Full Code: http://pastebin.com/UghV3xdT
I have 2 practically identical methods that can only different by one if-statement: if (k % 3 != 1) and if(k % 2 == 0).
int k = 0;
while(k<50){
if(k % 3 != 1){ // OR if(k % 2 == 0)
// Code logic goes here
k++;
}
}
The use of each cases is determined by the length of an Array which means the specific case only has to be determined 1 time. 'k' represents the index of another array and 50 is the length of this Array.
I could write something like if(foo > 1 ? k % 3 != 1 : k % 2 == 0) but that requires the program to do the action every time the loop runs.
In a way I would like a sort of updating boolean. Is there any way to do this, or is this the downside of pass-by-value? Should I keep two seperate methods or am I better of with using the ternary operator?
In essence I'm looking for a type that contains the expression rather than the value.
In Java 8 there is nice functional interface called IntPredicate. If you combine it with lambda expressions, you can achieve your goal with no duplication, extra code or any slow downs:
public final class Example {
public static void main(String[] args) {
//Instead of randomly choosing the predicate, use your condition here
Random random = new Random();
IntPredicate intPredicate = random.nextBoolean() ? i -> i % 2 == 0 : i -> i % 3 != 1;
int k = 0;
while(k<50){
/*
*At this point the predicate is either k%2==0 or k%3!=1,
* depending on which lambda you assigned earlier.
*/
if(intPredicate.test(k)){
// Code logic goes here
k++;
}
}
}
}
PS: Please not that I use the random boolean value to switch between the predicates, but you can use whatever condition you have