BikeManage下单车列表删空后判断

ss：如果单车列表里面的单车删完了，值就为空，需要判断

  @Override
    public void putBike(BikeCompany[] bikeCompanies, Scanner scanner) {
        System.out.println("迷你共享单车管理系统>>>管理员操作>>>投放单车");
        //显示公司列表
        for (BikeCompany bikeCompany : bikeCompanies) {
            System.out.println(bikeCompany.getCompanyId() + "-->" + bikeCompany.getCompanyName());
        }
        //选择单车品牌
        System.out.println("请输入要操作的单车品牌：");
        int inputCompanyId = scanner.nextInt();
        //根据品牌id查找品牌信息
        BikeCompany bikeCompany = getBikeCompanyById(inputCompanyId, bikeCompanies);
        //先判断
        if (bikeCompany == null) {
            System.out.println("[投放失败，该单车品牌不存在！]");
            return;
        }
        //允许投放
        System.out.println("请输入要投放的单车数量：");
        int count = scanner.nextInt();
        //获取单车品牌下的单车列表
        Bike[] putBikes = bikeCompany.getBikes(); //001

       //如果单车列表里面的单车删完了，值就为空，需要判断
        //扩容之前的数组的长度
        int oldLength = (putBikes == null) ? 0 : putBikes.length;
        //扩容之前最后一个单车的编号
        int lastId = (putBikes == null) ? getStartId(bikeCompany.getCompanyName()) : putBikes[oldLength - 1].getBikeId();
        //扩容
        putBikes = (putBikes == null) ? new Bike[count] : Arrays.copyOf(putBikes, putBikes.length + count);  //002
        //循环来存入单车对象
        for (int i = oldLength; i < putBikes.length; i++) {
            lastId = ++lastId;
            putBikes[i] = new Bike(lastId, bikeCompany.getCompanyName() + lastId, BikeConstants.UN_LEND_STATE,
                    null, null);
        }
        //将扩容之后的数组反填充
        bikeCompany.setBikes(putBikes);
        //总数
        bikeCompany.setSum(putBikes.length);
        System.out.println("投放<" + count + ">辆<" + bikeCompany.getCompanyName() + ">车成功！");
    }

    /**
     * 根据品牌编号查找品牌信息
     *
     * @param id
     * @param bikeCompanies
     * @return
     */
    private BikeCompany getBikeCompanyById(int id, BikeCompany[] bikeCompanies) {
        for (BikeCompany bikeCompany : bikeCompanies) {
            if (id == bikeCompany.getCompanyId()) {
                return bikeCompany;
            }
        }
        return null;
    }

    /**
     * 根据公司名称获取起始ID
     *
     * @param name
     * @return
     */
    private int getStartId(String name) {
        switch (name) {
            case BikeConstants.OFO:
                return BikeConstants.OFO_START_ID;
            case BikeConstants.HALO:
                return BikeConstants.HALO_START_ID;
            case BikeConstants.MO_BAI:
                return BikeConstants.MO_BAI_START_ID;
        }
        return 0;
    }

package com.javasm.constants;

import javax.swing.plaf.synth.SynthTextAreaUI;

/**
 * @Author：liulei
 * @Version：1.0
 * @Date：2022/11/24-16:13
 * @Since：jdk1.8
 * @Description：
 */
public class BikeConstants {
    //公司名称
    public static final String OFO = "ofo小黄车";
    public static final String MO_BAI = "摩拜";
    public static final String HALO = "哈罗";

    //单车借出状态（0、未借出  1、已借出）
    public static final int LEND_STATE = 1;
    public static final int UN_LEND_STATE = 0;

    //单车的起始ID
    public static final int OFO_START_ID = 99;
    public static final int MO_BAI_START_ID = 199;
    public static final int HALO_START_ID = 299;
}