Writing Methods

AP Computer Science A· difficulty 4/5

public static void scale(int[] arr, int k) {
  for (int i = 0; i < arr.length; i++) {
    arr[i] *= k;
  }
}
public static void main(String[] args) {
  int[] a = {1, 2, 3};
  scale(a, 3);
  System.out.println(a[0]+" "+a[1]+" "+a[2]);
}

What is printed?

A
$Compilation error$
B
$0 0 0$
C
$1 2 3$
D
$3 6 9$
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Explanation

The method modifies the underlying array via index. Because array references point to the same object, changes are visible to the caller: 1 <em> 3, 2 </em> 3, 3*3.

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