Assume that the methods below (reverse and swap) are defined in the same class. Explain what is wrong and show all corrections that are needed.

/**

• * reverse: reverses the elements of an array of integers.

• * For example, if the array elements are 85, 99, 78, 100, then the array should be changed so

• * that its elements are 100, 78, 99, 85. *

• * @param a an array of integers

• * @param len the number of elements in the array */

  public void reverse(int[] a, int len) {

  for (int i = 0; i < len; i++) this.swap(a[i], a[len i]);

  }

  /**

• * swap: swaps (exchanges) two values. *

• * @param x the first value

• * @param y the second value */

  public void swap(int x, int y) {

  int temp; temp = x; x = y; y = temp;

}