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How to implement IntUnaryOperator using lambda in Java?
IntUnaryOperator represents a functional interface that takes an int value and returns another int value. It is defined in java.util.function package and used as an assignment target for a lambda expression or method reference. It contains one abstract method: applyAsInt(), two default methods: compose(), andThen() and one static method: identity().
Syntax
@FunctionalInterface public interface IntUnaryOperator
Example
import java.util.function.IntUnaryOperator; public class IntUnaryOperatorLambdaTest1 { public static void main(String[] args) { IntUnaryOperator getSquare = intValue -> { // lambda expression int result = intValue * intValue; System.out.println("Getting square: "+ result); return result; }; IntUnaryOperator getNextInt = intValue -> { // lambda expression int result = intValue+1; System.out.println("Getting Next Int: "+ result); return result; }; IntUnaryOperator getSquareOfNext = getSquare.andThen(getNextInt); IntUnaryOperator getNextOfSquare = getSquare.compose(getNextInt); int input = 3; System.out.println("Input int value: "+ input); System.out.println(); int squareOfNext = getSquareOfNext.applyAsInt(input); System.out.println("Square of next int value: "+ squareOfNext); System.out.println(); int nextOfSquare = getNextOfSquare.applyAsInt(input); System.out.println("Next to square of int value: "+ nextOfSquare); } }
Output
Input int value : 3 Getting square : 9 Getting Next Int : 10 Square of next int value : 10 Getting Next Int : 4 Getting square : 16 Next to square of int value : 16
Example-2
import java.util.concurrent.ThreadLocalRandom; import java.util.function.IntUnaryOperator; public class IntUnaryOperatorLambdaTest2 { public static int getRandonInt(){ return ThreadLocalRandom.current().nextInt(1000, 4999); } public static void main(String[] args) { IntUnaryOperator getInput = IntUnaryOperator.identity(); int identityVal = getInput.applyAsInt(getRandonInt()); System.out.println("Value passed as argument: "+ identityVal); System.out.println("Value passed as argument: "+ getInput.applyAsInt(getRandonInt())); System.out.println("Value passed as argument: "+ getInput.applyAsInt(getRandonInt())); } }
Output
Value passed as argument: 3141 Value passed as argument: 2635 Value passed as argument: 1179
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