title: BigInteger(long) has private access in BigInteger
body: <p>I am trying to store a big calculation in a BigInteger instance. I tried this :</p>
  
  <pre><code>BigInteger answer=new BigInteger(2+3);
  </code></pre>
  
  <p>and got the following error :</p>
  
  <pre><code>temp.java:17: error: BigInteger(long) has private access in BigInteger
                          BigInteger answer=new BigInteger(2+3);
                                            ^
  1 error
  </code></pre>
  
  <p>I know that instead of "2+3" there should be a string value. But i don't know how to satisfy that condition(assuming that i don't how much 2+3 is). Please tell me how to assign a calculated value to BigInteger object(assign 2+3 to BigInteger answer).</p>