Question

1. Is it a compile error to specify more values than elements in an array?

2. A common application in an array is to exchange the contents of two elements such as when one sorts the array.   Would there be any advantage to exchanging addresses in array?   Why or why not?

3. There are two arrays one called A[50][30]  and one called B[50][30].  

The elements in each array are unique and different .  Explain by pseudo-code the ways one could employ to move elements from the array A to array B. How would one code a

Answer 1

1. No, it is a runtime error when you specify more values than elements in an array.

2. Yes, there is no major advantage since the number of steps remains the same and any change in the memory references would result in permanent loss of data.

3. The two ways are:

a)
public static void arrayCopy(int[][] A, int[][] B) {
    for (int i = 0; i < A.length; i++) {
        System.arraycopy(A[i], 0, B[i], 0, A[i].length);
    }
}

b)

public static int[][] cloneArray(int[][] A) {
    int length = A.length;
    int[][] B = new int[length][A[0].length];
    for (int i = 0; i < length; i++) {
        System.arraycopy(A[i], 0, B[i], 0, A[i].length);
    }
    return B;
}