values()) {

System.out.print(item.getId() + ":" + item.getName() + "  ");

}

System.out.println();

System.out.println("**********************************************");

System.out.print("输入购买商品编号:");

int id = in.nextInt();

System.out.print("输入购买商品数量:");

int count = in.nextInt();

Integer tmp = countMap.get(id);

if (tmp == null) {

tmp = 0;

}

countMap.put(id, tmp + count);

show();

while (true) {

System.out.print("是否继续（y/n）：");

String jixu = in.next();

if ("Y".equalsIgnoreCase(jixu)) {

break;

} else if ("N".equalsIgnoreCase(jixu)) {

System.out.print("请支付:");

double zhifu = in.nextDouble();

System.out.println("应付金额：" + sum);

System.out.println("客户支付：" + zhifu);

System.out.println("找钱:" + (zhifu - sum));

System.exit(0);

} else {

System.out.print("输入错误");

}

}

}

}

private static void show() {

IteratorInteger it = countMap.keySet().iterator();

while (it.hasNext()) {

Integer key = it.next();

Integer count = countMap.get(key);

Huo huo = Huo.getById(key);

double heji = huo.getPrice() * count;

System.out.println(huo.getName() + "￥" + huo.getPrice() + "   数量:" + count + "    合计:" + heji);

sum += heji;

}

}

}

java：小明去超市买东西，所有买到的东西都放在了购物车之中，最后到收银台一起结账。你编出来了是吗求助

public class ShopGoodsDemo {

public static void main(String[] args) {

ShopCar s1=new ShopCar(5);

s1.add(new EatFood("面包",12.1));

s1.add(new EatFood("辣条",2.4));

s1.add(new EatFood("饼干",22.3));

s1.add(new WashGoods("洗发水",32.5));

s1.add(new WashGoods("卫生纸",22.8));

print(s1.search("饼干"));

System.out.println("=============");

print(s1.getGoods());

}

public static void print(Goods gs[]){

double sum=0;

for(int i=0;igs.length;i++){

if(gs[i]!=null){

//System.out.println(p[i]+",");

System.out.println(gs[i].getName()+","+gs[i].getPrice());

sum=sum+gs[i].getPrice();

}

}

System.out.println("总价格为："+sum);

}

}

public interface Goods {

public String getName();

public double getPrice();

}

public class EatFood implements Goods{

private String name;

private double price;

public EatFood() {

}

public EatFood(String name, double price) {

super();

this.name = name;

this.price = price;

}

@Override

public double getPrice() {

return this.price;

}

public void setPrice(double price) {

this.price = price;

}

public void setName(String name) {

this.name = name;

}

@Override

public String getName() {

return this.name;

}

}

public class WashGoods implements Goods{

private String name;

private double price;

public WashGoods() {

}

public WashGoods(String name, double price) {

super();

this.name = name;

this.price = price;

}

@Override

public double getPrice() {

return this.price;

}

public void setPrice(double price) {

this.price = price;

}

public void setName(String name) {

this.name = name;

}

@Override

public String getName() {

return this.name;

}

}

public class ShopCar {

private Goods goods[]=null;

private int foot;

//数组的大小由程序外部决定

public ShopCar(int len) {

if(len0){

goods=new Goods[len];

}else{

goods=new Goods[1];

}

}

//判断数组的内容是否已满，未满，则添加

public boolean add(Goods g){

if(this.footthis.goods.length){

this.goods[foot]=g;

foot++;

return true;

}else{

return false;

}

}

//关键字查找

public Goods[] search(String keyword){

Goods go[]=null;

int count=0;

for(int i=0;ithis.goods.length;i++){

if(goods[i]!=null){

if(this.goods[i].getName().indexOf(keyword)!=-1){

count++;

}

}

}

go=new Goods[count];

int f=0;

for(int i=0;ithis.goods.length;i++){

if(goods[i]!=null){

if(this.goods[i].getName().indexOf(keyword)!=-1){

go[f]=this.goods[i];

f++;

}

}

}

return go;

}

//得到全部信息

public Goods[] getGoods(){

return this.goods;

}

}

Java购物结算，卡在不懂do...while跳出循环和最后的总金额。求解决，谢谢

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，

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);

}