help with java problem
<p>this is a question for my school work i dont want the complete answer but how i should go about doing each part or help clarifying what the question is asking for</p>

<blockquote>
  <p>In the following method, the call to <code>getCreditCardNumber()</code> may throw an <code>InvalidLengthException</code>,  a <code>NonNumericException</code> or  an <code>InvalidCardNumberException</code>. Modify the method to do the following:<br>
  a. Catch the <code>InvalidLengthException</code> and print the message “Card number must be 16 digits.”<br>
  b. Catch the <code>NonNumericException</code> and print the message “Card number must be numbers only.”<br>
  c. Pass the <code>InvalidCardNumberException</code> on to the calling method. In other words, don’t catch it, but let any calling method that uses this method know that it may throw <code>InvalidCardNumberException</code>.</p>
</blockquote>

<pre><code>public void getOrderInformation() 
{
    getCreditCardNumber();
}
</code></pre>
