Flash cards
Review the key moves
1/4
Core idea
What is the main idea behind Java ArrayList indexOf() 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 indexOf() method returns the position of the first occurrence of a value in the list.
Definition and Usage
Java ArrayList indexOf() 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.indexOf("Ford"));
}
}Definition and Usage
The indexOf() method returns the position of the first occurrence of a value in the list. If the item is not found in the list then it returns -1.
Syntax
public int indexOf(Object
item )Parameter Values
| Parameter | Description |
|---|---|
| item | Required. The item to search for in the list. |
Technical Details
| Returns: | The position of the first occurrence of the item in the list, or -1 if the item is not found. |
|---|