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    <p>Given a vague question, I have to guess a lot, but perhaps it's something like this you're looking for:</p> <pre><code>import java.util.*; public class Test { static Map&lt;Integer, Integer&gt; groups = new HashMap&lt;Integer, Integer&gt;(); public static void main(String... args) { groups.put(1, 2); groups.put(2, 3); groups.put(2, 4); groups.put(4, 5); System.out.println(searchFor(1, 5)); } private static String searchFor(int from, int target) { // Target found? if (from == target) return "" + target; // Dead end? if (!groups.containsKey(from)) return null; // Recurse and try to find it from here. String path = searchFor(groups.get(from), target); return path == null ? null : from + " -&gt; " + path; } } </code></pre> <p><strong>Output:</strong> 1 -> 2 -> 4 -> 5</p> <hr> <p>Or something like this:</p> <pre><code> static Map&lt;Integer, Group&gt; groups = new HashMap&lt;Integer, Group&gt;(); public static void main(String... args) { groups.put(0, new Group(1, "hello")); // (0: -) -&gt; (1: "hello") groups.put(2, new Group(9, "!")); // (2: "world") -&gt; (9, "!") groups.put(3, new Group(5, "bye")); // (3: -) -&gt; (5, "bye") groups.put(1, new Group(2, "world")); // (1: "hello") -&gt; (2: "world") System.out.println(traverse(0)); } private static String traverse(int from) { if (!groups.containsKey(from)) return ""; String path = traverse(groups.get(from).idGroupe); return path == null ? null : groups.get(from).word + " " + path; } } </code></pre> <p>Which prints:</p> <pre><code>hello world ! </code></pre>
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    1. POHelp using recursion in Java
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    1. COjust search for the first element (key) of yur map example search for 1 Output->1 have 2 , 2 is a Key and have 3 and stop because 3 is not a key of map
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    2. COwoho, I won the guessing game...
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