This code takes in a document `doc1.txt` and then spits out the frequency of each word in the document.

Distance.java

import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.HashMap;
import java.nio.charset.Charset;
import java.util.List;
import java.util.StringTokenizer;
import java.io.IOException;

class Distance {
    public static void main(String[] args) throws IOException {
        HashMap<String, Integer> doc1 = new HashMap<String, Integer>();
        List<String> lines = Files.readAllLines(Paths.get("doc1.txt", ""), Charset.defaultCharset());
        for (String line : lines) {
            StringTokenizer words = new StringTokenizer(line, " ");
            while (words.hasMoreTokens()) {
                String token = words.nextToken();
                if (doc1.containsKey(token)) {
                    int count = doc1.get(token);
                    count++;
                    doc1.put(token, count);
                } else {
                    doc1.put(token, 0);
                }
            }
        }
        System.out.println(doc1.toString());
    }
}