Как я могу использовать "." как разделитель с String.split() в java

То, что я пытаюсь сделать, это прочитать файл .java и выбрать все идентификаторы и сохранить их в списке. Моя проблема связана с методом .split(). Если вы запустите этот код так, как есть, вы получите ArrayOutOfBounds, но если вы измените разделитель на "." ко всему прочему, код работает. Но мне нужно, чтобы строки обрабатывались символом ".". так есть ли другой способ, которым я мог бы это сделать?

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.*;


public class MyHash {
    private static String[] reserved = new String[100];
    private static List list = new LinkedList();
    private static List list2 = new LinkedList();

    public static void main (String args[]){
        Hashtable hashtable  = new Hashtable(997);
        makeReserved();
        readFile();
        String line;
        ListIterator itr = list.listIterator();
        int listIndex = 0;
        while (listIndex < list.size()) {

            if (itr.hasNext()){
                line = itr.next().toString();
                //PROBLEM IS HERE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
                String[] words = line.split(".");  //CHANGE THIS AND IT WILL WORK
                System.out.println(words[0]);      //TESTING TO SEE IF IT WORKED
            }
            listIndex++;
        }
    }

    public static void readFile() {
        String text;
        String[] words;
        BufferedReader in = null;
        try {
            in = new BufferedReader(new FileReader("MyHash.java")); //NAME OF INPUT FILE


        } catch (FileNotFoundException ex) {
            Logger.getLogger(MyHash.class.getName()).log(Level.SEVERE, null, ex);
        }
        try {
            while ((text = in.readLine()) != null){
                text = text.trim();
                words = text.split("\\s+");
                for (int i = 0; i < words.length; i++){
                    list.add(words[i]);
                }
                for (int j = 0; j < reserved.length; j++){
                    if (list.contains(reserved[j])){
                        list.remove(reserved[j]);
                    }
                }


            }

        } catch (IOException ex) {
            Logger.getLogger(MyHash.class.getName()).log(Level.SEVERE, null, ex);
        }
        try {
            in.close();
        } catch (IOException ex) {
            Logger.getLogger(MyHash.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

    public static int keyIt (int x) {
        int key = x % 997;
        return key;
    }

    public static int horner (String word){
        int length = word.length();
        char[] letters = new char[length];

        for (int i = 0; i < length; i++){
            letters[i]=word.charAt(i);
        }

        char[] alphabet = new char[26];
        String abc = "abcdefghijklmnopqrstuvwxyz";

        for (int i = 0; i < 26; i++){
            alphabet[i]=abc.charAt(i);
        }

        int[] numbers = new int[length];
        int place = 0;
        for (int i = 0; i < length; i++){
            for (int j = 0; j < 26; j++){
                if (alphabet[j]==letters[i]){
                    numbers[place]=j+1;
                    place++;

                }
            }
        }

        int hornered = numbers[0] * 32;

        for (int i = 1; i < numbers.length; i++){

            hornered += numbers[i];
            if (i == numbers.length -1){
                return hornered;
            }
            hornered = hornered % 997;
            hornered *= 32;
        }
        return hornered;
    }

    public static String[] makeReserved (){
        reserved[0] = "abstract";
        reserved[1] = "assert";
        reserved[2] = "boolean";
        reserved[3] = "break";
        reserved[4] = "byte";
        reserved[5] = "case";
        reserved[6] = "catch";
        reserved[7] = "char";
        reserved[8] = "class";
        reserved[9] = "const";
        reserved[10] = "continue";
        reserved[11] = "default";
        reserved[12] = "do";
        reserved[13] = "double";
        reserved[14] = "else";
        reserved[15] = "enum";
        reserved[16] = "extends";
        reserved[17] = "false";
        reserved[18] = "final";
        reserved[19] = "finally";
        reserved[20] = "float";
        reserved[21] = "for";
        reserved[22] = "goto";
        reserved[23] = "if";
        reserved[24] = "implements";
        reserved[25] = "import";
        reserved[26] = "instanceof";
        reserved[27] = "int";
        reserved[28] = "interface";
        reserved[29] = "long";
        reserved[30] = "native";
        reserved[31] = "new";
        reserved[32] = "null";
        reserved[33] = "package";
        reserved[34] = "private";
        reserved[35] = "protected";
        reserved[36] = "public";
        reserved[37] = "return";
        reserved[38] = "short";
        reserved[39] = "static";
        reserved[40] = "strictfp";
        reserved[41] = "super";
        reserved[42] = "switch";
        reserved[43] = "synchronize";
        reserved[44] = "this";
        reserved[45] = "throw";
        reserved[46] = "throws";
        reserved[47] = "trasient";
        reserved[48] = "true";
        reserved[49] = "try";
        reserved[50] = "void";
        reserved[51] = "volatile";
        reserved[52] = "while";
        reserved[53] = "=";
        reserved[54] = "==";
        reserved[55] = "!=";
        reserved[56] = "+";
        reserved[57] = "-";
        reserved[58] = "*";
        reserved[59] = "/";
        reserved[60] = "{";
        reserved[61] = "}";

        return reserved;
    }
}