How do you convert an ArrayList to a LinkedList and vice versa?

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You can use the constructor of LinkedList that accepts a Collection, passing the ArrayList as an argument.

ArrayList<String> arrayList = new ArrayList<>();
arrayList.add("A");
arrayList.add("B");
// Convert ArrayList to LinkedList  

LinkedList<String> linkedList = new LinkedList<>(arrayList);

How to convert a LinkedList to an ArrayList:

Similarly, use the constructor of ArrayList that accepts a Collection, passing the LinkedList as an argument.

LinkedList<String> linkedList = new LinkedList<>();
linkedList.add("X");
linkedList.add("Y");
// Convert LinkedList to ArrayList  

ArrayList<String> arrayList = new ArrayList<>(linkedList);

Things to keep in mind:

1. The conversion is straightforward since both implement the List interface.

2. Be aware of performance impacts if you're switching between these structures frequently for large datasets.