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;
/**/*from   w  w w  . j  a  v a  2  s  .c  o m*/
 * <pre>
 *    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 3 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 * </pre>
 */

import java.util.Random;

public class Main {
    private final static char[] c = { '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) {
        Random random = new Random();
        StringBuffer sb = new StringBuffer(size);
        for (int i = 0; i < size; i++) {
            sb.append(c[Math.abs(random.nextInt()) % c.length]);
        }
        return sb.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();
    }

    public static String toString(Object[] objs) {
        if (objs == null || objs.length == 0)
            return "[]";
        StringBuffer buffer = new StringBuffer("[");
        for (int i = 0; i < objs.length; i++) {
            buffer.append(String.valueOf(objs[i]));
            if (i != objs.length - 1) {
                buffer.append(",");
            }
        }

        buffer.append("]");
        return buffer.toString();
    }
}

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