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POIssue with ArrayList<ArrayList<String>>
 

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    <p>This code was EDITED according to advice from trutheality.</p> <p>I am having trouble coming up with a good title for this one - if you have a better idea please feel free to change it.</p> <p>I am creating a two dimensional ArrayList. For that I fill up an <code>ArrayList&lt;String&gt;</code> and then add it to <code>ArrayList&lt;ArrayList&lt;String&gt;&gt;</code>. I do that inside a loop and I was hoping to get a fresh <code>ArrayList&lt;String&gt;</code> every time. This doesn't happen so <code>ArrayList&lt;ArrayList&lt;String&gt;&gt;</code> gets filled up with <strong>accumulations</strong> of <code>ArrayList&lt;String&gt;</code> because each time I fill up <code>ArrayList&lt;String&gt;</code> it just adds the what it already has.</p> <pre><code>ArrayList&lt;String&gt; oneD = new ArrayList&lt;String&gt;(); ArrayList&lt;ArrayList&lt;String&gt;&gt; twoD= new ArrayList&lt;ArrayList&lt;String&gt;&gt;(); Cursor tSCursor = retrieveTS(tId); tSCursor.moveToFirst(); for (int i = 0; i &lt; tSCursor.getCount(); i++) { stockId = tSCursor.getString(tSCursor.getColumnIndex("_id")); oneD.add(sId); oneD.addAll(retrieveSFinParams(sId)); twoD.add(sFinParams); tSCursor.moveToNext(); } </code></pre> <p>I tried sFinParams.clear() but as Java users references in the containers, when I use clear() I also loose the values in the 2D ArrayList.</p> <p>How can I get a fresh ArrayList each time so when I full up the 2D ArrayList I don't duplicate the contents of the 1D ArrayList?</p> <p>I appreciate any help, D</p>
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    1. COWhen you make arraylists of arraylists, it means you lack a class. OOP code avoids those questions.
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      1. USDenys Séguret
    2. CODid you vote it down? I wouldn't say it's a bad question, just misinformed...
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      1. USTharwen
    3. COYour code is a bit hard to understand (for example, what on earth is sFinParams? and where do you use your ArrayLists?). Can you give a simpler example of what you're trying to achieve?
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      1. USHedja
 

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