Chapter 8: Problem 21

How do you add items to an ArrayList object?

Short Answer

Expert verified

Answer: To add items to an ArrayList object in Java, follow these steps: 1. Import the 'java.util.ArrayList' package. 2. Declare and initialize an ArrayList object, specifying the data type in angle brackets (e.g., ArrayList myList = new ArrayList();). 3. Use the 'add()' method to add elements to the ArrayList object (e.g., myList.add("element1");). 4. To display the elements, use a for-each loop to iterate through the ArrayList object and print each element (e.g., for (String element : myList) { System.out.println(element); }).

Step by step solution

Import java.util.ArrayList package

Import the 'java.util.ArrayList' package in the Java program to use ArrayList class. ```java import java.util.ArrayList; ```

Create an ArrayList object

Declare and initialize an ArrayList object. In this example, we will create an ArrayList of Strings. ```java ArrayList myList = new ArrayList(); ```

Add elements to the ArrayList object

Use the 'add()' method to add elements to the ArrayList object. ```java myList.add("element1"); myList.add("element2"); myList.add("element3"); ```

Display elements in the ArrayList object

Iterate through the ArrayList object using a for-each loop and display the elements. ```java for (String element : myList) { System.out.println(element); } ```

Complete Code:

Here's the complete code for the program that demonstrates adding items to an ArrayList object: ```java import java.util.ArrayList; public class Main { public static void main(String[] args) { // Step 2: Create an ArrayList object ArrayList myList = new ArrayList(); // Step 3: Add elements to the ArrayList object myList.add("element1"); myList.add("element2"); myList.add("element3"); // Step 4: Display elements in the ArrayList object for (String element : myList) { System.out.println(element); } } } ```

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How do you add items to an ArrayList object?

Short Answer

Step by step solution

Import java.util.ArrayList package

Create an ArrayList object

Add elements to the ArrayList object

Display elements in the ArrayList object

Complete Code:

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