Android :: Load Specific Lines Of Code According To OS Version?

Is there a simple line of code that would allow only loading the code if the OS version meets the requirements? Lets say I have my target OS as 2.2 but the min sdk is 3 for android 1.5 so even if i have some code in my project that isn't compatable with 1.5 it will still compile since the target OS is 2.2. Anyway, I want to ad a feature that requires code that's not in the 1.5 SDK and will cause a crash if it's loaded on a 1.5 phone. Is there a simple thing like this that I can do? So i dont have to make the entire app not available to 1.5 users?

if (Android OS == >2.1){
//Insert code here that requires 2.1 and up}
else{
//insert code that would appear is OS is <2.1}