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    <p>The following two lines are identical (to the compiler), this is true even if you have a class called <code>Value</code> as the named parameter will mask the class type</p> <pre><code>class RowList&lt;Value&gt; extends ArrayList&lt;List&lt;Value&gt;&gt; class RowList&lt;T&gt; extends ArrayList&lt;List&lt;T&gt;&gt; </code></pre> <p>The reason for this is because value inside the first <code>&lt;&gt;</code> is a named type parameter. So when you attempt to do something like</p> <pre><code>class RowList&lt;List&lt;Value&gt;&gt; extends ArrayList&lt;List&lt;Value&gt;&gt; </code></pre> <p>You have attempted to create a named type paramter <code>List&lt;Value&gt;</code> which (in Java) is an invalid identifier, but instead you will get an error something like <code>Syntax error on token(s), misplaced construct(s)</code></p> <p>I think instead you are really trying to write</p> <pre><code>public class RowList extends ArrayList&lt;Value&gt; { @Override public boolean add(Value e) { // TODO Custom code to check and what not return super.add(e); } } </code></pre> <p>Where <code>Value</code> is a custom object in your codebase. Then elsewhere in your code you can do:</p> <pre><code>RowList rl = new RowList(); rl.add(new Value(...)); Value v = rl.get(i); </code></pre> <p><strong>EDIT:</strong></p> <p>The previous example assumes that the <code>Value</code> class is an entry row of data. If instead it is a single item of data, and the row is represented by a <code>List</code> then it would be more like the following:</p> <pre><code>public class RowList extends ArrayList&lt;List&lt;Value&gt;&gt; { @Override public boolean add(List&lt;Value&gt; e) { // TODO Custom code to check and what not return super.add(e); } } RowList rl = new RowList(); List&lt;Value&gt; row = new ArrayList&lt;Value&gt;(); row.add(new Value(...)); rl.add(row); List&lt;Value&gt; rowGet = rl.get(i); </code></pre>
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    1. COYeah, Value is an object in my code. Using the class RowList extends ArrayList<List<Value>> declaration, how do I access the values within RowList?
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    2. CO@user2282497: See edits
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