NumberFilterTool.java

package exp3;

import java.util.function.Function;

public class NumberFilterTool {

    public static void main(String[] args) {
        int[] numbers = NumberGenerator.generate(20);
        Function<Integer, Boolean> isEven = num -> num % 2 == 0;
        Function<Integer, Boolean> isGreaterThan10 = num -> num > 10;
        Function<Integer, Boolean> modBy3 = num -> num % 3 == 0;
        System.out.print("[+] Generated numbers: ");
        for (int num : numbers) {
            System.out.print(num + " ");
        }
        System.out.println();
        System.out.print("[*] Filtering even numbers: ");
        ArrayUtil.printFiltered(numbers, num -> isEven.apply(num));
        System.out.print("[*] Filtering numbers greater than 10: ");
        ArrayUtil.printFiltered(numbers, num -> isGreaterThan10.apply(num));
        System.out.print("[*] Filtering numbers divisible by 3: ");
        ArrayUtil.printFiltered(numbers, num -> modBy3.apply(num));
    }
}

interface NumberFilter {

    boolean test(int num);
}

class ArrayUtil {

    public static void printFiltered(int[] arr, NumberFilter filter) {
        for (int num : arr) {
            if (filter.test(num)) {
                System.out.print(num + " ");
            }
        }
        System.out.println();
    }
}

class NumberGenerator {

    public static int[] generate(int count) {
        int[] arr = new int[count];
        for (int i = 0; i < count; i++) {
            arr[i] = (int) (Math.random() * 100);
            for (int j = 0; j < i; j++) {
                if (arr[i] == arr[j]) {
                    i--;
                    break;
                }
            }
        }
        return arr;
    }
}