Concise word frequency script in Java: http://hopsage.blogspot.com/2012/11/evidence-that-java-should-be-avoided-in.html

WordFreq.java

import java.io.*;
import java.util.*;

import com.google.common.collect.*;

public class WordFreq {
	public static void main(String[] args) throws FileNotFoundException {
		final HashMultiset<String> counts = HashMultiset.create(
				ImmutableList.copyOf(new Scanner(new File(args[0]))));
		
		List<String> words = Lists.newArrayList(counts.elementSet());
		Collections.sort(words, new Comparator<String>() {
			public int compare(String l, String r) {
				return counts.count(r) - counts.count(l);
			}});
		
		for(String word : words.subList(0, Integer.parseInt(args[1]))){
			System.out.println(word + " : " + counts.count(word));
		}
	}
}