Generate random hex string of wanted size - Android java.util

Android examples for java.util:Random String

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Description

Generate random hex string of wanted size

Demo Code

/*//  w  w w  . jav a  2s  . c o m
 *
 * Copyright (C) 2010 Colibria AS
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
//package com.java2s;
import java.util.Random;

public class Main {
    private static final char[] hexDigits = { '0', '1', '2', '3', '4', '5',
            '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
    private static Random random = new Random();

    /**
     * Generate random hex string of wanted size
     *
     * @param size the size
     * @return hex string
     */
    public static String randomHexString(int size) {
        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < size; i++) {
            sb.append(hexDigits[random(hexDigits.length)]);
        }
        return sb.toString();
    }

    /**
     * Gets a random number from 0 (including) to "max" (excluding) argument, i.e.
     * returns a value less than "max".
     *
     * @param maxValue maxValue
     * @return result
     */
    public static int random(int maxValue) {
        return random.nextInt(maxValue);
    }
}

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