random text generator in java

/**
 * @author lautturi.com 
 * Java example:
 */

import java.util.*;

public class Lautturi {
	static String randomTextGenerator(int len) {
		String chars = "0123456789"
                + "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
                + "abcdefghijklmnopqrstuvwxyz"
                ;
		
        StringBuilder sb = new StringBuilder(len);
        for (int i = 0; i < len; i++)
            sb.append(chars.charAt(new Random().nextInt(chars.length())));
        return  sb.toString();
	}

	public static void main(String[] args) {
		String  randomString = randomTextGenerator(12);
		System.out.println("random string:"+ randomString);
	}
}