How to store list of values using hashmap? using following format
<p>How to do Hashmap i have list of value like</p>

<pre><code>{"tname":"Learning Ratio and Proportion Concepts and practice assessment","gname":"Sixth grade"},
{"tname":"Number System","gname":"Sixth grade"},
{"tname":"quations and expression","gname":"Seventh grade"},{"tname":"Geometry","gname":"Seventh grade"}
</code></pre>

<p>i want to store as</p>

<pre><code>list&lt;String&gt;={"Sixth grade","Seventh grade"}

list(list&lt;String&gt;)={{"Learning Ratio and Proportion Concepts and practice assessment","Number System"},{"quations and expression","Geometry"}}
</code></pre>

<p>can any one help me thanks...</p>
