Задача с лямбда выражением

package ru.java.oop.lambda;
 
import java.util.Arrays;
import java.util.function.IntPredicate;
 
public class Sequence {
 
    public static int[] filter (int[] array, IntPredicate predicate) {
        int counter = 0;
        for (int i = 0; i < array.length; i++) {
            if (predicate.test(array[i]))
                array[counter++] = array[i];
        }
        int[] newArray = new int[counter];
        System.arraycopy(array, 0, newArray ,0, counter);
        return newArray;
    }
 
    public static void main(String[] args) {
        int[] array_first = new int[]{1, 2, 3, 4, 5};
        System.out.println(Arrays.toString(filter(array_first, Sequence::isEvenNumber)));
        int[] array_second = new int[]{1, 2, 3, 4, 5};
        System.out.println(Arrays.toString(filter(array_second, Sequence::isSumEvenNumber)));
    }
    public static boolean isEvenNumber(int number) {
        if (number % 2 == 0)
            return true;
        return false;
    }
    public static boolean isSumEvenNumber(int number) {
        int sum = 0;
        while (number > 0)
        {
            sum = sum + number % 10;
            number = number/ 10;
        }
        if(sum % 2 == 0)
            return true;
        return false;
    }
}

int[] array_first = new int[]{1, 2, 3, 4, 5};
System.out.println(Arrays.toString(filter(array_first, Sequence::isEvenNumber)));
int[] array_second = new int[]{1, 2, 3, 4, 5};
System.out.println(Arrays.toString(filter(array_second, Sequence::isSumEvenNumber)));

    public static int[] filter (int[] array, IntPredicate predicate) {
        int counter = 0;
        int[] newArray = new int[counter];
        for (int i = 0; i < array.length; i++) {
            if (predicate.test(array[i])) {
                newArray[counter++] = array[i];
            }
        }
        System.arraycopy(array, 0, newArray ,0, counter);
        return newArray;
    }

return Arrays.stream(array).filter(predicate).toArray();