title: Java: Adding large numbers without using BigInteger
body: <p>I have looked at the other examples of these questions asked on this website, but they are all quite more complex than I know how to deal with and use. Basically, how do I sum large numbers, or even store large numbers to sum them later, without the use the of BigInteger class? The numbers are so large they won't even fit into long. </p>
  
  <p>The idea I have now is to use a character array, but I have no idea how to to addition with super large numbers even if I am able to store the numbers in a character array. Any help would be great. Thank you.</p>