Matt8541

Hello, First post here. Question is in regards to Big-O. I'm wondering if a method calls another method which is O(n), does this method become O(n) as well. If not, why not? It seems that it should be. Here's an example (and my professor marked this as O(1), but it calls an O(n)) public void push (T element) { if (size() == stack.length) expandCapacity(); stack[top] = element; top++; } private void expandCapacity() { T[] larger = (T[])(new Object[stack.length*2]); for (int index=0; index < stack.length; index++) larger[index] = stack[index]; stack = larger; } So why is the push function not O(n)?