The Integer.longValue()
method in Java is used to convert an Integer
object to a long
primitive.
Table of Contents
- Introduction
longValue()
Method Syntax- Examples
- Converting an
Integer
tolong
- Performing Arithmetic Operations
- Handling
null
Values
- Converting an
- Real-World Use Case
- Conclusion
Introduction
The Integer.longValue()
method is an instance method in the Integer
class in Java. It converts an Integer
object to a long
primitive. This method is useful when you need to perform operations that require long
primitives on Integer
objects.
longValue()() Method Syntax
The syntax for the Integer.longValue()
method is as follows:
public long longValue()
The method returns:
- The
long
value represented by thisInteger
object.
Examples
Converting an Integer
to long
The longValue()
method can be used to convert an Integer
object to a long
primitive.
Example
public class IntegerToLongExample {
public static void main(String[] args) {
Integer integerObject = 123;
long longValue = integerObject.longValue();
System.out.println("Long value of 123: " + longValue);
}
}
Output:
Long value of 123: 123
In this example, the Integer
object 123
is converted to the long
primitive 123
.
Performing Arithmetic Operations
You can use the longValue()
method to extract the long
primitive from an Integer
object and perform arithmetic operations.
Example
public class ArithmeticOperationsExample {
public static void main(String[] args) {
Integer integerObject1 = 50;
Integer integerObject2 = 25;
long sum = integerObject1.longValue() + integerObject2.longValue();
long difference = integerObject1.longValue() - integerObject2.longValue();
long product = integerObject1.longValue() * integerObject2.longValue();
long quotient = integerObject1.longValue() / integerObject2.longValue();
System.out.println("Sum: " + sum);
System.out.println("Difference: " + difference);
System.out.println("Product: " + product);
System.out.println("Quotient: " + quotient);
}
}
Output:
Sum: 75
Difference: 25
Product: 1250
Quotient: 2
In this example, the Integer
objects 50
and 25
are converted to long
primitives, and arithmetic operations are performed on them.
Handling null
Values
When dealing with Integer
objects, it’s important to handle null
values to avoid NullPointerException
.
Example
public class NullHandlingExample {
public static void main(String[] args) {
Integer integerObject = null;
if (integerObject != null) {
long longValue = integerObject.longValue();
System.out.println("Long value: " + longValue);
} else {
System.out.println("The Integer object is null.");
}
}
}
Output:
The Integer object is null.
In this example, the code checks if the Integer
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 Integer
objects, to long
primitives for calculations that require the long
type.
Example
import java.util.Scanner;
public class UserInputExample {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.println("Enter an integer: ");
Integer integerObject = scanner.nextInt();
long longValue = integerObject.longValue();
long result = longValue * 2;
System.out.println("The result of doubling the input is: " + result);
scanner.close();
}
}
Output (example input 123):
Enter an integer:
The result of doubling the input is: 246
In this example, the user input is read as an Integer
object and then converted to a long
primitive for a calculation.
Conclusion
The Integer.longValue()
method in Java is a straightforward way to convert Integer
objects to long
primitives. By understanding how to use this method, you can efficiently handle tasks that involve converting Integer
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.