I have a problem where i am trying to swap two arrays so that they switch beginnings.

example: array 1 = (1,2,3,4,5,6,7,8) and array 2 = (11,12,13,14,15,16,17,18) i want to end up with the first array being (11,12,13,14,5,6,7,8) and i want the second array to be (1,2,3,4,15,16,17,18)

but for some reason i end up with 1=(11,12,13,14,5,6,7,8) and 2=(11,12,13,14,15,16,17,18)

my code is provided below, what am i doing wrong?

public static void Mutate(Genetic lowest, Genetic secondLowest) {
    int halfway = (lowest.getPopulation().length)/2;
    int[] one = lowest.getPopulation();
    int[] two = secondLowest.getPopulation();
    int[] temp = secondLowest.getPopulation();
    int[] temp2 = lowest.getPopulation();

    for(int i = 0; i < halfway; i++){
        temp[i] = one[i];
    }
    lowest.setPopulation(temp);

    for(int i = 0; i < lowest.getPopulation().length; i++){
        System.out.print(temp[i]);
    }
    System.out.println();
    for(int i = 0; i < halfway; i++){
        temp2[i] = two[i];
    }

    for(int i = 0; i < lowest.getPopulation().length; i++){
        System.out.print(temp2[i]);
    }



}