Java Random Int randomString(int length)

Description

Generate a random string of characters - including numbers

License

Open Source License

Parameter

Parameter	Description
length	the length of the string to return

Return

a random string of characters

Declaration

private static String randomString(int length) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

public class Main {
    /**//from   w  ww  .ja  va 2  s .  c  o  m
     * Generate a random string of characters - including numbers
     *
     * @param length the length of the string to return
     * @return a random string of characters
     */
    private static String randomString(int length) {
        StringBuffer b = new StringBuffer(length);

        for (int i = 0; i < length; i++) {
            b.append(randomAlpha());
        }

        return b.toString();
    }

    /**
     * Generate a random character from the alphabet - either a-z or A-Z
     *
     * @return a random alphabetic character
     */
    private static char randomAlpha() {
        int i = (int) (Math.random() * 52);

        if (i > 25)
            return (char) (97 + i - 26);
        else
            return (char) (65 + i);
    }
}

Related

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2. randomSMSCode(int length)
3. randomStr(int length)
4. randomStr(int length, String charSet)
5. randomString(int count)
6. randomString(int length)
7. randomString(int length)
8. randomString(int length)
9. randomString(int min, int max)