Java Random String getRandomString(int length)

Description

get the alphanumeric string with the specific length.

License

Open Source License

Parameter

Parameter	Description
length	the length which is 8 by default.

Declaration

public static String getRandomString(int length) 

Method Source Code

//package com.java2s;
import java.util.Random;

public class Main {
    static char[] m_alphanumeric = { '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 Random random = new Random();

    /**//from   w  w w  .j a  v  a2 s.  co  m
     * get the alphanumeric string with the specific length.
     * @param length the length which is 8 by default.
     */
    public static String getRandomString(int length) {
        if (length <= 0)
            length = 8;
        byte[] bytes = new byte[length];
        random.nextBytes(bytes);
        StringBuffer sb = new StringBuffer(length);
        for (int i = 0; i < length; i++) {
            sb.append(m_alphanumeric[Math.abs(bytes[i] % 36)]);
        }
        return sb.toString();
    }
}

Related

1. getRandomString(int len, boolean ascii_only)
2. getRandomString(int lenght)
3. getRandomString(int length)
4. getRandomString(int length)
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6. getRandomString(int length)
7. getRandomString(int length)
8. getRandomString(int length)
9. getRandomString(int length)