Import the ArrayList and List classes from the java.util package to create a list of phone numbers and also import the HashSet and Set classes from the java.util package to create a set of unique prefixes. Create a class called PhoneNumberPrefix with a main method that will contain the code to find the unique prefixes. Create a List called phoneNumbers and use the add method to add several phone numbers to the list. List phoneNumbers = new ArrayList<>(); phoneNumbers.add("555-555-1234"); phoneNumbers.add("555-555-2345"); phoneNumbers.add("555-555-3456"); phoneNumbers.add("444-444-1234"); phoneNumbers.add("333-333-1234"); Create a Set called prefixes and use a for-each loop to iterate over the phoneNumbers list. For each phone number, we use the substring method to extract the first 7 characters, which represent the prefix, and add it to the prefixes set using the add method. Finally, use the println method to print the prefixes set, which will contain all of the unique prefixes: --------------------------------------------------------------------------------------------------------------------------------------------------------- import java.util.ArrayList; // import ArrayList class import java.util.HashSet; // import HashSet class import java.util.List; // import List interface import java.util.Set; // import Set interface public class PhoneNumberPrefix { public static void main(String[] args) { // Create a list of phone numbers // Create a set of unique prefixes Set prefixes = new HashSet<>(); // Add the prefix of each phone number to the set // Print the unique prefixes System.out.println("Unique prefixes: " + prefixes); } }

C++ Programming: From Problem Analysis to Program Design

8th Edition

ISBN:9781337102087

Author:D. S. Malik

Publisher:D. S. Malik

Chapter18: Stacks And Queues

Section: Chapter Questions

Problem 16PE: The implementation of a queue in an array, as given in this chapter, uses the variable count to...

See similar textbooks

Related questions

Question

Import the ArrayList and List classes from the java.util package to create a list of phone numbers and also import the HashSet and Set classes from the java.util package to create a set of unique prefixes.
Create a class called PhoneNumberPrefix with a main method that will contain the code to find the unique prefixes.
Create a List called phoneNumbers and use the add method to add several phone numbers to the list.

List<String> phoneNumbers = new ArrayList<>(); phoneNumbers.add("555-555-1234"); phoneNumbers.add("555-555-2345"); phoneNumbers.add("555-555-3456"); phoneNumbers.add("444-444-1234"); phoneNumbers.add("333-333-1234");

Create a Set called prefixes and use a for-each loop to iterate over the phoneNumbers list. For each phone number, we use the substring method to extract the first 7 characters, which represent the prefix, and add it to the prefixes set using the add method.
Finally, use the println method to print the prefixes set, which will contain all of the unique prefixes:

---------------------------------------------------------------------------------------------------------------------------------------------------------

import java.util.ArrayList; // import ArrayList class

import java.util.HashSet; // import HashSet class

import java.util.List; // import List interface

import java.util.Set; // import Set interface

public class PhoneNumberPrefix {

public static void main(String[] args) {

// Create a list of phone numbers

// Create a set of unique prefixes

Set<String> prefixes = new HashSet<>();

// Add the prefix of each phone number to the set

// Print the unique prefixes

System.out.println("Unique prefixes: " + prefixes);

}

Expert Solution

Step by step

Solved in 4 steps with 2 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, computer-science and related others by exploring similar questions and additional content below.