Java Random String generateRandomString(int length)

Description

Generate a random character string

License

Apache License

Parameter

Parameter	Description
length	the length of the string to be produced

Return

a String of the indicated length

Declaration

private static String generateRandomString(int length) 

Method Source Code

//package com.java2s;
/*//  www  .  j av a 2  s.  c o  m
 * Copyright 2015 Key Bridge LLC.
 *
 * 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.
 */

import java.util.*;

public class Main {
    /**
     * Generate a random character string
     * <p>
     * @param length the length of the string to be produced
     * @return a String of the indicated length
     */
    private static String generateRandomString(int length) {
        String alphabet = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
        int N = alphabet.length();
        Random r = new Random();
        StringBuilder sb = new StringBuilder(length);
        for (int i = 0; i < length; i++) {
            sb.append(alphabet.charAt(r.nextInt(N)));
        }
        return sb.toString();
    }
}

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