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. 216)を取り組んでみる。
コード
MainPage.xaml
<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:local="clr-namespace:App1"
x:Class="App1.MainPage">
<StackLayout>
<Label Text="働き蜂への仕事の割り当て"/>
<Picker x:Name="workerBeeJob"
Title="働き蜂の仕事">
<Picker.ItemsSource>
<x:Array Type="{x:Type x:String}">
<x:String>巣のメンテナンス</x:String>
<x:String>蜂蜜の収集</x:String>
<x:String>蜂蜜の製造</x:String>
<x:String>卵の世話</x:String>
<x:String>幼虫の世話</x:String>
<x:String>パトロール</x:String>
</x:Array>
</Picker.ItemsSource>
</Picker>
<Label Text="シフト"/>
<Editor x:Name="shifts"
Text="2"/>
<Button Text="この仕事を蜂に割り当てる"
Clicked="assignJob_Clicked"/>
<Button Text="次のシフトの実行"
Clicked="nextShift_Clicked"/>
<Editor x:Name="report" VerticalOptions="FillAndExpand"/>
</StackLayout>
</ContentPage>
MainPage.xaml.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Xamarin.Forms;
namespace App1
{
public partial class MainPage : ContentPage
{
private Queen queen;
public MainPage()
{
InitializeComponent();
Worker[] workers =
{
new Worker(175, new string[] {"蜂蜜の収集", "蜂蜜の製造" }),
new Worker(114, new string[]{"卵の世話", "幼虫の世話"}),
new Worker(149, new string[]{"巣のメンテナンス", "パトロール" }),
new Worker(155, new string[]
{"卵の世話", "楊柳の世話", "巣のメンテナンス", "パトロール"})
};
queen = new Queen(275, workers);
}
private void assignJob_Clicked(object sender, EventArgs e)
{
string job = workerBeeJob.SelectedItem.ToString();
int shift = Convert.ToInt32(shifts.Text);
if (queen.AssignWork(job, shift))
{
DisplayAlert(
"女王蜂が言った．．．",
"'" + job + "'は、あと" + shift + "シフトで終わる。",
"OK");
}
else
{
DisplayAlert("女王蜂が言った．．．",
"'" + job + "'の仕事をさせるための蜂がいない。",
"OK");
}
}
private void nextShift_Clicked(object sender, EventArgs e)
{
report.Text += queen.WorkTheNextShift();
}
}
public class Bee
{
private double weight;
public Bee(double weight)
{
this.weight = weight;
}
public virtual int ShiftsLeft { get => 0; }
public virtual double GetHoneyConsumption()
{
double consumption =
ShiftsLeft == 0 ? 7.5 : 9 + ShiftsLeft;
consumption *= weight > 150 ? 1.35 : 1;
return consumption;
}
}
public class Queen:Bee
{
private Worker[] workers;
private int shiftNumber;
public Queen(double weight, Worker[] workers):
base(weight)
{
this.workers = workers;
}
public override double GetHoneyConsumption()
{
double consumption = 0;
int shifts = 0;
foreach (Worker worker in workers)
{
if (worker.GetHoneyConsumption() > consumption)
{
consumption = worker.GetHoneyConsumption();
}
if (worker.ShiftsLeft > 0)
{
shifts++;
}
}
consumption += shifts <= 2 ? 20 : 30;
return consumption;
}
public bool AssignWork(string job, int shiftsToWork)
{
foreach (var worker in workers)
{
if (worker.DoThisJob(job, shiftsToWork))
{
return true;
}
}
return false;
}
public string WorkTheNextShift()
{
double consumption = 0;
foreach (Worker worker in workers)
{
consumption += worker.GetHoneyConsumption();
}
consumption += this.GetHoneyConsumption();
shiftNumber++;
string report = "シフト#" + shiftNumber + "のレポート\r\n";
for (int i = 0; i < workers.Length; i++)
{
Worker worker = workers[i];
if (worker.WorkOneShift())
{
report += "働き蜂#" + (i + 1) + "は作業を完了しました。\r\n";
}
if (string.IsNullOrEmpty(worker.CurrentJob))
{
report += "働き蜂#" + (i + 1) + "の作業はありません。\r\n";
}
else
{
if (worker.ShiftsLeft > 0)
{
report += "働き蜂#" + (i + 1) + "'" +
worker.CurrentJob +
"'の作業中で、あと" + worker.ShiftsLeft +
"つシフトがあります。\r\n";
}
else
{
report += "働き蜂#" + (i + 1) + "はこのシフトで'" +
worker.CurrentJob +
"'の作業を完了します。\r\n";
}
}
}
report += "消費したすべての蜂蜜の量: " + consumption + "単位\r\n";
return report;
}
}
public class Worker:Bee
{
private string currentJob;
private string[] jobsICanDo;
private int shiftsToWork;
private int shiftsWorked;
public Worker(double weight, string[] jobsICanDo):
base(weight)
{
this.jobsICanDo = jobsICanDo;
}
public string CurrentJob { get => currentJob; }
public override int ShiftsLeft { get => shiftsToWork - shiftsWorked; }
public bool DoThisJob(string job, int shiftsToWork)
{
if (string.IsNullOrEmpty(currentJob))
{
foreach (var item in jobsICanDo)
{
if (item == job)
{
this.shiftsToWork = shiftsToWork;
currentJob = job;
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;
}
}
}
App.xaml
<?xml version="1.0" encoding="utf-8" ?>
<Application xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="App1.App">
<Application.Resources>
</Application.Resources>
</Application>
App.xaml.cs
using System;
using Xamarin.Forms;
using Xamarin.Forms.Xaml;
[assembly: XamlCompilation(XamlCompilationOptions.Compile)]
namespace App1
{
public partial class App : Application
{
public App()
{
InitializeComponent();
// MainPage = new MainPage();
MainPage = new NavigationPage(
new MainPage() { Title = "ミツバチの巣管理システム" });
}
protected override void OnStart()
{
// Handle when your app starts
}
protected override void OnSleep()
{
// Handle when your app sleeps
}
protected override void OnResume()
{
// Handle when your app resumes
}
}
}
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