Java Random String getRandomString(int size)

Description

get Random String

License

Open Source License

Declaration

public static String getRandomString(int size) 

Method Source Code

//package com.java2s;

import java.util.Random;

public class Main {
    private static final Random RANDOM = new Random();
    private static final char[] CHARS = { '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', 'q', 'w', 'e', 'r', 't',
            'y', 'u', 'i', 'o', 'p', 'a', 's', 'd', 'f', 'g', 'h', 'j', 'k', 'l', 'z', 'x', 'c', 'v', 'b', 'n', 'm',
            'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P', 'A', 'S', 'D', 'F', 'G', 'H', 'J', 'K', 'L', 'Z', 'X',
            'C', 'V', 'B', 'N', 'M' };

    public static String getRandomString(int size) {
        StringBuilder s = new StringBuilder(size);
        int len = CHARS.length;
        for (int i = 0; i < size; i++) {
            int x = RANDOM.nextInt();
            s.append(CHARS[(x < 0 ? -x : x) % len]);
        }//from   ww w.  j  a v a  2  s .c o m
        return s.toString();
    }

    public static String toString(byte[] bytes) {
        if (bytes == null || bytes.length == 0) {
            return "";
        }
        StringBuffer buffer = new StringBuffer();
        for (byte byt : bytes) {
            buffer.append((char) byt);
        }
        return buffer.toString();
    }
}

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