7.2 ArrayList Methods

• The `get(index)` method modifies the `ArrayList`.

  False
• The `size()` method returns the number of elements in an `ArrayList`.


  True
• Arrange the following steps to add an element to the end of an `ArrayList` using `add(element)`:

  1️⃣ Specify the `ArrayList` name

  2️⃣ Call the `add(element)` method

  3️⃣ Pass the element to be added
• What is the primary function of the `get(index)` method in an `ArrayList`?

  Retrieves element at index
• The `remove(index)` method shifts subsequent elements to the left.


  True
• Match the `ArrayList` method with its description:

  `remove(element)` ↔️ Removes the first occurrence of the specified element

  `remove(index)` ↔️ Removes the element at the specified index

  `add(element)` ↔️ Adds an element to the end of the list

  `get(index)` ↔️ Retrieves the element at the specified index
• What does the `add(element)` method do to an `ArrayList`?

  Adds an element to the end
• What is the purpose of the `remove(index)` method in an `ArrayList`?

  Removes the element at index
• Which method checks if an `ArrayList` contains a specific element?

  contains(element)
• What is the key difference between `add(element)` and `add(index, element)` in an `ArrayList`?

  `add(index, element)` inserts at index
• The `get(index)` method does not modify the `ArrayList`, it only retrieves the element at the specified index
• The `remove(index)` method is used to remove the element at the specified index
• The `add(element)` method appends the specified element to the end of the list
• The `set(index, element)` method replaces the element at the specified index
• The `isEmpty()` method in `ArrayList` returns true if the list is empty.
• The `set(index, element)` method in `ArrayList` replaces the existing element at a specified index.
• The `isEmpty()` method in `ArrayList` returns `true` if the list is empty
• What does the `contains(element)` method in `ArrayList` check?

  Existence of an element
• What does the `indexOf()` method in `ArrayList` return if the element is not found?

  -1
• The `lastIndexOf(element)` method returns -1 if the specified element is not found in the `ArrayList`.


  True
• In the example code, `groceryList.lastIndexOf("Apples")` returns the index 2
• The `add(index, element)` method inserts an element at a specified index
• The `set(index, element)` method replaces the element at a specified index
• The `indexOf(element)` method returns the first index of the specified element
• The `add(index, element)` method can increase the size of the `ArrayList`.


  True
• Arrange the following steps to retrieve an element from an `ArrayList` using `get(index)`:

  1️⃣ Specify the `ArrayList` name

  2️⃣ Call the `get(index)` method

  3️⃣ Pass the index of the element to retrieve
• The `remove(element)` method removes the first occurrence of a specified element from an `ArrayList` and shifts subsequent elements to the left.


  True
• The `add(index, element)` method inserts an element at a specified index, shifting subsequent elements to the right.


  True
• The `size()` method returns the number of elements in an `ArrayList`.


  True
• The `add(index, element)` method inserts an element at a specific index in the `ArrayList`.
• The `size()` method in `ArrayList` returns the number of elements currently stored in the list.


  True
• What is the purpose of the `isEmpty()` method in `ArrayList` when used with other methods like `add()` and `get()`?

  Robust and defensive code
• The `contains(element)` method checks if the specified element exists in the `ArrayList` using the syntax `list.contains(element);`
• The `indexOf()` method returns an integer representing the index
• The `lastIndexOf(element)` method returns the index of the last occurrence
• Match the `ArrayList` method with its primary purpose:

  `get(index)` ↔️ Retrieves an element

  `remove(element)` ↔️ Removes the first occurrence of an element

  `add(index, element)` ↔️ Inserts an element at a specified index

  `add(element)` ↔️ Adds an element to the end
• The `isEmpty()` method in `ArrayList` returns `true` if the list is empty
• The `remove(element)` method removes the first occurrence of a specified element from the `ArrayList`.

  True
• Using `isEmpty()` with other `ArrayList` methods ensures more robust and defensive code.
• The `isEmpty()` method returns `false` if the `ArrayList` contains one or more elements.


  True