How to check whether an array is null / empty in java?

In Java, you can check whether an array is null or empty using conditional statements. Here's how you can do it:

Check for Null:
To check if an array is null, you can simply use the equality operator (==) to compare the array reference to null. If it's equal to null, it means the array is null.
```
int[] array = null; if (array == null) { System.out.println("Array is null"); } else { System.out.println("Array is not null"); } 
```

Check for Empty:

To check if an array is empty, you need to examine its length. An array is considered empty if its length is 0.

int[] array = new int[0]; if (array.length == 0) { System.out.println("Array is empty"); } else { System.out.println("Array is not empty"); }

You can also check for an empty array on an existing array by using the length property:

int[] array = {1, 2, 3}; if (array.length == 0) { System.out.println("Array is empty"); } else { System.out.println("Array is not empty"); }

In summary, you can check whether an array is null by comparing it to null and whether it's empty by examining its length property.