Question

In Java:

• Write a method called copy, which is passed A[], which is an array of int, and an integer n. The method returns a new array consisting of the first n items in A[].
• Write a method called slice, which is passed A[], which is an array of int, an integer i and an integer j. The method returns a new array consisting of all of the items in A from A[i] to A[j] inclusive.

Answer 1

public static int[] copy(int[] arr, int n) {
    int[] result = new int[n];
    for (int i = 0; i < n; i++) {
        result[i] = arr[i];
    }
    return result;
}

public static int[] slice(int[] arr, int i, int j) {
    int[] result = new int[j-i+1];
    for (int k = 0; k < result.length; k++) {
        result[k] = arr[i+k];
    }
    return result;
}