The process can be visualized with the following flow:

graph TD
    A[Start] --> B[Declare Long variable]
    B --> C[Check for null]
    C -- Null --> D[Handle null case]
    C -- Not Null --> E[Process valid value]
    D --> F[Continue]
    E --> F
    F --> G[End]

Step 1: Declaring a Long Varible

Begin by declaring a variable of the wrapper type Long. This object can be initialized with a value or assigned a value from another part of your application. It can also intentionally be set to null to represent the absence of a value.

// Example of a Long variable
Long numericValue = 987654321L;

Step 2: Performing the Null Check

To safely use the numericValue object, you must verify that its not null. An if-else statement is the most common way to perform this validation. This ensures that you only attempt operations on a valid, non-null object.

if (numericValue != null) {
    // The object is valid; proceed with operations
    System.out.println("Value is present: " + numericValue);
} else {
    // The object is null; handle this situation
    System.out.println("Value is absent (null)");
}

Alternative: Using Optional for Modern Java

For Java 8 and later, you can use the Optional class for a more expressive and less error-prone approach to handling potential null values. Optional explicitly forces the developer to consider the case where a value might be absent.

import java.util.Optional;

// Wrapping the Long in an Optional
Optional<Long> optionalValue = Optional.ofNullable(numericValue);

// Checking and processing the value
optionalValue.ifPresentOrElse(
    value -> System.out.println("Found value: " + value),
    () -> System.out.println("Value was not found.")
);