How can I check whether an array is null / empty?

To check if an array is null in Java, you can use the == operator and compare the array to null. For example:

int[] arr = null;

if (arr == null) {
    System.out.println("Array is null");
}

To check if an array is empty, you can use the length field of the array. An array is considered empty if its length is 0. For example:

int[] arr = new int[0];

if (arr.length == 0) {
    System.out.println("Array is empty");
}

You can also use the isEmpty method of the java.util.Arrays class to check if an array is empty:

import java.util.Arrays;

int[] arr = new int[0];

if (Arrays.isEmpty(arr)) {
    System.out.println("Array is empty");
}

I hope this helps! Let me know if you have any questions.

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