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PORecursively create objects
 

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    <p>I'm trying run my method recursively. In each iteration of method I create new <code>ArrayList</code> and fill it some values and check some condition in <code>if</code> operator. If it's true, will run this method again. If it's false, I want exit of current iteration of method and work in previous iteration of method with previous copy of <code>ArrayList</code>. In practice, when I get false in condition and go in previous iteration of my method, I work with same <code>ArrayList</code>. And it's bad.</p> <p>How do I create each instance of <code>ArrayList</code> for each iteration of method and when follow back in previous method work with instance of that iteration of <code>ArrayList</code>?</p> <p>My code:</p> <pre><code> private List&lt;List&lt;String&gt;&gt; letsTry(List&lt;List&lt;ProbableValue&gt;&gt; probableValues, List&lt;List&lt;String&gt;&gt; data) { List&lt;List&lt;String&gt;&gt; copyOfData = new ArrayList&lt;List&lt;String&gt;&gt;(data); List&lt;List&lt;ProbableValue&gt;&gt; copyOfProbableValues = new ArrayList&lt;List&lt;ProbableValue&gt;&gt;(probableValues); ProbableValue minPV = getMinPV(copyOfProbableValues); Set&lt;String&gt; pValues = new HashSet&lt;String&gt;(minPV.getProbableValues()); int i = minPV.getI(); int j = minPV.getJ(); for (String v : pValues) { if (checker.canSetOnTable(copyOfProbableValues, minPV)) { if (!SUtils.isItsNumber(copyOfData.get(i).get(j))) { copyOfData.get(i).set(j, v); copyOfProbableValues.get(i).get(j).getProbableValues().clear(); checker.removeProbableValue(copyOfProbableValues, v, i, j); } letsTry(new ArrayList&lt;List&lt;ProbableValue&gt;&gt;(copyOfProbableValues), new ArrayList&lt;List&lt;String&gt;&gt;(copyOfData)); } } return copyOfData; } </code></pre>
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