簡單快遞系統 java實現

建立四個類Express,Locker, User, Administrator分別模擬快遞，快遞櫃，使用者和管理員。

import java.util.Random;
import java.util.Scanner;

/**
 * @author hxf
 * * @date 2020/12/12
 */
public class Test {
    static Scanner in = new Scanner(System.in);
    public static void main(String[] args) {
    	// 生成快遞櫃， 但在後續修改快遞位置時沒考慮越界問題
        Locker locker = new Locker(10, 10);
        // 建立管理員
        Administrator administrator = new Administrator(locker);
        //程式主邏輯
        outer: while (true){
            switch (login("請選擇身份:(-1退出 0管理員身份 1使用者身份)", 1)){
                case -1:
                    break outer;
                case 0:
                    switch (login("請選擇操作:(-1退出 0快遞錄入 1刪除快遞 2修改快遞 3檢視快遞)", 3)){
                        case -1:
                            break;
                        case 0:
                            in.nextLine();
                            System.out.println("請輸入公司名稱:");
                            System.out.println("取件碼:"+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("請選擇操作:(-1退出 0取快遞)", 0)){
                        case -1:
                            break;
                        case 0:
                            in.nextLine();
                            fetch(locker);
                            break;
                    }
                    break;
            }

        }

    }
	
	// 生成有效選擇，處理無效選擇產生的異常
    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("請輸入有效選擇！");
                in.nextLine();
                return login(string, n);
            }
            return select;
        }catch (Exception e){
            System.out.println("請輸入有效選擇！");
            in.nextLine();
            return login(string, n);
        }
    }
	
	// 使用者取快遞，確保輸入有效驗證碼
    public static void fetch(Locker locker){
        System.out.println("請輸入六位驗證碼:");
        String code = in.nextLine();
        User user = new User(code, locker);
        if (user.fetch()){
            System.out.println("取件成功");
        }else {
            System.out.println("驗證碼有誤，請重新輸入！");
            fetch(locker);
        }
    }
}

class Express {

    /**
     * @param code:     6位驗證碼，數字字串
     * @param company:  公司名稱
     * @param number:   14位快遞單號， 數字字串
     * @param position: 快遞存放位置
     * @author hxf
     * @describe: 快遞
     * @date 2020/12/11 1:17
     */

    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("快遞資訊簡介{");
        stringBuilder.append("快遞公司:");
        stringBuilder.append(company);
        stringBuilder.append(", 快遞單號:");
        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 {

    /**
     * @param   code:           儲存Express
     * @param   random:         隨機數生成器
     * @param   position:       存放臨時快遞位置
     * @param   LENGTH_OF_CODE: 驗證碼長度
     * @author hxf
     * @describe: 快遞櫃
     * @date 2020/12/11 1:25
     */

    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];
    }
	
	// 生成驗證碼
    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();
    }
    
	// 生成快遞單號
    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;
        }
    }
	
	// 檢查有無重複驗證碼，有則將position改成相應位置，無則position第一個元素為-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;
                }
            }
        }
    }
	
	// 檢查有無重複快遞單號
    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;
                }
            }
        }
    }

	// 將快遞存入快遞櫃
    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;
    }
	
	// 取出快遞
    public Express fetch(){
        Express express = code[position[0]][position[1]];
        code[position[0]][position[1]] = null;
        return express;
    }

    public int[] getPosition() {
        return position;
    }
	
	// 列印所有快遞資訊
    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("無快遞");
        }
    }
}


class User {

	/**
    *@Param: code:      驗證碼 
    *@Param: locker:    快遞櫃
    *@Author: hxf
    *@date: 2020/12/12
    */

    private final String code;
    private Locker locker;

    public User(String code, Locker locker) {
        this.code = code;
        this.locker = locker;
    }
	
	// 取快遞
    public boolean fetch(){
        locker.checkCode(code);
        if (locker.getPosition()[0] == -1){
            return false;
        }else {
            System.out.println(locker.fetch().toString());
            return true;
        }
    }

}

class Administrator {
	
	/**
    *@Param: locker:    快遞櫃
    *@Author: hxf
    *@date: 2020/12/12
    */
	
    Locker locker;
    Scanner in = new Scanner(System.in);

    public Administrator(Locker locker) {
        this.locker = locker;
    }
	
	// 錄入快遞
    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));
    }
	
	// 刪除快遞
    public void remove(){
        System.out.println("請輸入14位快遞單號:");
        String number = in.nextLine();
        locker.checkNumber(number);
        if (locker.getPosition()[0] != -1){
            System.out.println("單號為"+locker.fetch().getNumber()+"的快遞已經刪除");
        }else{
            System.out.println("快遞單號不存在，請重試");
            remove();
        }
    }
	
	// 修改快遞
    public void change(){
        System.out.println("請輸入14位快遞單號:");
        String number = in.nextLine();
        locker.checkNumber(number);
        if (locker.getPosition()[0] != -1){
            Express express = locker.fetch();
            System.out.println("請輸入新的快遞公司:");
            express.setCompany(in.nextLine());
            System.out.println("請輸入新的位置:(先行後列,空格隔開)");
            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("快遞單號不存在，請重試");
            change();
        }
    }
	
	// 顯示所有快遞資訊
    public void show(){
        locker.check();
    }
}