C# - 継承 - オブジェクトの系図(基本システム、カプセル化)

Head First C#
原著

開発環境

• OS: Windows 10 Pro
• IDE(統合開発環境): Visual Studio Community 2017

Head First C# ―頭とからだで覚えるC#の基本 (Andrew Stellman (著)、Jennifer Greene (著)、佐藤 嘉一 (監修, 監修)、木下 哲也 (翻訳)、オライリージャパン)の5章(継承 - オブジェクトの系図)、エクササイズ(p. 211)を取り組んでみる。

コード

Form1.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp16
{
    public partial class Form1 : Form
    {
        Queen queen;
        public Form1()
        {
            InitializeComponent();
            Worker[] workers = new Worker[] {
                new Worker(new string[] {"花蜜の収集", "蜂蜜の製造" }),
                new Worker(new string[] {"卵の世話", "幼虫の世話" }),
                new Worker(new string[] {"巣のメンテナンス", "パトロール" }),
                new Worker(
                    new string[] {
                        "花蜜の収集", "蜂蜜の製造", "卵の世話",
                        "幼虫の世話", "巣のメンテナンス", "パトロール"})
            };
            queen = new Queen(workers);
        }

        private void button1_Click(object sender, EventArgs e)
        {
            queen.assignWork(workerBeeJob.Text, (int)shifts.Value);
        }

        private void button2_Click(object sender, EventArgs e)
        {
            report.Text += queen.workTheNextShift();
        }
    }
}

Program.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp16
{
    static class Program
    {
        /// <summary>
        /// アプリケーションのメイン エントリ ポイントです。
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new Form1());
        }
    }

    class Queen
    {
        private Worker[] workers;
        private int shiftNumber = 0;

        public Queen(Worker[] workers)
        {
            this.workers = workers;
        }

        public bool assignWork(string s, int n)
        {
            foreach (Worker worker in workers)
            {
                if (worker.doThisJob(s, n))
                {
                    return true;
                }
            }
            return false;
        }
        public string workTheNextShift()
        {
            shiftNumber++;
            string s = "シフト#" + shiftNumber + "のレポート\r\n";
            for (int i = 0; i < workers.Length; i++)
            {
                Worker w = workers[i];
                s += "働き蜂#" + (i + 1);
                if (w.workOneShift())
                {
                    s += "は作業を完了しました。";
                }
                else if (String.IsNullOrEmpty(w.CurrentJob))
                {
                    s += "は作業はありません。";
                }
                else
                {
                    s += "'" + w.CurrentJob + "'の作業中で、あと" + 
                        w.ShiftsLeft + "つシフトがあります。";
                }
                s += "\r\n";
            }
            return s;
        }
    }

    class Worker
    {
        private string currentJob = "";
        private int shiftsLeft;
        private string[] jobsICanDo;
        private int shiftsToWork;
        private int shiftsWorked;

        public Worker(string[] jobsICanDo)
        {
            this.jobsICanDo = jobsICanDo;
        }
        public string CurrentJob
        {
            get { return currentJob; }
        }
        public int ShiftsLeft
        {
            get
            {
                shiftsLeft = shiftsToWork - shiftsWorked;
                return shiftsLeft;
            }
        }

        public bool doThisJob(string job, int n)
        {
            if (!String.IsNullOrEmpty(currentJob))
            {
                return false;
            }
            foreach (string jobICanDo in jobsICanDo)
            {
                if (jobICanDo == job)
                {
                    currentJob = job;
                    shiftsToWork = n;
                    shiftsWorked = 0;
                    return true;
                }
            }
            return false;
        }
        public bool workOneShift()
        {
            if (String.IsNullOrEmpty(currentJob))
            {
                return false;
            }
            shiftsWorked++;
            if (shiftsWorked > shiftsToWork)
            {
                shiftsWorked = 0;
                shiftsToWork = 0;
                currentJob = "";
                return true;
            }
            return false;
        }
    }
}