The Long.longValue()
method in Java is used to convert a Long
object to a long
primitive.
Table of Contents
- Introduction
longValue()
Method Syntax- Examples
- Converting a
Long
tolong
- Performing Arithmetic Operations
- Handling
null
Values
- Converting a
- Real-World Use Case
- Conclusion
Introduction
The Long.longValue()
method is an instance method in the Long
class in Java. It converts a Long
object to a long
primitive. This method is useful when you need to work with long
primitives instead of Long
objects, for example, in performance-critical applications or when interacting with APIs that require primitive types.
longValue()() Method Syntax
The syntax for the Long.longValue()
method is as follows:
public long longValue()
The method returns:
- The
long
value represented by thisLong
object.
Examples
Converting a Long
to long
The longValue()
method can be used to convert a Long
object to a long
primitive.
Example
public class LongToLongExample {
public static void main(String[] args) {
Long longObject = 123456789L;
long longValue = longObject.longValue();
System.out.println("Long value of 123456789L: " + longValue);
}
}
Output:
Long value of 123456789L: 123456789
In this example, the Long
object 123456789L
is converted to the long
primitive 123456789
.
Performing Arithmetic Operations
You can use the longValue()
method to extract the long
primitive from a Long
object and perform arithmetic operations.
Example
public class ArithmeticOperationsExample {
public static void main(String[] args) {
Long longObject1 = 500L;
Long longObject2 = 200L;
long sum = longObject1.longValue() + longObject2.longValue();
long difference = longObject1.longValue() - longObject2.longValue();
long product = longObject1.longValue() * longObject2.longValue();
long quotient = longObject1.longValue() / longObject2.longValue();
System.out.println("Sum: " + sum);
System.out.println("Difference: " + difference);
System.out.println("Product: " + product);
System.out.println("Quotient: " + quotient);
}
}
Output:
Sum: 700
Difference: 300
Product: 100000
Quotient: 2
In this example, the Long
objects 500L
and 200L
are converted to long
primitives, and arithmetic operations are performed on them.
Handling null
Values
When dealing with Long
objects, it’s important to handle null
values to avoid NullPointerException
.
Example
public class NullHandlingExample {
public static void main(String[] args) {
Long longObject = null;
if (longObject != null) {
long longValue = longObject.longValue();
System.out.println("Long value: " + longValue);
} else {
System.out.println("The Long object is null.");
}
}
}
Output:
The Long object is null.
In this example, the code checks if the Long
object is null
before attempting to convert it to a long
primitive.
Real-World Use Case
Converting User Input
In a real-world application, you might need to convert user input, which is often in the form of Long
objects, to long
primitives for calculations or storage.
Example
import java.util.Scanner;
public class UserInputExample {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.println("Enter a long number: ");
Long longObject = scanner.nextLong();
long longValue = longObject.longValue();
long result = longValue * 2;
System.out.println("The result of doubling the input is: " + result);
scanner.close();
}
}
Output (example input 123456789):
Enter a long number:
The result of doubling the input is: 246913578
In this example, the user input is read as a Long
object and then converted to a long
primitive for a calculation.
Conclusion
The Long.longValue()
method in Java is a straightforward way to convert Long
objects to long
primitives. By understanding how to use this method, you can efficiently handle tasks that involve converting Long
objects to long
primitives in your Java applications. Whether you are performing arithmetic operations, handling user input, or avoiding null
values, the longValue()
method provides a reliable solution for these tasks.