How to replace first few characters in java?
<p>I have a situation where i have to replace first 4 characters of a string to 'x'.</p>

<p>The original data is '12345678'. I want to replace to 'xxxx5678'.</p>

<p>I am actually using Jasper Reports and this is my field:</p>

<pre><code>$F{obj.contact_id.hisher_member_id}
</code></pre>

<p>Any suggestion will be highly appreciated.</p>