Flash cards
Review the key moves
1/4
Core idea
What is the main idea behind Java ArrayList add() Method?
Lesson checks
Practice each idea before moving on
Short Mimo-style checks built from this lesson's code, terms, and sequence.
1Quick choice
Which statement best captures the main point of this lesson?
2Fill blank
Complete the missing token from the example code.
___ java.util.ArrayList;3Order
Put the learning moves in the order that makes the concept easiest to apply.
The add() method adds an item to the list.
Definition and Usage
Java ArrayList add() Method
❮ ArrayList Methods
Example
import java.util.ArrayList;
public class Main {
public static void main(String[] args) {
ArrayList<String> cars = new ArrayList<String>();
cars.add("Volvo");
cars.add("BMW");
cars.add("Ford");
cars.add("Mazda");
System.out.println(cars);
}
}Definition and Usage
The add() method adds an item to the list.
If an index is provided then the new item will be placed at the specified index, pushing all of the following elements in the list ahead by one.
If an index is not provided then the new item will be placed at the end of the list.
One of the following
public boolean add(T
item )public void add(int
index , T
item )T refers to the data type of items in the list.
Parameter Values
| Parameter | Description |
|---|---|
| index | Optional. The position in the list at which to add the item. |
| item | Required. The item to be added to the list. |
Technical Details
| Returns: | Nothing if an index is specified. When an index is not specified it returns true if the list changed and false if the list did not change. |
|---|---|
| Throws: | IndexOutOfBoundsException - If the index is less than zero or greater than the size of the list. |