How to check if an int is a null

In Java, an int is a primitive data type and cannot be null. However, you can use the Integer class to wrap an int value and set it to null.

To check if an Integer is null, you can use the following code:

Integer number = null;
if (number == null) {
    // number is null
} else {
    // number is not null
}

Alternatively, you can use the Java Optional class to safely check for a null value:

Optional<Integer> optionalNumber = Optional.ofNullable(number);
if (optionalNumber.isPresent()) {
    // number is not null
    int value = optionalNumber.get();
} else {
    // number is null
}

Keep in mind that using the Optional class adds a layer of indirection and can affect the performance of your code. It is usually best to use Optional for variables that are likely to be null, and to use primitive data types (such as int) for variables that are not expected to be null.