Anagrams

public class Solution {
    public ArrayList<String> anagrams(String[] strs) {
        // Start typing your Java solution below
        // DO NOT write main() function
        int len = strs.length;
        ArrayList<String> result = new ArrayList<String>();
        Map<String, ArrayList<String>> sorted = new HashMap<String, ArrayList<String>>();
        
        for(int i = 0; i < len; i++){
            String tmp = strs[i];
            String sort = sortStr(tmp);
            if(sorted.get(sort) != null){
                sorted.get(sort).add(tmp);
            } else {
                ArrayList<String> list = new ArrayList<String>();
                list.add(tmp);
                sorted.put(sort, list);
            }
        }
        
        Iterator iter = sorted.values().iterator();
        while(iter.hasNext()){
            ArrayList<String> list = (ArrayList<String>)iter.next();
            if(list.size() > 1){
                result.addAll(list);
            }
        }
        
        return result;
    }
    
    public String sortStr(String str){
        char[] c = str.toCharArray();
        Arrays.sort(c);
        return new String(c);
    }
}