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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

01

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.
02

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(); ```
03

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"); ```
04

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"]
05

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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Most popular questions from this chapter

A program uses a variable named array that references an array of integers. You do not know the number of clements in the array. Write a for loop that stores -1 in cach element of the array.

a) Write a statement that declares a string array initialized with the following strings: "Mercury", "Venus", "Earth", and "Mars". b) Write a loop that displays the contents of cach element in the array you declared in A. c) Write a loop that displays the first character of the strings stored in cach element of the array you declared in A. (Hint: Use the string class's charat method discussed in Chaprer \(2 .\)

Look at the following method header: public static vold mymethod (double[] array) Here is an array declaration: double[] numbers = new double [100] Write a statement that passes the numbers array to the myMethod method.

How do you remove an item from an ArrayList object?

What import statement must you include in your code in order to use the Array List class?
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