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How to implement DoubleBinaryOperator using lambda and method reference in Java?
DoubleBinaryOperator is a functional interface defined in java.util.function package. It accepts two parameters of type double as input and produces another double value as a result. DoubleBinaryOperator interface can be used as an assignment target for a lambda expression or method reference and has only one abstract method applyAsDouble().
Syntax
@FunctionalInterface
public interface DoubleBinaryOperator {
double applyAsDouble(double left, double right);
}Example-1
import java.util.function.DoubleBinaryOperator;
public class DoubleBinaryOperatorTest {
public static void main(String args[]) {
// using lambda expression
DoubleBinaryOperator sum = (d1, d2) -> d1 + d2;
DoubleBinaryOperator mul = (d1, d2) -> d1 * d2;
DoubleBinaryOperator div = (d1, d2) -> d1 / d2;
DoubleBinaryOperator sub = (d1, d2) -> d1 - d2;
System.out.println("Sum = " + operate(sum, 15, 10));
System.out.println("Multiplication = " + operate(mul, 15, 10));
System.out.println("Division = " + operate(div, 15, 10));
System.out.println("Subtraction = " + operate(sub, 15, 10));
}
private static double operate(DoubleBinaryOperator operator, double d1, double d2) {
return operator.applyAsDouble(d1, d2);
}
}Output
Sum = 25.0 Multiplication = 150.0 Division = 1.5 Subtraction = 5.0
Example-2
import java.util.function.DoubleBinaryOperator;
public class DoubleBinaryOperatorTest1 {
public static void main(String[] args) {
// Using Lambda Expression
DoubleBinaryOperator lamdaTest = (d1, d2) -> DoubleBinaryOperatorTest1.mutiply(d1, d2);
System.out.println(lamdaTest.applyAsDouble(7, 5));
// Using Method reference
DoubleBinaryOperator methodRefTest = DoubleBinaryOperatorTest1::mutiply;
System.out.println(methodRefTest.applyAsDouble(10, 5));
}
public static double mutiply(double d1, double d2) {
return d1 * d2;
}
}Output
35.0 50.0
Updated on: 13-Jul-2020
206 Views
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