Java Random with System.nanoTime()

I'm trying to generate meaningless words without using any Random() functions. I figured out that i can use current clock or mouse coordinate. And i picked to use current clock. Here is the code i wrote.

private final char[] charray = {'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z',
    'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'};

private char getRandomCharacter(){
    return charray[random(charray.length)];
}

private int random(int value){
    value =(int) System.nanoTime()% 52;
    return value;
}

protected Randomizer(){
    boolean running = true;
    int count = 0;
    int max = 5;
    while(running){
        StringBuilder sb = new StringBuilder();
        int size = random(25) + random(25);
        for (int i = 0; i < size; i++) {
            sb.append(getRandomCharacter());
        }
        System.out.println("Random Line : " + sb.toString());

        if (count++ == max) {
            running = false;
            System.out.println("All of them are random.");
        }
    }
}

public static void main(String[] args) {
    new Randomizer();
}

I was expecting the out put like : axdlMkjiIfjcmqQopv etc.. but i get something like this : ZNNrrrUUUUxxxxbbbhhhLLLLoooRRRRRvvvYYYYBBBBfffI or JmmmPPKKKKnnnnRRBeeHHHHlllllOOOOrrrVVVVV Why there are too much continious. Is nanoTime too slow for that or what?I used currentTimeMillis before that and it was much worser. I couldn't figured out and couldn't find any source about how to random with current clock. PS: I'm newbie pls dont kill me.