Java Random Int random(int length)

Description

random

License

Apache License

Declaration

public static String random(int length) 

Method Source Code

//package com.java2s;
/**/*from w  ww  .  j ava  2  s.  c om*/
 * Copyright 2011 CaneData.org
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

public class Main {
    final static char[] digits = { '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', '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' };

    public static String random(int length) {
        StringBuffer sb = new StringBuffer(length);

        //33 ~ 126
        int radix = 126;

        for (int i = 0; i < length; i++) {
            int c = new Double(Math.random() % radix * radix).intValue();
            if (c < 33)
                continue;
            sb.append((char) c);
        }

        return sb.toString();
    }

    public static String random(int length, char[] specimen) {
        StringBuffer sb = new StringBuffer(length);

        int radix = specimen.length - 1;

        for (int i = 0; i < length; i++) {
            int a = (int) Math.round(Math.random() % radix * radix);
            sb.append(specimen[a]);
        }

        return sb.toString();
    }

    public static String toString(long l, int radix) {
        if (radix < 2 || radix > 62)
            radix = 10;
        if (radix == 10)
            return Long.toString(l);

        char ac[] = new char[65];
        int j = 64;
        boolean flag = l < 0L;
        if (!flag)
            l = -l;
        for (; l <= (long) (-radix); l /= radix)
            ac[j--] = digits[(int) (-(l % (long) radix))];

        ac[j] = digits[(int) (-l)];
        if (flag)
            ac[--j] = '-';
        return new String(ac, j, 65 - j);
    }
}

Related

1. randIntArray(int length)
2. randIntv(double fr, double to)
3. randLocation(int min, int max)
4. Random(int a, boolean Zero)
5. random(int length)
6. random(int length, String data)
7. random(int limit)
8. random(int lo, int hi)
9. Random(int low, int high)