Flash cards
Review the key moves
What is the main idea behind Java ArrayList remove() Method?
Lesson checks
Practice each idea before moving on
Short Mimo-style checks built from this lesson's code, terms, and sequence.
Which statement best captures the main point of this lesson?
Complete the missing token from the example code.
___ java.util.ArrayList;Put the learning moves in the order that makes the concept easiest to apply.
❮ 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");
cars.remove(0);
System.out.println(cars);
}
}Definition and Usage
The remove() method removes an item from the list, either by position or by value. If a position is specified then this method returns the removed item. If a value is specified then it returns true if the value was found and false otherwise.
If a value is specified and multiple elements in the list have the same value then only the first one is deleted.
If the list contains integers and you want to delete an integer based on its value you will need to pass an Integer object. See More Examples below for an example.
One of the following
public T remove(int
index )public boolean remove(Object
item )T refers to the data type of items in the list.
Parameter Values
| Parameter | Description |
|---|---|
| index | Required. The position of the item to be deleted. |
| item | Required. The value of the item to be deleted. |
Technical Details
| Returns: | If an object was passed as an argument then it returns true if the object was found in the list and false otherwise. If an index was passed then it returns the object which was removed. |
|---|---|
| Throws: | IndexOutOfBoundsException - If the index is less than zero, equal to the size of the list or greater than the size of the list. |