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How to implement IntToLongFunction using lambda and method reference in Java?
IntToLongFunction is a built-in functional interface from java.util.function package. This functional interface accepts an int-valued parameter and produces a long-valued result. IntToLongFunction interface can be used as an assignment target for a lambda expression or method reference. It contains only one abstract method: applyAsLong().
Syntax
@FunctionalInterface
interface IntToLongFunction {
long applyAsLong(int value);
}Example of Lambda Expression
import java.util.function.IntToLongFunction;
public class IntToLongFunctionLambdaTest {
public static void main(String args[]) {
IntToLongFunction getLong = intVal -> { // lambda expression
long longVal = intVal;
return longVal;
};
int input = 40;
long result = getLong.applyAsLong(input);
System.out.println("The long value is: " + result);
input = 75;
System.out.println("The long value is: " + getLong.applyAsLong(input));
input = 90;
System.out.println("The long value is: " + getLong.applyAsLong(input));
}
}Output
The long valus is: 40 The long valus is: 75 The long valus is: 90
Example of Method Reference
import java.util.function.IntToLongFunction;
public class IntToLongFunctionMethodRefTest {
public static void main(String args[]) {
IntToLongFunction result = IntToLongFunctionMethodRefTest::convertIntToLong; // method reference
System.out.println(result.applyAsLong(75));
System.out.println(result.applyAsLong(45));
}
static Long convertIntToLong(int value) {
return value / 10L;
}
}Output
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Updated on: 15-Jul-2020
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