java如何实现简单快递系统

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具体内容如下

创建四个类Express,Locker, User, Administrator分别模拟快递，快递柜，用户和管理员。

import java.util.Random;import java.util.Scanner;public class Test {    static Scanner in = new Scanner(System.in);    public static void main(String[] args) {        // 生成快递柜， 但在后续修改快递位置时没考虑越界问题        Locker locker = new Locker(10, 10);        // 创建管理员        Administrator administrator = new Administrator(locker);        //程序主逻辑        outer: while (true){            switch (login("请选择身份:(-1退出 0管理员身份 1用户身份)", 1)){                case -1:                    break outer;                case 0:                    switch (login("请选择操作:(-1退出 0快递录入 1删除快递 2修改快递 3查看快递)", 3)){                        case -1:                            break;                        case 0:                            in.nextLine();                            System.out.println("请输入公司名称:");                            System.out.println("取件码:"+administrator.store(in.nextLine()));                            break;                        case 1:                            administrator.remove();                            break;                        case 2:                            administrator.change();                            break;                        case 3:                            administrator.show();                            break;                    }                    break;                case 1:                    switch (login("请选择操作:(-1退出 0取快递)", 0)){                        case -1:                            break;                        case 0:                            in.nextLine();                            fetch(locker);                            break;                    }                    break;            }        }    }        // 生成有效选择，处理无效选择产生的异常    public static int login(String string, int n){        try{            System.out.println(string);            int select = in.nextInt();            if (select > n || select < -1){                System.out.println("请输入有效选择！");                in.nextLine();                return login(string, n);            }            return select;        }catch (Exception e){            System.out.println("请输入有效选择！");            in.nextLine();            return login(string, n);        }    }        // 用户取快递，确保输入有效验证码    public static void fetch(Locker locker){        System.out.println("请输入六位验证码:");        String code = in.nextLine();        User user = new User(code, locker);        if (user.fetch()){            System.out.println("取件成功");        }else {            System.out.println("验证码有误，请重新输入！");            fetch(locker);        }    }}class Express {        private final String code;    private String company;    private final String number;    private int[] position;    public Express(String code, String company, String number, int[] position) {        this.code = code;        this.company = company;        this.number = number;        this.position = position;    }    public String getCode() {        return code;    }    public String getCompany() {        return company;    }    public String getNumber() {        return number;    }    public int[] getPosition() {        return position;    }    public void setCompany(String company) {        this.company = company;    }    public void setPosition(int row, int column) {        this.position[0] = row;        this.position[1] = column;    }    @Override    public String toString() {        StringBuilder stringBuilder = new StringBuilder();        stringBuilder.append("快递信息简介{");        stringBuilder.append("快递公司:");        stringBuilder.append(company);        stringBuilder.append(", 快递单号:");        stringBuilder.append(number);        stringBuilder.append(", 存放位置:");        stringBuilder.append("第");        stringBuilder.append(position[0]);        stringBuilder.append("排,第");        stringBuilder.append(position[1]);        stringBuilder.append("列");        return stringBuilder.toString();    }}class Locker {        Express[][] code;    Random random;    int[] position;    private final int LENGTH_OF_CODE = 6;    private final int LENGTH_OF_NUMBER = 14;    public Locker(int row, int column){        code = new Express[row][column];        random = new Random();        position = new int[2];    }        // 生成验证码    public String generateCode(){        StringBuilder stringBuilder = new StringBuilder();        for (int i = 0; i < LENGTH_OF_CODE; i++){            stringBuilder.append(random.nextInt(10));        }        String string = stringBuilder.toString();        checkCode(string);        return position[0] == -1 ? string : generateCode();    }        // 生成快递单号    public String generateNumber(){        StringBuilder stringBuilder = new StringBuilder();        for (int i = 0; i < LENGTH_OF_NUMBER; i++){            stringBuilder.append(random.nextInt(10));        }        String string = stringBuilder.toString();        checkNumber(string);        return position[0] == -1 ? string : generateNumber();    }        //生成存放位置    public int[] generatePosition(){        int row = random.nextInt(code.length);        int column = random.nextInt(code[0].length);        if (code[row][column] != null){            return generatePosition();        }else{            position[0] = row;            position[1] = column;            return position;        }    }        // 检查有无重复验证码，有则将position改成相应位置，无则position第一个元素为-1    public void checkCode(String string){        position[0] = -1;        outer: for (int i = 0; i < code.length; i++){            for (int j = 0; j < code[0].length; j++) {                if (code[i][j] != null && code[i][j].getCode().equals(string)) {                    position[0] = i;                    position[1] = j;                    break outer;                }            }        }    }        // 检查有无重复快递单号    public void checkNumber(String string){        position[0] = -1;        outer: for (int i = 0; i < code.length; i++){            for (int j = 0; j < code[0].length; j++) {                if (code[i][j] != null && code[i][j].getNumber().equals(string)) {                    position[0] = i;                    position[1] = j;                    break outer;                }            }        }    }    // 将快递存入快递柜    public String store(Express express){        code[position[0]][position[1]] = express;        return express.getCode();    }    public void store(Express express, int row, int column){        code[row][column] = express;    }        // 取出快递    public Express fetch(){        Express express = code[position[0]][position[1]];        code[position[0]][position[1]] = null;        return express;    }    public int[] getPosition() {        return position;    }        // 打印所有快递信息    public void check(){        int count = 0;        for (Express[] expresses: code){            for (Express express : expresses){                if (express != null){                    System.out.println(express.toString());                    count++;                }            }        }        if (count == 0){            System.out.println("无快递");        }    }}class User {        private final String code;    private Locker locker;    public User(String code, Locker locker) {        this.code = code;        this.locker = locker;    }        // 取快递    public boolean fetch(){        locker.checkCode(code);        if (locker.getPosition()[0] == -1){            return false;        }else {            System.out.println(locker.fetch().toString());            return true;        }    }}class Administrator {                Locker locker;    Scanner in = new Scanner(System.in);    public Administrator(Locker locker) {        this.locker = locker;    }        // 录入快递    public String store(String company){        String number = locker.generateNumber();        String code = locker.generateCode();        int[] position = locker.generatePosition();        return locker.store(new Express(code, company, number, position));    }        // 删除快递    public void remove(){        System.out.println("请输入14位快递单号:");        String number = in.nextLine();        locker.checkNumber(number);        if (locker.getPosition()[0] != -1){            System.out.println("单号为"+locker.fetch().getNumber()+"的快递已经删除");        }else{            System.out.println("快递单号不存在，请重试");            remove();        }    }        // 修改快递    public void change(){        System.out.println("请输入14位快递单号:");        String number = in.nextLine();        locker.checkNumber(number);        if (locker.getPosition()[0] != -1){            Express express = locker.fetch();            System.out.println("请输入新的快递公司:");            express.setCompany(in.nextLine());            System.out.println("请输入新的位置:(先行后列,空格隔开)");            int row = in.nextInt();            int column = in.nextInt();            express.setPosition(row, column);            locker.store(express, row, column);            System.out.println("修改成功！");        }else{            System.out.println("快递单号不存在，请重试");            change();        }    }        // 显示所有快递信息    public void show(){        locker.check();    }}

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