Java List of Lists: How to Work with Nested Arrays

If you are working with nested arrays in Java, it can be useful to use a List of Lists instead. This provides a more flexible and efficient way to work with data that has multiple levels of nesting.

├Źndice
  1. Creating a List of Lists
  2. Adding Elements to a List of Lists
  3. Accessing Elements in a List of Lists
  4. Iterating through a List of Lists

Creating a List of Lists

To create a List of Lists in Java, you can use the List interface and the ArrayList class. Here is an example:


List<List<String>> nestedList = new ArrayList<>();

This creates a List that contains other Lists, each of which contains String objects.

Adding Elements to a List of Lists

To add elements to a List of Lists, you can use the add() method. Here is an example:


nestedList.add(new ArrayList<>());
nestedList.get(0).add("element");

This creates a new List within the nestedList and adds the element "element" to it.

Accessing Elements in a List of Lists

To access elements in a List of Lists, you can use the get() method. Here is an example:


String element = nestedList.get(0).get(0);

This retrieves the element at index 0 of the first List within the nestedList.

Iterating through a List of Lists

To iterate through a List of Lists, you can use nested loops. Here is an example:


for (List<String> list : nestedList) {
    for (String element : list) {
        System.out.println(element);
    }
}

This prints out all the elements in the nestedList.

By using a List of Lists, you can simplify your code and make it more efficient when working with nested arrays in Java. It also provides a more flexible way to work with data that may have varying levels of nesting.

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