TEST - Java merge list

main.java

import java.util.LinkedList;

public class main
{
    public static void main(String[] args)
    {
        // 1) Create the two integer list

        LinkedList<Integer> firstList = new LinkedList<>();
                firstList.add(1);
                firstList.add(2);
                firstList.add(3);
                firstList.add(5);
        LinkedList<Integer> secondList = new LinkedList<>();
                secondList.add(2); // Duplicate
                secondList.add(4);
                secondList.add(6);

        // 2) Parse the first one and check->clear the second one if the occurence exists in the other list

        firstList.forEach((temp) -> {
           int indexOf = secondList.indexOf(temp);
           if (indexOf != -1) {
            secondList.remove(indexOf);
           }
        });

        // 3) Merge

        LinkedList<Integer> mergedList = new LinkedList<>();
        mergedList.addAll(firstList);
        mergedList.addAll(secondList);

        // 4) Display result

        System.out.println("firstList : "+firstList);
        System.out.println("secondList : "+secondList);
        System.out.println("mergedList : "+mergedList);
    }
}