Java Random Number genRandomNumberString(int numberCount)

Description

gen Random Number String

License

Open Source License

Declaration

public static String genRandomNumberString(int numberCount) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.util.Random;

public class Main {
    private static final char[] DEFAULT_CHARS = new char[] { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a',
            'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
            'w', 'x', 'y', 'z', };
    private static final char[] NUMBER_CHARS = new char[] { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', };
    private static final char[] NONEZERO_NUMBER_CHARS = new char[] { '1', '2', '3', '4', '5', '6', '7', '8', '9', };

    public static String genRandomNumberString(int numberCount) {
        return genRandomString(1, NONEZERO_NUMBER_CHARS) + genRandomString(numberCount - 1, NUMBER_CHARS);
    }//  w w  w  . j  a v a 2s  .c  o  m

    public static String genRandomString(int count) {
        return genRandomString(count, DEFAULT_CHARS);
    }

    public static String genRandomString(int count, char[] elements) {
        StringBuffer sb = new StringBuffer();

        int len = elements.length - 1;
        for (int i = 0; i < count; i++) {
            sb.append(elements[new Random(System.nanoTime()).nextInt(len)]);
        }

        return sb.toString();
    }
}

Related

1. genRandomNum(int pwd_len)
2. genRandomNumber()
3. genRandomNumber(int begin, int end)
4. genRandomNumber(int digitNumber)
5. genRandomNumber(int minNumber, int maxNumber, int digits)
6. genRandomNumList(int num, int count)
7. getChance(Number number)
8. getDocumentNumber()
9. getFlightNumber()