Java Number Format formatNumber(final String number)

Description

format Number

License

Open Source License

Declaration

public static String formatNumber(final String number) 

Method Source Code

//package com.java2s;
/*/*from w w  w .j av  a 2s.c om*/
 * Copyright (c) 2005-2011 Grameen Foundation USA
 * All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * permissions and limitations under the License.
 *
 * See also http://www.apache.org/licenses/LICENSE-2.0.html for an
 * explanation of the license and how it is applied.
 */

public class Main {
    public static String formatNumber(final String number) {
        String num = "";
        String decimal = "";
        int index = number.lastIndexOf('.');

        if (index >= 0) {
            num = number.substring(0, index);
            decimal = number.substring(index);
        } else {
            num = number;
        }

        StringBuilder builder = new StringBuilder(num);

        if (num.length() > 3) {
            for (int i = num.length() - 3; i >= 0; i -= 3) {
                if (i > 0 && builder.charAt(i - 1) != ',') {
                    builder = builder.insert(i, ',');
                }
            }
        }

        String check = ".";

        for (int i = 0; i < decimal.length() - 1; i++) {
            check = check.concat("0");
        }

        if (!decimal.equalsIgnoreCase(check)) {
            builder = builder.append(decimal);
        }

        return builder.toString();
    }
}

Related

1. formatNumber(double number, int decimalPlaces)
2. formatNumber(Double val, int numDec, int width)
3. formatNumber(double value)
4. formatNumber(double value)
5. formatNumber(final long number)
6. formatNumber(final StringBuilder buf, final long number)
7. formatNumber(float num, int fragmentSize)
8. formatNumber(int number)
9. formatNumber(int number, int zeros)