ToIntFunction 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 an argument as an input and produces a int-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 ToIntFunction Interface by using different examples.
ToIntFunction Interface in Java 8 with Examples...!!! Share on X
Look at ToIntFunction Javadoc description below:
ToIntFunction Interface contains below method:
applyAsInt
Let’s discuss this method:
applyAsInt
This method performs operation on the given argument and return the int-valued result.
int applyAsInt(T value);
Lets understand above mentioned method through below example:
Example. ‘applyAsInt’ method
package org.personal.samples;
import java.util.function.ToIntFunction;
public class ToIntFunctionInterfaceJava8Example {
public static void main(String[] args) {
System.out.println("ToIntFunction Interface - 'applyAsInt' example \n");
//1. anonymous implementation
ToIntFunction <Integer> anonymousObj = new ToIntFunction <Integer> () {
@Override
public int applyAsInt(Integer value) {
return value * 25;
}
};
//2. lambda implementation
ToIntFunction <Integer> lambdaObj = value -> value * 25;
//1
System.out.println("Result : " + anonymousObj.applyAsInt(5));
//2
System.out.println("Result : " + lambdaObj.applyAsInt(5));
}
}
Output:
ToIntFunction Interface - 'applyAsInt' example Result : 125 Result : 125
Java 8 ToIntFunction 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.
ToIntFunction Interface in Java 8 with Examples...!!! Share on X
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