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    <p>An array is a container object that holds a fixed number of values of a single type. The length of an array is established when the array is created. After creation, its length is fixed. You are creating an array to hold 0 elements .</p> <pre><code>String s[]=new String[0]; //&lt;&lt; intialized with length 0 </code></pre> <p>It will throw <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/ArrayIndexOutOfBoundsException.html" rel="nofollow noreferrer"><code>ArrayindexoutOfBoundsException</code></a> when you try to access its 1st element <code>s[0]</code>.</p> <blockquote> <p>Thrown to indicate that an array has been accessed with an illegal index. <strong>The index is either negative or greater than or equal to the size of the array.</strong></p> </blockquote> <p>Size the size of your array is <code>0</code> , hence Exception is thrown while accessing index <code>0</code>.</p> <p>Below a basic diagram of an array for understanding.</p> <p><img src="https://i.stack.imgur.com/Gpmn5.gif" alt="enter image description here"></p> <p>It is an array of length <code>10</code> , indexed from <code>0</code> to <code>9</code>.</p> <p>Since you don't know the number of elements your data structure needs to store while declaring the array itself. It is better to use a dynamic <a href="http://docs.oracle.com/javase/tutorial/collections/index.html" rel="nofollow noreferrer">Collection</a> in your case , probably any one of the implementation of <a href="http://docs.oracle.com/javase/7/docs/api/java/util/List.html" rel="nofollow noreferrer">List</a> , like an <a href="http://docs.oracle.com/javase/7/docs/api/java/util/ArrayList.html" rel="nofollow noreferrer">ArrayList</a>.</p> <pre><code>List&lt;String&gt; s = new ArrayList&lt;String&gt;(); while(rs.next()) { s.add(rs.getString("NAME")); // using column name instead of index "1" here } </code></pre> <p><strong>Suggested Reading:</strong></p> <ol> <li><a href="http://docs.oracle.com/javase/tutorial/java/nutsandbolts/arrays.html" rel="nofollow noreferrer">Oracle's tutorial on Java arrays</a></li> <li><a href="https://stackoverflow.com/questions/12321242/lists-vs-arrays-when-to-use-what">Lists vs Arrays - when to use what</a></li> </ol>
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