Chapter 8: Problem 20

Write a statement that creates an ArrayList object and assigns its address to a variable named lizards. The ArrayList should be able to store String objects only.

Short Answer

Expert verified

Answer: To create an ArrayList that can store only String objects and assign its address to a variable named "lizards", follow these steps: 1. Import the ArrayList class from the java.util package using "import java.util.ArrayList;". 2. Declare an ArrayList variable named "lizards" by writing "ArrayList lizards;". 3. Create an ArrayList object and assign its address to the "lizards" variable using "lizards = new ArrayList();".

Step by step solution

Import the ArrayList class

To work with ArrayList in Java, we need to import the ArrayList class from the java.util package. To do this, add the following import statement at the beginning of your code: ```java import java.util.ArrayList; ```

Declare an ArrayList variable

Next, we will declare a variable named "lizards" of type ArrayList. This informs the program that the variable "lizards" should store an ArrayList object that can only hold String objects. Add the following code line in your code: ```java ArrayList lizards; ```

Create an ArrayList object and assign its address to the lizards variable

In this step, we will create an ArrayList object that can store String objects and assign its address to the "lizards" variable. To create the ArrayList object, we use the "new" keyword followed by "ArrayList()". Add the following code: ```java lizards = new ArrayList(); ``` Now you have successfully created an ArrayList object that stores String objects only and assigned its address to a variable named "lizards". The complete code looks like this: ```java import java.util.ArrayList; public class LizardsList { public static void main(String[] args) { ArrayList lizards; lizards = new ArrayList(); } } ```

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Write a statement that creates an ArrayList object and assigns its address to a variable named lizards. The ArrayList should be able to store String objects only.

Short Answer

Step by step solution

Import the ArrayList class

Declare an ArrayList variable

Create an ArrayList object and assign its address to the lizards variable

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