IntToDoubleFunction 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 accepts a int-valued argument and produces an double-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 IntToDoubleFunction Interface by using different examples.
IntToDoubleFunction Interface in Java 8 with Examples...!!! Share on X
Look at IntToDoubleFunction Javadoc description below:
IntToDoubleFunction Interface contains following method:
applyAsDouble
This method performs operation on the given int-valued argument and return a double-valued result.
double applyAsDouble(int value);
Lets understand above mentioned method thorough below example:
Example: ‘applyAsDouble’ method
import java.util.function.IntToDoubleFunction;
public class IntToDoubleFunctionInterfaceJava8Example1 {
public static void main(String[] args) {
//1. Anonymous Implementation
IntToDoubleFunction anonymousObj = new IntToDoubleFunction() {
@Override
public double applyAsDouble(int value) {
return value * 10;
}
};
//2. Lambda Implementation
IntToDoubleFunction lambdaObj = d -> d * 10;
//1
System.out.println("Result: " + anonymousObj.applyAsDouble(10));
//2
System.out.println("Result: " + lambdaObj.applyAsDouble(10));
}
}
Output:
Result: 100.0 Result: 100.0
Java 8 IntToDoubleFunction 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.
IntToDoubleFunction Interface in Java 8 with Examples...!!! Share on X
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