word occurrences

[Alpdog14]

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.

@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:

@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.