[Solved] Generating a Random String Array

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You can do it using nested loop, as you said in the question:

 public String[] randomArrayString(int length, int numberOfChar) {
    Random random = new Random();
    char[] chars = "abcdefghijklmnopqrstuvwxyz".toCharArray();
    String[] array = new String[length];
    String str;
    for (int i = 0; i < length; i++) {
        str = "";
        for (int j = 0; j < numberOfChar; j++) {
            str+= chars[random.nextInt(chars.length - 1)];
        }
        array[i] = str;
    }
    return array;
}

You can make a solution also using Java 8 Streams, like this:

public Object[] randomArrayString(int length, int numberOfChar){
    Random random = new Random();
    char[] chars = "abcdefghijklmnopqrstuvwxyz".toCharArray();
    return Stream.generate(() -> {
        String str="";
        for (int i = 0; i < numberOfChar; i++) {
            str+= chars[random.nextInt(chars.length - 1)];
        }
        return str;
    }).limit(length).toArray();
}

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solved Generating a Random String Array