Unlimited argument function as @FunctionalInterface

UnlimitedArgumentFunction.java

package sample.function.infinite;

/**
 * It's possible too. Example of a 'unlimited argument' Function interface.
 * But it can cause Potential heap pollution due to varargs parameter element in @see {@link UnlimitedArgumentFunction#apply(Object...)} 
 * 
 * @author Andre Dias
 * @since 2017-08-12
 */
@FunctionalInterface
public interface UnlimitedArgumentFunction<F, R> {
	
	public R apply(F ... elements);
	
}

UnlimitedArgumentFunctionImpl.java

package sample.function.infinite;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

/**
 * Example of usage for @see {@link UnlimitedArgumentFunction}.
 * 
 * @author Andre Dias
 * @since 2017-08-12
 */
public class UnlimitedArgumentFunctionImpl implements UnlimitedArgumentFunction<Integer, Integer> {

	/**
	 * Just add elements (simple example).
	 * 
	 * @see sample.function.infinite.UnlimitedArgumentFunction#apply(java.lang.Object[])
	 */
	public Integer apply(final Integer... elements) {
		Integer result = 0;
		
		for (Integer current : elements) {
			result += current;
		}
		
		return result;
	}
	
	public static void main(String[] args) {
		List<Integer> fewElements = Arrays.asList(1, 2);
		List<Integer> someElements = Arrays.asList(1, 2, 3, 4, 5);
		List<Integer> bigElementList = new ArrayList<Integer>();
		
		for (int i = 0; i < 10000; i++) {
			bigElementList.add(i);
		}
		
		final UnlimitedArgumentFunction<Integer, Integer> mainFunction = new UnlimitedArgumentFunctionImpl();
		
		System.out.println(
				String.format("'Few Elements List' add result is: %s", 
						mainFunction.apply( (Integer[])fewElements.toArray() )))  ;
		
		System.out.println(
				String.format("'Some Elements List' add result is: %s", 
						mainFunction.apply( (Integer[])someElements.toArray() )))  ;
		
		System.out.println(
				String.format("'Big Element List' add result is: %s", 
						mainFunction.apply( Arrays.copyOf(bigElementList.toArray(new Integer[] {}), bigElementList.size()) )))  ;
		
	}
}