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How to implement IntToDoubleFunction using lambda and method reference in Java?
IntToDoubleFunction is a functional interface from java.util.function package. This functional interface accepts an int-valued argument and produces a double-valued result. IntToDoubleFunction can be used as an assignment target for a lambda expression or method reference. It contains only one abstract method: applyAsDouble().
Syntax
@FunctionalInterface
interface IntToDoubleFunction {
double applyAsDouble(int value);
}Example of Lambda Expression
import java.util.function.IntToDoubleFunction;;
public class IntToDoubleLambdaTest {
public static void main(String[] args) {
IntToDoubleFunction getDouble = intVal -> { // lambda expression
double doubleVal = intVal;
return doubleVal;
};
int input = 25;
double result = getDouble.applyAsDouble(input);
System.out.println("The double value is: " + result);
input = 50;
System.out.println("The double value is: " + getDouble.applyAsDouble(input));
input = 75;
System.out.println("The double value is: " + getDouble.applyAsDouble(input));
}
}Output
The double value is: 25.0 The double value is: 50.0 The double value is: 75.0
Example of Method Reference
import java.util.function.IntToDoubleFunction;
public class IntToDoubleMethodRefTest {
public static void main(String[] args) {
IntToDoubleFunction result = IntToDoubleMethodRefTest::convertIntToDouble; // method reference
System.out.println(result.applyAsDouble(50));
System.out.println(result.applyAsDouble(100));
}
static Double convertIntToDouble(int value) {
return value / 10d;
}
}Output
5.0 10.0
Updated on: 14-Jul-2020
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