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copied!<p>You're being a bit ambiguous about what you want. If you want to lookup a value based on a given key, then store the pairs in a <a href="http://download.oracle.com/javase/6/docs/api/java/util/HashMap.html" rel="nofollow">HashMap</a> (faster) or <a href="http://download.oracle.com/javase/6/docs/api/java/util/Hashtable.html" rel="nofollow">Hashtable</a> (slower but thread-safe). </p> <p>Primitive arrays (and more advanced <a href="http://download.oracle.com/javase/6/docs/api/java/util/List.html" rel="nofollow">List</a>-based collections such and <a href="http://download.oracle.com/javase/6/docs/api/java/util/ArrayList.html" rel="nofollow">ArrayList</a> or <a href="http://download.oracle.com/javase/6/docs/api/java/util/Vector.html" rel="nofollow">Vector</a>) don't work with name-value pairs out of the box. They are simply, well... lists. Primitive arrays can offer a bit more performance, since you avoid creating objects, but the more advanced List-type collections can be safer and more flexible. </p> <p>Still, it sounds (?) like you want a <a href="http://download.oracle.com/javase/6/docs/api/java/util/Map.html" rel="nofollow">Map</a> type collection rather <a href="http://download.oracle.com/javase/6/docs/api/java/util/List.html" rel="nofollow">List</a> type one.</p> <p><strong>UPDATE</strong>: By the way, if you use a Map then you can still work with a list of all your "rId" values. It will be a <a href="http://download.oracle.com/javase/6/docs/api/java/util/Set.html" rel="nofollow">Set</a> datatype actually, but that's just a special cousin of List that doesn't allow duplicates:</p> <pre><code>Map<String, String> myMap = new HashMap<String, String>(); myMap.put("rId11","image3"); // ... additional put's for the other values Set<String> myRids = myMap.keySet(); for(String rId : myRids) { // do whatever you want with each rId one-by-one, etc // You could also use "myRids.iterator()" to work with an Iterator instead } </code></pre>

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