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How to implement LongConsumer using lambda in Java?
LongConsumer is a in-built functional interface from java.util.function package. This interface can accept a single long-valued argument as input and doesn't produce any output. It can also be used as the assignment target for a lambda expression or method reference and contains one abstract method: accept() and one default method: andThen().
Syntax
@FunctionalInterface public interface LongConsumer
Example-1
import java.util.function.LongConsumer;
public class LongConsumerLambdaTest {
public static void main(String[] args) {
LongConsumer displayNextVal = l-> { // lambda expression
System.out.println("Display the next value to input : "+l);
System.out.println(l+1);
};
LongConsumer displayPrevVal = l-> { // lambda expression
System.out.println("Display the previous value to input : "+l);
System.out.println(l-1);
};
LongConsumer displayPrevAndNextVal = displayNextVal.andThen(displayPrevVal);
displayPrevAndNextVal.accept(1000);
}
}Output
Display the next value to input : 1000 1001 Display the previous value to input : 1000 999
Example-2
import java.util.Arrays;
import java.util.function.LongConsumer;
public class LongConsumerTest {
public static void main(String[] args) {
long[] numbers = {13l, 3l, 6l, 1l, 8l};
LongConsumer longCon = l -> System.out.print(l + " ");
Arrays.stream(numbers).forEach(longCon);
}
}Output
13 3 6 1 8
Updated on: 13-Jul-2020
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