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How to implement LongToIntFunction using lambda and method reference in Java?
LongToIntFunction is a functional interface from java.util.function package introduced in Java 8. This functional interface accepts a long-valued parameter as input and produces an int-valued result. LongToIntFunction interface can be used as an assignment target for a lambda expression or method reference. This interface contains only one abstract method: applyAsInt() and doesn't contain any default and abstract methods.
Syntax
@FunctionalInterface
interface LongToIntFunction {
int applyAsInt(long value);
}Example of Lambda Expression
import java.util.function.LongToIntFunction;
public class LongToIntLambdaTest {
public static void main(String args[]) {
LongToIntFunction getInt = longVal -> { // lambda expression
int intVal = (int)longVal;
return intVal;
};
long input = 757775L;
System.out.println("The input is: " + input);
int result = getInt.applyAsInt(input);
System.out.println("The result is: " + result);
}
}Output
The input is: 757775 The result is: 757775
Example of Method Reference
import java.util.function.LongToIntFunction;
public class LongToIntFunctionMethodRefTest {
public static void main(String[] args) {
LongToIntFunction result = LongToIntFunctionMethodRefTest::convertLongToInt; // method reference
System.out.println(result.applyAsInt(50));
System.out.println(result.applyAsInt(100));
}
static Integer convertLongToInt(long value) {
return (int) value / 10;
}
}Output
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Updated on: 15-Jul-2020
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