This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.

If the method just calls the two operations one after the other, then yes, the result is O(n).

If the method has loops or if statements, the result may be different. For example if it loops n times and calls one or more O(n) operations, the result is O(n^2).