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    copied!<p>John, you might consider using a more modular approach; I find this helps me organize my thoughts.</p> <p>You might have a method like the following:</p> <pre><code>public String findLongestDuplicatedSubstring(String text) { List&lt;String&gt; substrings = findAllSubstrings(text); List&lt;String&gt; duplicatedSubstrings = findDuplicated(substrings); String longest = findLongest(duplicatedSubstrings); return longest; } </code></pre> <p>I realize this is homework, so I will avoid filling in the methods this one calls. However, as an advocate of test-driven development, I'd suggest you consider using a JUnit test to help you confirm each of these smaller methods. This approach might help you isolate any issues you might have. Here is a start for some test methods:</p> <pre><code>@Test public void testFindLongestDuplicatedSubstring() { assertEquals("ab", findLongestDuplicatedSubstring("abcab")); } @Test public void testFindDuplicated() { List&lt;String&gt; substrings = new ArrayList&lt;String&gt;(); substrings.add("a"); substrings.add("ab"); substrings.add("abc"); substrings.add("abca"); substrings.add("abcab"); substrings.add("b"); substrings.add("bc"); substrings.add("bca"); substrings.add("bcab"); substrings.add("c"); substrings.add("ca"); substrings.add("cab"); substrings.add("a"); substrings.add("ab"); substrings.add("b"); assertEquals(3, findDuplicated(substrings).size()); } @Test public void testFindAllSubstrings() { List&lt;String&gt; substrings = new ArrayList&lt;String&gt;(); substrings.add("a"); substrings.add("ab"); substrings.add("abc"); substrings.add("abca"); substrings.add("abcab"); substrings.add("b"); substrings.add("bc"); substrings.add("bca"); substrings.add("bcab"); substrings.add("c"); substrings.add("ca"); substrings.add("cab"); substrings.add("a"); substrings.add("ab"); substrings.add("b"); assertEquals(substrings, findAllSubstrings("abcab")); } @Test public void testFindLongest() { List&lt;String&gt; strings = new ArrayList&lt;String&gt;(); strings.add("a"); strings.add("b"); strings.add("ab"); assertEquals("ab", findLongest(strings)); } </code></pre>
 

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