June 2022
Beginner to intermediate
672 pages
17h 23m
Japanese
Content preview from Head Firstデザインパターン 第2版 ―頭とからだで覚えるデザインパターンの基本
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you are here
395
10
章
State
パターン
State
インタフェースと
State
クラスを定義する
insertQuarter()
ejectQuarter()
turnCrank()
dispense()
<<interface>>
State
HasQuarterState
insertQuarter()
ejectQuarter()
turnCrank()
dispense()
NoQuarterState
insertQuarter()
ejectQuarter()
turnCrank()
dispense()
SoldOutState
insertQuarter()
ejectQuarter()
turnCrank()
dispense()
public class GumballMachine {
final static int SOLD_OUT = 0;
final static int NO_QUARTER = 1;
final static int HAS_QUARTER = 2;
final static int SOLD = 3;
int state = SOLD_OUT;
int count = 0;
そして、それぞれの状態を
クラスに直接対応させます。
すべての状態用のインタフェースです。メソッドはガムボールマシン
で起こり得るアクションと直接対応しています（これらのメソッド
は、前に書いたコードのメソッドと同じです）。
最初に、すべての状態クラスが実装する
State
インタフェースを作成しましょう。 ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.