java-ja 第1回チキチキ『( ゜ェ゜)・;'.、ゴフッ』 - Strategy

( ) ;. Strategy @daisuke_m 2011/04/25

• @daisuke_m• @j5ik2o•• Java• Jiemamy• Apache Mahout

Strategy•••• ( ) →

• …

http://ja.wikipedia.org/wiki/Strategy_

" "• java.io.File

File•… • … • • …• file1, file2, file10 …

Strategy• case1 : •• case2 : if elseif elseif… •

/* case1 */void sort(List<File> target) { // sort by name}/* case2 */void sort(List<File> target, String type) { if ("name".equasls(type)) { // sort by name } else if ("size".equals(type)) { // sort by size } else { // default ... }}

Strategy• case 3 : ( ) •• case 4 : •

•" "

Strategy• •• • • → • SQL → RDBMS•

public interface Strategy { String process(int i);}public class Client { Strategy strategy; public Client(Strategy strategy) { this.strategy = strategy; } public void run() { for (int i = 1; i <= 100; i++) { System.out.println(strategy.process(i); } }}

/* FizzBuzz */public class FizzBuzzStrategy implements Strategy { public String process(int i) { if (i % 3 == 0 && i % 5 == 0) return "FizzBuzz"; if (i % 3 == 0) return "Fizz"; if (i % 5 == 0) return "Buzz"; return String.valueOf(i); }}/* Nabeatsu */public class NabeatsuStrategy implements Strategy { public String process(int i) { if (i % 3 == 0 || String.valueOf(i).contains("3")) { return i + " ( ´Д` ) ";; } return String.valueOf(i); }}

Client c = new Client( ); c.run();new FizzBuzzStrategy() new NabeatsuStrategy() FizzBuzz Nabeatsu 1 1 2 2 Fizz 3 ( ´Д` ) 4 4 Buzz 5 Fizz 6 ( ´Д` ) 7 7 8 8 9 ( ´Д` ) Fizz Buzz 10 11 11 12 ( ´Д` ) Fizz 13 13 ( ´Д` )

java-ja 第1回チキチキ『( ゜ェ゜)・;'.、ゴフッ』 - Strategy

by Daisuke Miyamoto

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