Interfaces, casting, and is: Making classes keep their promises - cast, is keyword
Head First C Sharp: A Learner’s Guide to Real-World Programming with C Sharp and .NET (Andrew Stellman(著)、Jennifer Greene(著)、O’Reilly Media)の Chapter 7(Interfaces, casting, and is: Making classes keep their promises)、p.381(Sharpen your pencil)の解答を求めてみる。
コード
Program.cs
using System;
namespace ConsoleApp3;
public interface IWorker
{
public string Job { get; }
void WorkTheNextShift();
}
入出力結果(Terminal, Zsh)
% dotnet run
/.../Program.cs(7,11): warning CS8601: Possible null reference assignment. [/Users/.../ConsoleApp3.csproj]
1. 0, 2, 5
0 True
1 False
2 True
3 False
4 False
5 True
6 False
7 False
2. 0, 1, 2, 3, 5
0 True
1 True
2 True
3 True
4 False
5 True
6 False
7 False
3. 0, 1, 2, 3, 5
0 True
1 True
2 True
3 True
4 False
5 True
6 False
7 False
%