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How to implement IntBinaryOperator using lambda expression in Java?
IntBinaryOperator is a functional interface in Java 8 from java.util.function package. This interface expects two parameters of type int as input and produces an int type result. IntBinaryOperator can be used as an assignment target for a lambda expression or method reference. It contains only one abstract method: applyAsInt().
Syntax
@FunctionalInterface
public interface IntBinaryOperator {
int applyAsInt(int left, int right)
}Example
import java.util.function.*;
public class IntBinaryOperatorTest {
public static void main(String[] args) {
IntBinaryOperator test1 = (a, b) -> a + b; // lambda expression
System.out.println("Addition of two parameters: " + test1.applyAsInt(10, 20));
IntFunction test2 = new IntFunction() {
@Override
public IntBinaryOperator apply(int value) {
return new IntBinaryOperator() {
@Override
public int applyAsInt(int left, int right) {
return value * left * right;
}
};
}
};
System.out.println("Multiplication of three parameters: " + test2.apply(10).applyAsInt(20, 30));
}
}Output
Addition of two parameters: 30 Multiplication of three parameters: 6000
Updated on: 14-Jul-2020
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