I think either internal representation is fine. It would be nice if there was a Matrix interface you could code against so it wouldn't matter. Then you could swap out implementations if one turned out to be faster. If you play around with a language like C, you'll find out that multidimensional arrays are actually just abstractions over a range of memory anyway, similar to your code. But you want to make sure that you iterate in such a way that you're going straight through the underlying array or else your code could be way slower than it needs to be. Some code review: I would move your Transposition logic into the enum. It could look like the Planets enum here https://docs.oracle.com/javase/tutorial/java/javaOO/enum.html but with your lambda expressions as the constructor parameters and fields. Also since a Transposition is essentially the same thing as an IntToDoubleFunction your transpose method could be coded against that. That would be more flexible since you could then support any arbitrary Transposition on the fly. Or for clarity interface Transposition extends IntToDoubleFunction {} enum Transpositions implements Transposition {... Or check this out https://mcvalls.medium.com/how-to-implement-the-strategy-pattern-with-enums-in-java-19eb7168c247 More on reddit.com

Thanks for all the replies, I had to hand over my project before any of the replies ticked in. But i read them now so thanks guys. I just ended up making a "flattened array" of generics and just convert them. I used this method to find the index: public int finnIndeks(int x, int y){ return (x+hight*y); } And from my "get" method i just converted from non-generic to generic sort of: public E hent(int x, int y){ return (E) tabell[finnIndeks(x, y)]; } I guess this is not the best way to go about this problem. But it certainly was the simplest. It's an unchecked cast from object E so thats sort of bad. More on reddit.com

Something like this? const [arr2, arr3] = arr.reduce((acc, val) => { acc[0].push(val[0]); acc[1].push(val[1]); return acc; }, [[],[]]); // Or: const arr2 = arr.map(val => val[0]); const arr3 = arr.map(val => val[1]); More on reddit.com

which takes some values (such as name, date, Id) That sounds awfully like you actually should not store this in an array but rather in a class (or since Java 14 in a record). i need to transfer that arrays contents into a bigger array(LoanArray), Even more hints that you should use proper OOP here. OP, be way more descriptive and explain the use case as well as the surroundings. Your explanation is quite vague. With the vague explanation of yours all we can say is: 2d arrays in Java are just arrays of arrays. If they have the same data type, you can directly set a row (actually the outer dimension) to a 1d array. More on reddit.com