`if` condition efficiency
java, performance
Solution
The `&&` operator (and also `||`) is a short-circuit operator in Java.
That means that if `a` is `false`, Java doesn't evaluate `b`, `c`, `d` etc., because it already knows the whole expression `a && b && c && d && e && f && g` is going to be `false`.
So there is nothing to be gained to write your `if` as a series of nested `if` statements.
The only good way to optimize for performance is by measuring the performance of a program using a profiler, determining where the actual performance bottleneck is, and trying to improve that part of the code. Optimizing by inspecting code and guessing, and then applying micro-optimizations, is usually not an effective way of optimizing.
Problem
I'm working on improving the performance of a `Java` program. After I've improved the `data structures` and the algorithm's complexity, I'm trying to improve the implementation. I want to know if it really matters how I use the `if` statement in condition. Does the compiler treat these two versions the same? Do they cost the same (If I have much more variables inside the `if` statement)? ``` if(a && b && c && d && e && f && g) ``` OR ``` if(a) if(b) if(c) if(d) if(e) if(f) if(g) ``` (In this specific project I don't really care about readability, I know the second is less readable)