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How to implement DoubleToIntFunction using lambda expression in Java?
DoubleToIntFunction is a functional interface defined in java.util.function package introduced in Java 8 version. This functional interface accepts a double-valued argument and produces an int-valued result. DoubleToIntFunction interface can be used as an assignment target for a lambda expression or method reference. It contains only one abstract method: applyAsInt().
Syntax
@FunctionalInterface interface DoubleToIntFunction { int applyAsInt(double value) }
Example
import java.util.function.DoubleToIntFunction; public class DoubleToIntFunctionTest { public static void main(String args[]) { DoubleToIntFunction test = doubleVal -> { // lambda expression int intVal = (int) doubleVal; return intVal; }; double input = 50.99; System.out.println("input: " + input); int result = test.applyAsInt(input); System.out.println("Result: " + result); } }
Output
input: 50.99 Result: 50
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