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How to implement DoubleConsumer using lambda expression in Java?
DoubleConsumer is a functional interface from java.util.function package. This functional interface accepts a single double-valued argument as input and produces no output. This interface can be used as an assignment target for a lambda expression or method reference. DoubleConsumer contains one abstract method: accept() and one default method: andThen().
Syntax
@FunctionalInterface
public interface DoubleConsumer {
void accept(double value);
}Example-1
import java.util.function.DoubleConsumer;
public class DoubleConsumerLambdaTest1 {
public static void main(String args[]) {
DoubleConsumer increment = doubleVal -> { // lambda expression
System.out.println("Incrementing " + doubleVal + " by one");
System.out.println("Current Value : "+ (doubleVal+1));
};
DoubleConsumer decrement = doubleVal -> { // lambda expression
System.out.println("Decrementing " + doubleVal + " by one");
System.out.println("Current Value : " + (doubleVal-1));
};
DoubleConsumer result = increment.andThen(decrement);
result.accept(777);
}
}Output
Incrementing 777.0 by one Current Value : 778.0 Decrementing 777.0 by one Current Value : 776.0
Example-2
import java.util.Arrays;
import java.util.function.DoubleConsumer;
public class DoubleConsumerLambdaTest2 {
public static void main(String[] args) {
double[] numbers = {4.7d, 7d, 8.2d, 6.8d, 10.5d, 3.2d};
DoubleConsumer dconsumer = d -> System.out.print(d + " "); // lambda expression
Arrays.stream(numbers).forEach(dconsumer);
}
}Output
4.7 7.0 8.2 6.8 10.5 3.2
Updated on: 14-Jul-2020
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