word occurrences

I have posted this in other forums and I am just trying to get the best help I can. I have a word occurrence project I have been stuck on. The pre-written test for the methods are not working so I was wondering if anyone can guide me the right direction. here is what i have and the test that is suppose to pass.

Code:

---

@Override
        public void add(final String word, final int line) {
                // TODO your job
               
               
                add(word,line);
        }
       
        public boolean containsKey (String word, int line){
                if(word == null){
                        return false;
                }
                return true;
        }

        /*
        * (non-Javadoc)
        *
        * @see edu.luc.cs.laufer.index.Index#frequency(java.lang.String)
        */
        @Override
        public int frequency(final String word) {
                // TODO your job
                return -1;
        }

---

Test:

Code:

---

@Test
        public void testAdd() {
                int s = index.containsKey("xyz") ? index.get("xyz").size() : 0;
                index.add("xyz", 5);
                assertTrue(index.get("xyz").contains(5));
                assertEquals(s + 1, index.get("xyz").size());
        }

---

Any help would be most appreciated.