.gitignore

*.class

Makefile

default : test

build : Money.class

Money.class : Money.java
	javac -encoding utf8 -Xlint:unchecked Money.java 2>&1 | lv -Ou | cat

do : build
	java -Dfile.encoding=UTF8 Money 88888

test : build
	prove ./test.pl

clean :
	rm -rf *.class

Money.java

import java.util.Comparator;
import java.util.SortedMap;
import java.util.TreeMap;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Money {
    private static SortedMap<Integer, String> money_kinds =
        new TreeMap<Integer, String>(new Comparator<Integer>() {
                public int compare(Integer a, Integer b) {
                    return b.compareTo(a);
                }
                public boolean equals(Object obj) {
                    return this.equals(obj);
                }
            });

    public static void setUp() {
        String[] money_names = {
              "10000円札"
            , "5000円札"
            , "2000円札"
            , "1000円札"
            , "500円玉"
            , "100円玉"
            , "50円玉"
            , "10円玉"
            , "5円玉"
            , "1円玉"
        };

        Pattern pattern = Pattern.compile("(\\d+).*");
        for (int i = 0; i < money_names.length; i += 1) {
            Matcher matcher = pattern.matcher(money_names[i]);
            matcher.matches();
            money_kinds.put(new Integer(matcher.group(1)), money_names[i]);
        }
    }

    public static void main(String[] args) {
        setUp();

        int value = Integer.parseInt(args[0]);

        System.out.println(args[0] + "円の金種は以下の通りです。");

        for (Integer k : money_kinds.keySet()) {
            String v = money_kinds.get(k);
            System.out.println(v + ":" + value / k);
            value = value % k;
        }
    }
}

test.pl

#!/usr/bin/env perl

use strict;
use warnings;

use Test::More tests => 1;

is(`java -Dfile.encoding=UTF8 Money 88888`, <<EOL);
88888円の金種は以下の通りです。
10000円札:8
5000円札:1
2000円札:1
1000円札:1
500円玉:1
100円玉:3
50円玉:1
10円玉:3
5円玉:1
1円玉:3
EOL