Java Random Int randomStr(int length, String charSet)

Description

Generates random alphanumeric String of the specified length using characters specified in charSet.

License

Apache License

Parameter

Parameter	Description
length	a parameter
charSet	character set

Declaration

public static String randomStr(int length, String charSet) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

public class Main {
    /**//from w w w.j  a  v  a  2s.  c  om
     * Generates random alphanumeric String of the specified length using characters specified in charSet.
     * 
     * @param length
     * @param charSet character set 
     */
    public static String randomStr(int length, String charSet) {
        char[] result = new char[length];
        fillWithRandomChars(result, charSet);
        return new String(result);
    }

    /**
     * Populates given char array with random string using characters from
     * specified character set. Can be used for memory conservation purposes.
     * 
     * @param str
     * @param charSet  
     */
    public static void fillWithRandomChars(char[] str, String charSet) {
        char[] ALPHA_NUM = charSet.toCharArray();
        for (int i = 0; i < str.length; i++) {
            str[i] = ALPHA_NUM[(int) (Math.random() * ALPHA_NUM.length)];
        }
    }
}

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