help!! please comment your code

We have written the following method to check if an Integer is even. It works in most cases, but if x is null, it simply throws a non-descriptive NullPointerException. TASK: Update the following code such that, if x is null, the code will throw a new NullPointerException with the following message: "Cannot check Integer value null" Sample Input: 42 null Sample Output: true java.lang.NullPointerException: Cannot check Integer value null Write a program, test using stdin stdout Time limit: 8 seconds Memory limit: 256 MB 1 /** 2 * Check if an Integer is even 3 */ 4 public static boolean isEven(Integer x) { return x.intValue() % 2 == 0; 6} vo