rmake.java

// -*- coding: utf-8 -*-
/*
    rmake
    ~~~~~
    
    A random string generator, with 62 distinct characters 
    and upto 62^N possible values. If 10^6 values 
    are already generated, there's a 10^6/62^N 
    chance of collision.
    
    :copyright: 2019 Pancubs.org
    :license: MIT
*/

import java.util.Random;

public class rmake {
    
    public static String make(Integer N) {
        /*Returns a random string of length N. Possible characters include
        lowercase letters, uppercase letters, and decimal numbers.
        
            String myid = rmake.make();
        
        .. versionadded: 0.1
           The first version. Uses java.util.Random.
        
        :param N: the size of the random string.
        */
        
        //: The object that defines what possible characters 
        //: are generated.
        char[] _chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789".toCharArray();
        
        Random random = new Random();
        char[] buf = new char[N];
        
        for (int idx = 0; idx < buf.length; ++idx)
            buf[idx] = _chars[random.nextInt(_chars.length)];
        
        return new String(buf);
    }
    
    public static String make() {
        return make(20);
    }
}