Chapter 7: Problem 29

How do you insert an item at a specific location in an Array list object?

Short Answer

Expert verified

Answer: To insert an element at a specific location in an ArrayList, we can use the add method with two parameters: the index where the element needs to be inserted and the value. For example, to insert a value "B" between "A" and "C" in our list, we use: list.add(1, "B");.

Step by step solution

Understand the concept of ArrayList

An ArrayList is a resizable array, which can be found in the java.util package. It is a dynamic array that can grow and shrink in size as elements are added or removed. It also allows the storage of a collection of objects, where each object has an index position called an index, starting from 0.

Initialize the ArrayList

First, we need to import the ArrayList class from the java.util package and create an ArrayList object. To create an ArrayList object, use the following syntax: ```java import java.util.ArrayList; ArrayList list = new ArrayList(); ```

Add elements to the existing ArrayList

To add elements to the existing ArrayList, we use the add method. By default, elements will be added to the end of the list. Here's an example: ```java list.add("A"); list.add("C"); list.add("D"); ```

Insert an element at a specific index

To insert an element at a specific location, we use the add method with two parameters: the index and the value. For example, to insert a value "B" between "A" and "C" in our list, we use: ```java list.add(1, "B"); // Adds "B" at index 1 ``` After this operation, the ArrayList will look like: ["A", "B", "C", "D"]

Display the modified ArrayList

To display this new ArrayList, we can use a loop to iterate through the elements and output their values: ```java for (String element : list) { System.out.println(element); } ``` The output will be: ``` A B C D ```

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How do you insert an item at a specific location in an Array list object?

Short Answer

Step by step solution

Understand the concept of ArrayList

Initialize the ArrayList

Add elements to the existing ArrayList

Insert an element at a specific index

Display the modified ArrayList

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