Introduction
In Java, the DoubleConsumer
interface is a functional interface that represents an operation that accepts a single double
-valued argument and returns no result. It is part of the java.util.function
package and is commonly used for operations that process double
values, like logging or modifying data.
Table of Contents
- What is
DoubleConsumer
? - Methods and Syntax
- Examples of
DoubleConsumer
- Real-World Use Case
- Conclusion
1. What is DoubleConsumer?
DoubleConsumer
is a functional interface that performs an operation on a single double
input. It is often used in lambda expressions and method references for handling double
values.
2. Methods and Syntax
The main method in the DoubleConsumer
interface is:
void accept(double value)
: Performs this operation on the givendouble
argument.
Syntax
DoubleConsumer doubleConsumer = (double value) -> {
// operation on value
};
3. Examples of DoubleConsumer
Example 1: Printing a Double Value
import java.util.function.DoubleConsumer;
public class PrintDoubleExample {
public static void main(String[] args) {
// Define a DoubleConsumer that prints a double value
DoubleConsumer print = (value) -> System.out.println("Value: " + value);
print.accept(10.5);
}
}
Output:
Value: 10.5
Example 2: Multiplying and Displaying
import java.util.function.DoubleConsumer;
public class MultiplyExample {
public static void main(String[] args) {
// Define a DoubleConsumer that multiplies a double by 2 and prints the result
DoubleConsumer multiplyAndPrint = (value) -> System.out.println("Multiplied Value: " + (value * 2));
multiplyAndPrint.accept(3.5);
}
}
Output:
Multiplied Value: 7.0
4. Real-World Use Case: Processing Sensor Data
In data processing applications, DoubleConsumer
can be used to handle real-time sensor data, such as temperature readings.
import java.util.function.DoubleConsumer;
public class SensorDataProcessor {
public static void main(String[] args) {
// Define a DoubleConsumer to process temperature readings
DoubleConsumer processTemperature = (temperature) -> {
if (temperature > 30.0) {
System.out.println("High temperature alert: " + temperature);
} else {
System.out.println("Temperature is normal: " + temperature);
}
};
processTemperature.accept(32.5);
processTemperature.accept(28.0);
}
}
Output:
High temperature alert: 32.5
Temperature is normal: 28.0
Conclusion
The DoubleConsumer
interface is a versatile tool in Java for performing operations on double
values without returning a result. It simplifies handling tasks like logging, modifying data, or processing real-time information. Using DoubleConsumer
can lead to cleaner and more efficient code, especially in functional programming contexts.
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