This code defines a class `U6_L4_Activity_Two` with two static methods...

This code defines a class U6_L4_Activity_Two with two static methods (swap and allReverseSwap) that perform array manipulation tasks. Let's break down each method:

1. swap Method

public static void swap(int[] arr, int i, int j)

• Purpose: This method swaps the elements at indices i and j in the input array arr.
• Steps:
  1. Confirms that i and j are both non-negative (i.e., i >= 0 and j >= 0).
  2. Temporarily stores the values arr[i] and arr[j] in a temporary array named tempNum.
  3. Swaps the array values by assigning arr[i] = tempNum[1] and arr[j] = tempNum[0].
• Key Insights:
  • Uses a temporary array to hold the values being swapped.
  • Only executes if i and j are valid (non-negative).

2. allReverseSwap Method

public static void allReverseSwap(int[] arr)

• Purpose: This method reverses the input array arr, effectively swapping the values from the start to the end of the array.
• Steps:
  1. Creates a temporary array tempArr of the same length as arr.
  2. Copies elements from the input array arr into tempArr in reverse order. Specifically, tempArr[i] gets assigned the value of arr[(arr.length - 1) - i] for every i.
  3. Copies the reversed elements from tempArr back into arr.
• Key Insights:
  • The input array arr is modified in-place with reversed values.
  • It uses a temporary array to hold the reversed version of the input array.

Summary:

• swap: Swaps two elements in the array.
• allReverseSwap: Reverses the entire array by using a temporary array to store the reversed values before overwriting the original array.