HashMap storing duplicates ?

Hi,

this is really strange . I did a program using hashmap to store word and frequencies and what i got as output if the line cat cat mouse
is this

{ cat , cat , mouse=1}

The part of the program is below. I cant seem to find the bug.  Could anyone pls look at it ? I always thought that map does not allow duplicates..but

public static void main(String []args)
{
Scanner reader;
StringTokenizer tokens;
String[] wordList;
HashMap<String,Integer> hm=new HashMap<String,Integer>();
Collections c;

if(args.length!=1)
System.err.println("Incorrect number of arguments passed..Exiting..");

else{

try{
reader=new Scanner(new File(args[0]));
while(reader.hasNextLine())

try{
reader=new Scanner(new File(args[0]));
while(reader.hasNextLine())
{
wordList=reader.nextLine().split(",.\n");

for(String word:wordList)
{
if(hm.get(word)!=null)
{
Integer value=hm.get(word);
value=value+1;
hm.put(word,value);
}
else
{
Integer value=1;
hm.put(word,value);
}
}