Print all the anagrams present in a list of words. Usage: java Anagarams < /usr/share/dict/words

Anagrams.java

import java.util.Arrays;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Scanner;
import java.util.Set;

public class Anagrams {
    public static void main(String[] args) {
        Map<String, Set<String>> anagrams = new HashMap<String, Set<String>>();
        Scanner scanner = new Scanner(System.in);
        while (scanner.hasNext()) {
            String word = scanner.next().toLowerCase();
            char[] letters = word.toCharArray();
            Arrays.sort(letters);
            String key = new String(letters);
            if (anagrams.get(key) == null) {
                Set<String> values = new HashSet<String>();
                values.add(word);
                anagrams.put(key, values);
            } else {
                Set<String> values = anagrams.get(key);
                values.add(word);
            }
        }

        for (Map.Entry<String, Set<String>> entry : anagrams.entrySet()) {
            if (entry.getValue().size() == 1) continue;
            for (String s : entry.getValue()) {
                System.out.print(s + " ");
            }
            System.out.println();
        }
    }
}