[JAVA]模拟自动售货机

package class4_4;import java.util.ArrayList;import java.util.Scanner;import javax.swing.JOptionPane;public class Machine {private static ArrayList<Drinks> drinks = new ArrayList<Drinks>();private static double inputMoney;private static void adminUI() {// TODO Auto-generated method stubSystem.out.println("MENU:");System.out.println("【1】向售货机添加一种饮料");System.out.println("【2】查看售货机饮料的剩余信息");System.out.println("【3】修改某种饮料的产品信息");System.out.println("【0】退出管理员系统");}private static void userUI() {// TODO Auto-generated method stubSystem.out.println("MENU:");System.out.println("【1】查看所有饮料的信息");System.out.println("【2】购买某种饮料");System.out.println("【0】退出用户系统");}public static void main(String[] args) {drinks.clear();while (true) {System.out.println("请输入你的身份：");System.out.println("【1】管理员");System.out.println("【2】用户");System.out.println("【0】退出系统");Scanner in = new Scanner(System.in);int identity = Integer.parseInt(in.nextLine());while (identity != 1 && identity != 2 && identity != 0) {System.out.print("您的输入有误，请重新输入：");identity = Integer.parseInt(in.nextLine());}/** * 管理员系统 */if (identity == 1) {while (true) {adminUI();System.out.print("请输入对应选项的编号：");int command = Integer.parseInt(in.nextLine());while (command != 1 && command != 2 && command != 3 && command != 0) {System.out.print("您的输入有误，请重新输入：");command = Integer.parseInt(in.nextLine());}switch (command) {case 1: {Drinks d = new Drinks();d.setName(JOptionPane.showInputDialog("请输入需要添加的饮料的名称："));d.setPrice(Double.parseDouble(JOptionPane.showInputDialog("请输入添加该种饮料的价格：")));d.setNumber(Integer.parseInt(JOptionPane.showInputDialog("请输入添加该种饮料的数目：")));drinks.add(d);System.out.println("添加成功！");break;}case 2: {System.out.println("饮料名称" + '\t' + "单价" + '\t' + "剩余量");for (int i = 0; i < drinks.size(); i++) {Drinks d = drinks.get(i);System.out.println(d.getName() + '\t' + d.getPrice() + '\t' + d.getNumber());}System.out.println("****************结果如上****************");break;}case 3: {String name = JOptionPane.showInputDialog("请输入需要修改饮料的名称：");int index = -1;for (int i = 0; i < drinks.size(); i++) {if (drinks.get(i).getName().equals(name))index = i;}if (index == -1)System.out.println("售货机中不存在" + name);else {Drinks d = drinks.get(index);System.out.println("饮料名称" + '\t' + "单价" + '\t' + "剩余量");System.out.println(d.getName() + '\t' + d.getPrice() + '\t' + d.getNumber());d.setPrice(Double.parseDouble(JOptionPane.showInputDialog("请输入修改后该种饮料的价格：")));d.setNumber(Integer.parseInt(JOptionPane.showInputDialog("请输入修改后该种饮料的数目：")));drinks.remove(index);drinks.add(d);System.out.println("修改成功！");}break;}}if (command == 0)break;}}/** * 用户系统 */else if (identity == 2) {while(true){userUI();int command = Integer.parseInt(in.nextLine());while (command != 1 && command != 2 && command != 0) {System.out.print("您的输入有误，请重新输入：");command = Integer.parseInt(in.nextLine());}switch (command) {case 1:{System.out.println("饮料名称" + '\t' + "单价" + '\t' + "剩余量");for (int i = 0; i < drinks.size(); i++) {Drinks d = drinks.get(i);System.out.println(d.getName() + '\t' + d.getPrice() + '\t' + d.getNumber());}System.out.println("****************结果如上****************");break;}case 2:{String name = JOptionPane.showInputDialog("请输入需要购买饮料的名称：");int index = -1;for (int i = 0; i < drinks.size(); i++) {if (drinks.get(i).getName().equals(name))index = i;}if (index == -1)System.out.println("售货机中不存在" + name);else {Drinks d = drinks.get(index);System.out.println("饮料名称" + '\t' + "单价" + '\t' + "剩余量");System.out.println(d.getName() + '\t' + d.getPrice() + '\t' + d.getNumber());int num = Integer.parseInt(JOptionPane.showInputDialog("请输入需要购买的数量："));while(num>d.getNumber()){num = Integer.parseInt(JOptionPane.showInputDialog("余量不足！请重新输入需要购买的数量："));}d.setNumber(d.getNumber()-num);double money = Double.parseDouble(JOptionPane.showInputDialog("请投币："));double needPay=d.getPrice()*num;while(money<needPay){money = Double.parseDouble(JOptionPane.showInputDialog("金额不足！请重新投币："));}drinks.remove(index);drinks.add(d);System.out.println("购买成功！找零："+Math.round(money-needPay));}break;}}if(command==0)break;}}else break;}}}

package class4_4;public class Drinks {private String name;private double price;private int number;public String getName() {return name;}public void setName(String name) {this.name = name;}public double getPrice() {return price;}public void setPrice(double price) {this.price = price;}public int getNumber() {return number;}public void setNumber(int number) {this.number = number;}}

可能存在一些问题，不作细调。