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Please post your declaration of 'map'<br />
<br />
If it's all right then your code will work without warnings <i>or casting</i> (renamed to 'things' to avoid confusion)<br />
<br />

<pre><code id="code-20-42647619-1">Map&lt;String, Map&lt;String, String&gt;&gt; things = new HashMap&lt;&gt;();
Map&lt;String, String&gt; columns = things.get(&quot;columns&quot;);</code></pre>
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Please post your declaration of 'map'

If it's all right then your code will work without warnings or casting (renamed to 'things' to avoid confusion)



Map<String, Map<String, String>> things = new HashMap<>();
Map<String, String> columns = things.get("columns");

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Yes, it can help me.<br />
-Thanks-
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<div class="content wysiwyg-content">
Getting &quot;Type safety: Unchecked cast from Object to Map&lt;String, String&gt;&quot; warning during the typecasting. <br />
<br />
Could you guide me how I can resolve it?. &nbsp;Please check below-mentioned code:-<br />
<br />
<b>Map&lt;String, String&gt; columns = ((Map&lt;String, String&gt;) map.get(&quot;columns&quot;));</b>
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Getting "Type safety: Unchecked cast from Object to Map<String, String>" warning during the typecasting. 

Could you guide me how I can resolve it?.  Please check below-mentioned code:-

Map<String, String> columns = ((Map<String, String>) map.get("columns"));

Type safety: Unchecked cast from Object to Map&lt;String,String&gt;

Java is a platform-independent, object-oriented programming language and run-time environment, designed to have as few implementation dependencies as possible such that developers can write one set of code across all platforms using libraries. Most devices will not run Java natively, and require a run-time component to be installed in order to execute a Java program.

Type safety: Unchecked cast from Object to Map&lt;String,String&gt;

Type safety: Unchecked cast from Object to Map<String,String>