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POI need to find the object quickly while using as little memory as possible. What data container should I use?
 

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    <p>My program need insert <strong>more than millions of record</strong> to the data container. I tried <strong>hashmap</strong> and <strong>treemap</strong>. Both will give me <strong>Heap space exception</strong> to me although I allow the <strong>JVM to use 2gb ram.</strong></p> <p>My program frequently gets specific data from the container which I think <strong>if it takes O(logn) time will be acceptable</strong> to me. So what container should I use? Or I need to implement one? How? </p> <p><strong>More Details:</strong> the key is String, like a global ID e.g "00011123459" sth like that. Then the key will map to a list of list i.e <code>List&lt;List&lt;String&gt;&gt;</code>. My program readLine from the file, then change the line into list, then get the global id from the list, then put the list into corresponding list of list. The file has more than millions of line, that's why I believe the main reason is I create too much lists. However, I cannot add more memory to the machine.</p>
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    1. COWhat is the type of your keys. Are they strings or numbers?
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      1. USAndrey Chaschev
 

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