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Write a method `static List concatenate(List l1, List l2)`.

`concatenate` should return a new list containing all the elements of `l1` followed by all the elements of `l2`, in the order they appeared. Your code must not modify `l1` or `l2`.

For example, with an input of `l1 = [1, 2, 5]` and `l2 = [2, 4, 1]`, it should return the list `[1, 2, 5, 2, 4, 1]`.

Answer :

Final answer:

The question asks for a method to concatenate two lists without modifying the original lists. This can be achieved in Java by creating a new ArrayList initialized with the first list, and then using the addAll method to add all elements of the second list. The result is a new list that contains all elements of the first and second lists, in their original order.

Explanation:

The concatenate method is a function that will take two input lists, l1 and l2, and return a new list that contains all elements of l1 followed by all elements of l2, all in their original order. The important detail here is that it does not modify the original lists l1 and l2.

Here is the method in Java:

import java.util.ArrayList;
import java.util.List;
public class Test {
 public static List concatenate(List l1, List l2) {
List newList = new ArrayList<>(l1);
newList.addAll(l2);
return newList;
 }
}In this method, we create a new ArrayList, newList, and initialize it with the elements of l1 using the constructor. Then, we use the addAll method of the List interface to add all the elements of l2 to the end of newList. This returns a new List that is a concatenation of l1 and l2, without modifying the original lists.

Learn more about Concatenation of Lists here:

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