<div>
Bijay,<br />
<br />
Since Java version 7, you no longer have to say &lt;Number&gt; the second time. Instead, you can use the &quot;diamond&quot; operator &lt;&gt;&nbsp;and save some typing. The problem here is the cast.
</div>


Bijay,

Since Java version 7, you no longer have to say <Number> the second time. Instead, you can use the "diamond" operator <> and save some typing. The problem here is the cast.

<div>
I wonder why the author did the casting orignially in the document i read. Is there is aplace or necessity of casting ArrayList to List at all?<br />
please advise
</div>


I wonder why the author did the casting orignially in the document i read. Is there is aplace or necessity of casting ArrayList to List at all?
please advise

<div>
I can't think of a situation where that cast makes sense; it may just be a typo.
</div>


I can't think of a situation where that cast makes sense; it may just be a typo.

<div>
<div class="content wysiwyg-content">
<blockquote>
 public static void main(String... aArgs){<br />
&nbsp; &nbsp; List&lt;Number&gt; numbers = (List&lt;Number&gt;) new ArrayList&lt;&gt;();
</blockquote>
<br />
<br />
above line giving below error. I wonder what it means. How to fix it. Please advise.
</div>
</div>


 public static void main(String... aArgs){
    List<Number> numbers = (List<Number>) new ArrayList<>();


above line giving below error. I wonder what it means. How to fix it. Please advise.

array list error

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.