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How to implement LongSupplier using lambda and method reference in Java?
LongSupplier is a built-in functional interface from java.util.function package. This interface doesn’t expect any input but produces a long-valued output. Since LongSupplier is a functional interface, it can be used as an assignment target for lambda expression and method reference and contains only one abstract method: getAsLong().
Syntax
@FunctionalInterface public interface LongSupplier { long getAsLong(); }
Example of Lambda Expression
import java.util.function.LongSupplier; public class LongSupplierLambdaTest { public static void main(String args[]) { LongSupplier supplier = () -> { // lambda expression return 75; }; long result = supplier.getAsLong(); System.out.println(result); } }
Output
75
Example of method reference
import java.util.function.LongSupplier; public class LongSupplierMethodRefTest { public static void main(String[] args) { LongSupplier supplier = LongSupplierMethodRefTest::getValue; // method reference double result = supplier.getAsLong(); System.out.println(result); } static long getValue() { return 50; } }
Output
50.0
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