public int getLargest2(int[] nums)

Given an int[] array with 2 elements
return the largest value.

Create an int return variable called largest.
Assign it a default value, e.g. the first element.
Use an if statement to check if the other value is larger -
and if it is larger, change the value of largest to that value.

public int getLargest2(int[] nums) {
  int largest = nums[0];
  if (nums[1] > largest) {
    largest = nums[1];
  }
  return largest;
}

Note: Another way to check for the larger of two values is to use Math.max():

public int getLargest2(int[] nums) {
  int largest = Math.max( nums[0], nums[1] );
  return largest;
}