Computer scienceProgramming languagesJavaWorking with dataCollectionsCollection Implementations

ArrayList

Theory

Concat positive numbers

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Implement a method to concatenate all positive numbers of two input ArrayLists to a single resulting list.

At first, elements from the first ArrayList should go, and then the elements from the second ArrayList.

Sample Input 1: 

8 11 -2 -3 14 15
-1 33 12 -3 -5

Sample Output 1: 

8 11 14 15 33 12
Write a program in Java 17
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Scanner;
import java.util.stream.Collectors;

class ConcatPositiveNumbersProblem {

public static ArrayList<Integer> concatPositiveNumbers(ArrayList<Integer> l1, ArrayList<Integer> l2) {
return l1; // write your code here
}

/* Do not modify this method */
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);

ArrayList<Integer> list1 = readArrayList(scanner);
ArrayList<Integer> list2 = readArrayList(scanner);

ArrayList<Integer> result = concatPositiveNumbers(list1, list2);

result.forEach(n -> System.out.print(n + " "));
}

/* Do not modify this method */
private static ArrayList<Integer> readArrayList(Scanner scanner) {
return Arrays
.stream(scanner.nextLine().split("\\s+"))
.map(Integer::parseInt)
.collect(Collectors.toCollection(ArrayList::new));
}
}
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