CSC1110 - ArrayLists

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.title[
      # ArrayList
    ]

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    # Wrapping an Array in a Class

* Give behaviors to an array
    --

* Simplify managing lists of data
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* Hide subscript operator behind methods

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    # Declaring and Instantiating `ArrayList`s

* Make use of a generic type for flexibility
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* Specify type to be stored in the list as a generic: `ArrayList<String> words;`
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* Generic type must be a reference type (cannot be a primitive)
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* Instantiate ArrayList similar to other objects: `words = new ArrayList<>();`

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    # Popular Methods

* `size()`/`isEmpty()`/`clear()`
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* `get(int)`/`set(int, E)`
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* `add(E)`/`remove(Object)`/`contains(Object)`
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* `add(int, E)`/`remove(int)`/`indexOf(Object)`/`lastIndexOf(Object)`
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* `toArray()`

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# ArrayList Internals
    ``` java
    List<String> list = new ArrayList<>();
    list.add("dog");
    list.add(null);
    list.add("pig");
    list.add("cat");
    list.add("cow");
    list.add(null);
    ```