[Java]NumberFormatクラスを利用して金額文字列を数値へ変換する

/******************************************************************************
 * @(#) $Id$
 * Copyright (c) 2003 NI-Lab.
 * Author: NI-Lab.
 * Since: 2003/11/03
 *****************************************************************************/
package info.nilab.sample;

import java.text.NumberFormat;
import java.text.ParseException;
import java.util.Currency;

/**
 * <pre>
 * 実行結果
 * ---------------------------------------------------
 * Currency Symbol: ￥
 * 123 -> Unparseable number: "123"
 * 123456 -> Unparseable number: "123456"
 * \123 -> Unparseable number: "\123"
 * \123,456 -> Unparseable number: "\123,456"
 * ￥123 -> 123.0
 * ￥123,456 -> 123456.0
 * ￥１２３ -> 123.0
 * ￥１２３，４５６ -> 123.0
 * ￥１２３、４５６ -> 123.0
 * ￥１２３・４５６ -> 123.0
 * ￥１２３,４５６ -> 123456.0
 * ￥-123 -> Unparseable number: "￥-123"
 * ￥-123,456 -> Unparseable number: "￥-123,456"
 * -￥123 -> -123.0
 * -￥123,456 -> -123456.0
 * \123 -> Unparseable number: "\123"
 * \123,456 -> Unparseable number: "\123,456"
 * ---------------------------------------------------
 * </pre>
 * @author NI-Lab.
 */
public class NumberFormatSample {

	public static void main(String[] args) {

		String[] list =
			{
				"123",
				"123456",
				"\\123",
				"\\123,456",
				"￥123",
				"￥123,456",
				"￥１２３",
				"￥１２３，４５６",
				"￥１２３、４５６",
				"￥１２３・４５６",
				"￥１２３,４５６",
				"￥-123",
				"￥-123,456",
				"-￥123",
				"-￥123,456",
				"\u00a5123",
				"\u00a5123,456",
				};

		NumberFormat nf = NumberFormat.getCurrencyInstance();
		Currency c = nf.getCurrency();
		System.out.println("Currency Symbol: " + c.getSymbol());

		for (int i = 0; i < list.length; i++) {

			String source = list[i];
			String parsed;

			try {
				Number n = nf.parse(list[i]);
				parsed = Double.toString(n.doubleValue());
			} catch (ParseException e) {
				parsed = e.getMessage();
			}

			System.out.println(source + " -> " + parsed);

		}

	}

}

ついでに、数値から金額文字列への変換を試してみた。
日本では小数点以下の数値は金額として表示しない？

--- ソースコード ---
	private static void format() {

		double[] list = { 10.5, 105.0, 1050.0, };

		NumberFormat nf = NumberFormat.getCurrencyInstance();

		for (int i = 0; i < list.length; i++) {
			double source = list[i];
			String formatted = nf.format(source);
			System.out.println(Double.toString(source) + " -> " + formatted);
		}

	}

--- 実行結果 ---
10.5 -> ￥10
105.0 -> ￥105
1050.0 -> ￥1,050