This program takes a text file with a list of words and checks how many words can be formed with the letters provided by command line argument.

AnagramFinder.java

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;

import org.apache.commons.lang.StringUtils;


public class AnagramFinder {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		
		if(args.length == 2) {
			
			AnagramFinder.findAnagrams(args[0], new File(args[1]));
		}
		else {
			
			System.out.println("Invalid number of arguments!");
		}
	}
	public static boolean isAnagram(String word, char[] validLetters) {
		
		ArrayList<String> currentChars = new ArrayList<String>();
		char[] wordChars = word.toCharArray();
		
		for(char _char : wordChars)
			currentChars.add(String.valueOf(_char));
		
		int validLetterCount = 0;
		
		for(char _char : validLetters) {
			String value = String.valueOf(_char);
			
			if(currentChars.contains(value))
				validLetterCount++;
								
			currentChars.remove(value);
		}
		
		return validLetterCount == word.length();
	}
	
	public static void findAnagrams(String word, File wordsFile) {
		
		try {
			System.out.println("Reading file");
			
			BufferedReader reader = new BufferedReader(new FileReader(wordsFile));
			
			char[] validLetters = word.toCharArray();
			
			System.out.println("Searching anagrams");

			ArrayList<String> lines = new ArrayList<String>();
			String line;
			while((line = reader.readLine()) != null)
				if(line.length() == word.length())
					if(isAnagram(line, validLetters))
						System.out.println("Anagram found: " + line);
		} 
		catch (FileNotFoundException e) {
			System.out.println("Could not find file!");				
		} 
		catch (IOException e) {
			// TODO Auto-generated catch block
			System.out.println("Could not process file!");
		}
	}

}