title: How to initialise BigInteger after creating instantces (constructor can't be called)
body: <p>Imagine an instance of <code>BigInteger</code>, then how to initialize it after creating instance?</p>
  
  <p>For example:</p>
  
  <pre><code>BigInteger t = new BigInteger();
  </code></pre>
  
  <p>How to put a value in <code>t</code>?</p>
  
  <p>If the constructor cannot be called, then what can be done, to put the value in the object?</p>