Java UUID Create generateRandomMap(int count)

Description

Generates random map.

License

Open Source License

Parameter

Parameter	Description
count	number of entries generated map will contain

Return

map of count entries, randomly filled with keys and values

Declaration

public static Map<String, String> generateRandomMap(int count) 

Method Source Code

//package com.java2s;
/*//from   w w  w.j  av  a  2s.com
 * Copyright (c) 2015 Symmetric Infinity LLC
 *
 * MIT License
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

import java.util.HashMap;

import java.util.Map;
import java.util.Random;
import java.util.UUID;

public class Main {
    private static final Random r = new Random();

    /**
     * Generates random map.
     *
     * @param count number of entries generated map will contain
     * @return map of {@code count} entries, randomly filled with keys and values
     */
    public static Map<String, String> generateRandomMap(int count) {

        Map<String, String> randomData = new HashMap<String, String>();

        for (int i = 0; i < count; i++) {
            String randomKey = randomAlphanumeric(generateRandomNumber(16, 32));
            String randomValue = randomAlphanumeric(generateRandomNumber(16, 32));
            randomData.put(randomKey, randomValue);
        }

        return randomData;
    }

    /**
     * Generates random alpha-numeric string
     *
     * @param length length of randomly generated alpha-numeric string
     * @return random alpha-numeric string of given length
     */
    public static String randomAlphanumeric(int length) {
        StringBuilder builder = new StringBuilder();

        while (builder.length() < length) {
            builder.append(UUID.randomUUID().toString());
        }

        return builder.substring(0, length);
    }

    /**
     * Generates random number in given range.
     *
     * @param from lower bound of generated number
     * @param to upper bound of generated number
     * @return random number from given range
     */
    public static int generateRandomNumber(int from, int to) {
        return r.nextInt(to - from + 1) + from;
    }
}

Related

1. generateGUID()
2. generateGUID()
3. generateId()
4. generateID()
5. generateId()
6. generateRandomName()
7. GenerateRandomSlug()
8. generateRandomString(int length)
9. generateRandomTableName()