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How to implement LongUnaryOperator using lambda in Java?
LongUnaryOperator is a functional interface from java.util.function package. This functional interface accepts a single long-valued operand and produces a long-valued result. LongUnaryOperator interface can be used as an assignment target for lambda expression and method reference. It contains one abstract method: applyAsLong(), one static method: identity() and two default methods: andThen() and compose().
Syntax
@FunctionalInterface public interface LongUnaryOperator long applyAsLong(long operand); }
Example
import java.util.function.LongUnaryOperator;
public class LongUnaryOperatorTest {
public static void main(String args[]) {
LongUnaryOperator getSquare = longValue -> { // lambda
long result = longValue * longValue;
System.out.println("Getting square: " + result);
return result;
};
LongUnaryOperator getNextValue = longValue -> { // lambda
long result = longValue + 1;
System.out.println("Getting Next value: " + result);
return result;
};
LongUnaryOperator getSquareOfNext = getSquare.andThen(getNextValue);
LongUnaryOperator getNextOfSquare = getSquare.compose(getNextValue);
long input = 10L;
System.out.println("Input long value: " + input);
System.out.println();
long squareOfNext = getSquareOfNext.applyAsLong(input);
System.out.println("Square of next value: " + squareOfNext);
System.out.println();
long nextOfSquare = getNextOfSquare.applyAsLong(input);
System.out.println("Next to square of value: " + nextOfSquare);
}
}Output
Input long value: 10 Getting square: 100 Getting Next value: 101 Square of next value: 101 Getting Next value: 11 Getting square: 121 Next to square of value: 121
Updated on: 14-Jul-2020
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