ToLongBiFunction Interface is a part of the java.util.function package which is introduced in Java 8. It is an in-built Functional Interface. This function expect two arguments as an input and produces a long-valued result. As it is a functional interface, it can be used assignment target for lambda expression or method reference. In this post, we are going to see several implementations of ToLongBiFunction Interface by using different examples.
ToLongBiFunction Interface in Java 8 with Examples...!!! Share on X
Look at ToLongBiFunction Javadoc description below:
ToLongBiFunction Interface contains below method:
applyAsLong
Let’s discuss this method:
applyAsLong
This method performs operation on the given arguments and return the Long-valued result.
Long applyAsLong(T t, U u);
Let’s understand above mentioned method through below example:
Example. ‘applyAsLong’ method
import java.util.function.ToLongBiFunction;
public class ToLongBiFunctionInterfaceJava8Example {
public static void main(String[] args) {
System.out.println("ToLongBiFunction Interface - 'applyAsLong' example \n");
//1. anonymous implementation
ToLongBiFunction <String, Integer> anonymousObj = new ToLongBiFunction <String, Integer> () {
@Override
public long applyAsLong(String t, Integer u) {
return Long.parseLong(t) + u;
}
};
//2. lambda implementation
ToLongBiFunction <String, Integer> lambdaObj = (t, u) -> Long.parseLong(t) + u;
//1
System.out.println("Sum of 5 and 8 is: " + anonymousObj.applyAsLong("5", 8));
//2
System.out.println("Sum of 5 and 8 is: " + lambdaObj.applyAsLong("5", 8));
}
}
Output:
ToLongBiFunction Interface - 'applyAsLong' example Sum of 5 and 8 is: 13 Sum of 5 and 8 is: 13
Java 8 ToLongBiFunction Interface is an absolute useful addition as part of ‘Functional Interfaces’ and can serve variety of purposes. It is quite powerful as it can be used as a higher order functions through lambda functions and above examples could help you to get better idea on how to implement it.
ToLongBiFunction Interface in Java 8 with Examples...!!! Share on X
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