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How to implement IntConsumer using lambda and method reference in Java?
IntConsumer interface is a functional interface from java.util.function package in Java 8. This interface accepts a single int-valued argument as input but doesn't produce any output. Since it is a functional interface, it can be used as an assignment target for a lambda expression or method reference. It contains one abstract method: accept() and one default method: andThen().
Syntax
@FunctionalInterface public interface IntConsumer { void accept(int value); }
Example of Lambda Expression
import java.util.function.IntConsumer; public class IntConsumerTest1 { public static void main(String[] args) { IntConsumer displayNextInt = i -> System.out.println("Next Int Value: " + (i+1)); // lambda IntConsumer displaySquare = i -> System.out.println("Int Square Value: " + (i*i)); // lambda IntConsumer displayBoth = displayNextInt.andThen(displaySquare); displayBoth.accept(25); } }
Output
Next Int Value: 26 Int Square Value: 625
Example of Method reference
import java.util.function.IntConsumer; public class IntConsumerTest2 { public static void main(String[] args) { IntConsumer consumer = IntConsumerTest2::print; // method reference consumer.accept(77); } static void print(int i) { System.out.println(i); } }
Output
77
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