Map<String, Integer> map = new LinkedHashMap<>();
BufferedReader br = new BufferedReader(new FileReader(new File(("test.txt"))));
String line = ""; String[] words;
while((line = br.readLine()) != null){
    words = line.split(" ");
    for(String word : words){
        if(map.containsKey(word)){
            map.put(word, map.get(word)+1);
        }else{
             map.put(word, 1);
        }
    }
}
System.out.println(map);