Chapter 8: Problem 23

How do you retrieve a specific item from an ArrayList object?

Short Answer

Expert verified

Answer: To retrieve a specific item from an ArrayList, use the 'get()' method by providing the index of the desired item. For instance, if you have an ArrayList named 'myList' and want to retrieve the second item, use the following code snippet: ```java String item = myList.get(1); ``` In this example, '1' is the index of the second item, and 'item' is the variable storing the retrieved value.

Step by step solution

Create an ArrayList object

Create an ArrayList object with some elements. You can add elements using the 'add()' method of the ArrayList class. For example: ```java import java.util.ArrayList; public class Main { public static void main(String[] args) { ArrayList myList = new ArrayList(); myList.add("Apple"); myList.add("Banana"); myList.add("Cherry"); } } ```

Determine the index of the item you want to retrieve

In an ArrayList, items are stored with indexes starting from 0. So, if you want to retrieve the second item in the list, the index will be 1, not 2. In our example, to retrieve "Banana", we need to use the index 1.

Use the 'get()' method to retrieve the item

The 'get()' method is used to access the element at the specified index in the ArrayList. Here's the syntax: ```java list.get(index); ``` Replace 'list' with the name of your ArrayList object, and 'index' with the index of the item you want to retrieve.

Retrieve the item and store or print it

Using the 'get()' method, we can store the retrieved item into a variable or print it directly. In the following example, we retrieve the item at index 1 ("Banana") and print it: ```java import java.util.ArrayList; public class Main { public static void main(String[] args) { ArrayList myList = new ArrayList(); myList.add("Apple"); myList.add("Banana"); myList.add("Cherry"); String fruit = myList.get(1); System.out.println("The item at index 1 is: " + fruit); } } ``` Running this code would output: ``` The item at index 1 is: Banana ```

Unlock Step-by-Step Solutions & Ace Your Exams!

Full Textbook Solutions
Get detailed explanations and key concepts
Unlimited Al creation
Al flashcards, explanations, exams and more...
Ads-free access
To over 500 millions flashcards
Money-back guarantee
We refund you if you fail your exam.

Start your free trial

Over 30 million students worldwide already upgrade their learning with Vaia!

Recommended explanations on Computer Science Textbooks

View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

How do you retrieve a specific item from an ArrayList object?

Short Answer

Step by step solution

Create an ArrayList object

Determine the index of the item you want to retrieve

Use the 'get()' method to retrieve the item

Retrieve the item and store or print it

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Computer Science Textbooks

Algorithms in Computer Science

Big Data

Data Representation in Computer Science

Computer Organisation and Architecture

Theory of Computation

Game Design in Computer Science

Study anywhere. Anytime. Across all devices.