Type-check in method of child class
<p>In Java, I have parent <code>class P</code> and a child <code>class C.</code></p>

<p>In an <strong>abstract class</strong>, I have a method <code>void blah(P parent)</code>. In a <strong>child class of the abstract class</strong>, it doesn't compile by having <code>void blah(C child)</code>.</p>

<p>How do I achieve the type check in the child class? </p>
