Explain what the following code does (i.e. comment each line of the code) import

Question

Explain what the following code does (i.e. comment each line of the code)

import java.util.LinkedList;

public class Merge {

   public static void main(String[] args) {
      
       LinkedList<Integer> l1=new LinkedList<>();
       LinkedList<Integer> l2=new LinkedList<>();
       l1.add(3);
       l1.add(1);
       l1.add(6);
       l2.add(2);
       l2.add(8);
       l2.add(5);
       LinkedList<Integer> l3=Merge.merge(l1, l2);
      
   }
  
   public static LinkedList<Integer> merge(LinkedList<Integer> l1,LinkedList<Integer> l2)
   {
       LinkedList<Integer> l3=null;
      
       l3.addAll(l1);
       l3.addAll(l2);
       return l3;
   }
}

Explanation / Answer

//importing LinkedList class from util package
import java.util.LinkedList;

public class Merge {

public static void main(String[] args) {
// creating Generic LinkedList class of Integer type object(l1)
LinkedList<Integer> l1=new LinkedList<>();
// creating Generic LinkedList class of Integer type object(l2)
LinkedList<Integer> l2=new LinkedList<>();

l1.add(3); // adding item "3" to the LinkedList l1
l1.add(1); // adding item "1" to the LinkedList l1
l1.add(6); // adding item "6" to the LinkedList l1
l2.add(2); // adding item "2" to the LinkedList l2
l2.add(8); // adding item "8" to the LinkedList l2
l2.add(5); // adding item "5" to the LinkedList l2
// calling static method merge() which returns the LinkedList object
LinkedList<Integer> l3=Merge.merge(l1, l2);
  
}
// merge() method which takes input parameters as 2 linkedlist objects and returns linkedlist object
public static LinkedList<Integer> merge(LinkedList<Integer> l1,LinkedList<Integer> l2)
{
//creating linkedlist reference l3 and initializing it to null
LinkedList<Integer> l3=null;

l3.addAll(l1); // adding all the elements l1 object to l3
l3.addAll(l2); // adding all the elements l2 object to l3
return l3; // returning l3 object to calling method
}
}

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