Objects First with Java: A Practical Introduction Using BlueJ (6th Edition)
6th Edition
ISBN: 9780134477367
Author: David J. Barnes, Michael Kolling
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
Textbook Question
Chapter 4, Problem 19E
We know that the first file name is stored at index zero in the ArrayList, and the list stores the file names as strings, so could we write the body of 1istAllFiles along the following lines?
How many println statements would be required to complete the method?
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
1. Copy some text from a news article, paste it in the Notepad++ editor and save it in a textfile named testtext.txt;2. Write a Java program to read the words in the text file into an ArrayList object,display the information about how many words there are in the text file, and display thewords in the order they appear in the text file. Then sort the array and display the sortedarray. Take a screenshot of the output window.3. Submit your text file, the screenshot, and the Java source code file
Java Programming: Below is the shank.java file which is the main method file along with shank.txt. The main goal is to make sure to use this method: (List<String> lines = Files.readAllLines(Paths.get(filename));) to read the text file. Show the full code with the text file being read in the output. There must be no error at all.
package mypack;
import java.io.IOException;import java.nio.charset.Charset;import java.nio.charset.StandardCharsets;import java.nio.file.Files;import java.nio.file.Path;import java.nio.file.Paths;import java.util.List;
public class Shank { public static void main(String[] args) { Path filePath = Paths.get("shank.txt"); Charset charset = StandardCharsets.UTF_8; if (args.length != 1) { System.out.println("Error: Exactly one argument is required."); System.exit(0); }
String filename = args[0];
try { List<String> lines = Files.readAllLines(Paths.get(filename));
for (String line : lines) { try {…
Write a program that reads 10,000 words into an array of strings. The program will then read a second file that contains an undetermined number of words and search the first array for each word. The program will then report the number of words in the second list that were found on the first list.
Read the 10,000 words from the "List of 10000 Random Words" text file into an array of strings. Then read the words from the "Search Words" text file, one at a time, and search for them in the array. Report the count of the number of words found.
Chapter 4 Solutions
Objects First with Java: A Practical Introduction Using BlueJ (6th Edition)
Ch. 4 - Prob. 1ECh. 4 - What happens if you create a new MusicOrganizer...Ch. 4 - Prob. 3ECh. 4 - Prob. 4ECh. 4 - Write a declaration of a local variable called...Ch. 4 - Prob. 6ECh. 4 - Write assignments to the library, cs101. and track...Ch. 4 - If a collection stores 10 objects, what value...Ch. 4 - Write a method call using get to return the fifth...Ch. 4 - Prob. 10E
Ch. 4 - Write a method call to add the object held in the...Ch. 4 - Write a method call to remove the third object...Ch. 4 - Suppose that an object is stored at index 6 in a...Ch. 4 - Add a method called checklndex to the...Ch. 4 - Write an alternative version of checkIndex called...Ch. 4 - Rewrite both the 1istFi1e and removeFi1e methods...Ch. 4 - Prob. 17ECh. 4 - Prob. 18ECh. 4 - We know that the first file name is stored at...Ch. 4 - Prob. 20ECh. 4 - Create a MusicOrganizer and store a few file names...Ch. 4 - Create an ArrayList<String> in the Code Pad by...Ch. 4 - If you wish, you could use the debugger to help...Ch. 4 - Challenge exercise The for-each loop does not use...Ch. 4 - Prob. 25ECh. 4 - Prob. 26ECh. 4 - Prob. 27ECh. 4 - Write out the header of a for-each loop to process...Ch. 4 - Suppose we express the first version of the key...Ch. 4 - Write a while loop (for example, in a method...Ch. 4 - Write a while loop to add up the values 1 to 10...Ch. 4 - Write a method called sum with a while loop that...Ch. 4 - Challenge exercise Write a method isPrime (int n)...Ch. 4 - In the findFirst method, the loop's condition...Ch. 4 - Prob. 35ECh. 4 - Have the MusicOrganizer increment the play count...Ch. 4 - Prob. 37ECh. 4 - Prob. 38ECh. 4 - Prob. 39ECh. 4 - Prob. 40ECh. 4 - Complete the numberOfMembers method to return the...Ch. 4 - Prob. 42ECh. 4 - Prob. 43ECh. 4 - Prob. 44ECh. 4 - Challenge exercise Write a method to play every...Ch. 4 - Prob. 46ECh. 4 - Prob. 47ECh. 4 - Add a close method to the Auction class. This...Ch. 4 - Add a getUnsold method to the Auction class with...Ch. 4 - Suppose the Auction class includes a method that...Ch. 4 - Rewrite getLot so that it does not rely on a lot...Ch. 4 - Prob. 52ECh. 4 - Prob. 53ECh. 4 - Prob. 54ECh. 4 - Prob. 55ECh. 4 - Open the products project and complete the...Ch. 4 - Implement the findProduct method. This should look...Ch. 4 - Implement the numberInStock method. This should...Ch. 4 - Prob. 59ECh. 4 - Challenge exercise Implement a method in...Ch. 4 - Java provides another type of loop: the do-while...Ch. 4 - Prob. 85ECh. 4 - Prob. 86ECh. 4 - Find out about Java's switch-case statement. What...
Additional Engineering Textbook Solutions
Find more solutions based on key concepts
Date Printer Write a program that reads a string from the user containing a date in the form mm/dd/yyyy. It sho...
Starting Out with Python (4th Edition)
Name two different uses for the C++ operator.
Starting Out with C++: Early Objects (9th Edition)
What are the advantages in implementing a language with a pure interpreter?
Concepts of Programming Languages (11th Edition)
Write a parameterized constructor for a base class named Movie with a string field named _title and an int fiel...
Starting out with Visual C# (4th Edition)
List the five major hardware components of a computer system.
Starting Out With Visual Basic (8th Edition)
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.Similar questions
- in python Create a corporate B.S. Generator similar to the following Link: http://www.atrixnet.com/bs-generator.html (Links to an external site.) (Links to an external site.) You must create a loop the runs until the user decides to exit. You will need to import this list aAdverbs = ['appropriately','assertively','authoritatively','collaboratively','compellingly','competently','completely','continually','conveniently','credibly','distinctively','dramatically','dynamically','efficiently','energistically','enthusiastically','uniquely'] aAdjectives = ['accurate','adaptive','alternative','backend','user-centric','user friendly','value-added','vertical','viral','virtual','visionary','web-enabled','wireless','world-class','worldwide'] aVerbs = ['actualize','administrate','aggregate','architect','benchmark','brand','build','cloudify','communicate','conceptualize','coordinate','create','cultivate','unleash','utilize','visualize','whiteboard'] aNouns = ['action…arrow_forwardPlease help me code in java: Write a program that reads two files “Data1.txt”, “Data2.txt”; adding their corresponding elements produces an output file “output.txt”. If the number of elements are not equal, fill the elements of the smaller file up with “0” s. Sample output: Elements of the “Data1.txt”: 3 5 7 8 9 Elements of the “Data2.txt”: 45 11 Elements of the “Output.txt”: 48 16 7 8arrow_forwardWrite this program in Java using a custom method. Implementation details You will implement this program in a specific way in order to gain some experience with loops, arrays and array lists. Use an array of strings to store the 4 strings listed in the description. Use a do-while loop for your 'game engine'. This means the game starts once the user enters money. The decision to stop occurs at the bottom of the loop. The do-while loop keeps going until the user quits, or there is no money left. The pseudocode for this 'game engine' is shown below: determine the fruits to display (step 3 below) and print them determine if there are 3 or 4 of the same image display the results update the customer balance as necessary prompt to play or quit continue loop if customer wants to play and there's money for another game. Use the Random class to generate a random number between 0 and 3. This random number will be an index into the array of strings. Add the string at that index to an…arrow_forward
- In this programming challenge, you will create a simple trivia game for two players. The program will work like this: • Read the contents of the trivia.txt file into an ArrayList . • Starting with player 1, each player gets a turn at answering one trivia question. (For instance, if there are 10 questions, 5 for each player.) When a question is displayed, four possible answers are also displayed. Only one of the answers is correct, and if the player selects the correct answer, he or she earns a point. • After answers have been selected for all of the questions, the program displays the number of points earned by each player and declares the player with the highest number of points the winner, same as the sample execution. You are to design a Question class to hold the data for a trivia question. The Question class should have String fields for the following data: • A trivia question • Possible answer 1 • Possible answer 2 • Possible answer 3 • Possible answer 4 • The number of the…arrow_forwardpackage Q2;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.util.ArrayList;import java.util.Scanner;public class Question2 {public static void main(String[] args) throws FileNotFoundException {/*** Part a* Finish creating an ArrayList called NameList that stores the names in the file Names.txt.*/ArrayList<String> NameList;/*** Part b* Replace null on the right-hand-side of the declaration of the FileInputStream object named inputStream* so that it is initialized correctly to the Names.txt file located in the folder specified in the question description*/FileInputStream inputStream = null;Scanner scnr = new Scanner(inputStream); //Do not modify this line of code/*** Part c* Using a loop and the Scanner object provided, read the names from Names.txt* and store them in NameList created in Part a.*//*** Part d* Reorder the names in the ArrayList so that they appear in reverse alphabetical order.*/// System.out.println("NameList after correct ordering: "…arrow_forwardpackage Q2;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.util.ArrayList;import java.util.Scanner;public class Question2 {public static void main(String[] args) throws FileNotFoundException {/*** Part a* Finish creating an ArrayList called NameList that stores the names in the file Names.txt.*/ArrayList<String> NameList = new ArrayList<String>();/*** Part b* Replace null on the right-hand-side of the declaration of the FileInputStream object named inputStream* so that it is initialized correctly to the Names.txt file located in the folder specified in the question description*/FileInputStream inputStream = new FileInputStream("Names.txt");Scanner scnr = new Scanner(inputStream); //Do not modify this line of code/*** Part c* Using a loop and the Scanner object provided, read the names from Names.txt* and store them in NameList created in Part a.*/while (scnr.hasNext()) {//reading each string from text file and adding to…arrow_forward
- write a program that reads the students.txt file and stores the name of the student and the grade information as a student object in an arraylist sorts the students names based on their first grade in decreasing order using the selection sort algorithm writes the sorted list as the students last name , middle name (if theres one), first name , and grade information into a text file output example: Robison, Lee 95 80 Green, Alex R 85 60 Waston, Zoe G 100 80 use javaarrow_forwardpackage Q2;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.util.ArrayList;import java.util.Scanner;public class Question2 {public static void main(String[] args) throws FileNotFoundException {/*** Part a* Finish creating an ArrayList called NameList that stores the names in the file Names.txt.*/ArrayList<String> NameList = new ArrayList<String>();/*** Part b* Replace null on the right-hand-side of the declaration of the FileInputStream object named inputStream* so that it is initialized correctly to the Names.txt file located in the folder specified in the question description*/FileInputStream inputStream = new FileInputStream("Names.txt");Scanner scnr = new Scanner(inputStream); //Do not modify this line of code/*** Part c* Using a loop and the Scanner object provided, read the names from Names.txt* and store them in NameList created in Part a.*/while (scnr.hasNext()) {//reading each string from text file and adding to…arrow_forwardFor the ReadWords class that is used to read the content of a given text file, which of the following represent a valid no-arguments constructor definition? Select one: a. None of these O b. public ArrayList ReadWords() throws FileNotFoundException {...} O c. public void ReadWords() throws FileNotFoundException {...} O d. public ReadWords() throws FileNotFoundException { ...}arrow_forward
- Java question: A text file called names.txt contains one name per line, e.g.,AllisonJohnWilliamJohnetc.Names can be duplicated in the file. Write the code that:1. Reads the names line by line.2. Stores each name and the number of times the name appears in one collection.3. Prints the number of different names to the console.4. Prints the names and how many times each name appears on the console.Think about what data structure would work in associating each name with the number of times it appears in the file. You do not need to write imports.arrow_forwardWrite in Python: A contact list is a place where you can store a specific contact with other associated information such as a phone number, email address, birthday, etc. Write a program that first takes in word pairs that consist of a name and a phone number (both strings), separated by a comma. That list is followed by a name, and your program should output the phone number associated with that name. Assume the search name is always in the list. Ex: If the input is: Joe,123-5432 Linda,983-4123 Frank,867-5309 Frank the output is: 867-5309arrow_forward1. Write a program to input a list of names (strings) from the user and store them in an ArrayList. The input can be terminated by entering the empty string or byentering the string “quit”. 2. Add further functionality to your program so that it searches the ArrayList to find the first string and the last string according to dictionary ordering and then prints out these strings (names). Do this exercise without sorting the names in the ArrayList. For example, if the list contains the following names: Charles Darwin Albert Einstein Issac Newton Tony Hoare Grace Hopper Edgar Dijkstra Ada Lovelace Charles Babbage Stephen Hawking Your program should output:The first name in the list in alphabetical order is: Ada Lovelace The last name in the list in alphabetical order is: Tony Hoarearrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Database System ConceptsComputer ScienceISBN:9780078022159Author:Abraham Silberschatz Professor, Henry F. Korth, S. SudarshanPublisher:McGraw-Hill Education
Starting Out with Python (4th Edition)Computer ScienceISBN:9780134444321Author:Tony GaddisPublisher:PEARSON
Digital Fundamentals (11th Edition)Computer ScienceISBN:9780132737968Author:Thomas L. FloydPublisher:PEARSON
C How to Program (8th Edition)Computer ScienceISBN:9780133976892Author:Paul J. Deitel, Harvey DeitelPublisher:PEARSON
Database Systems: Design, Implementation, & Manag...Computer ScienceISBN:9781337627900Author:Carlos Coronel, Steven MorrisPublisher:Cengage Learning
Programmable Logic ControllersComputer ScienceISBN:9780073373843Author:Frank D. PetruzellaPublisher:McGraw-Hill Education
Database System Concepts
Computer Science
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:McGraw-Hill Education
Starting Out with Python (4th Edition)
Computer Science
ISBN:9780134444321
Author:Tony Gaddis
Publisher:PEARSON
Digital Fundamentals (11th Edition)
Computer Science
ISBN:9780132737968
Author:Thomas L. Floyd
Publisher:PEARSON
C How to Program (8th Edition)
Computer Science
ISBN:9780133976892
Author:Paul J. Deitel, Harvey Deitel
Publisher:PEARSON
Database Systems: Design, Implementation, & Manag...
Computer Science
ISBN:9781337627900
Author:Carlos Coronel, Steven Morris
Publisher:Cengage Learning
Programmable Logic Controllers
Computer Science
ISBN:9780073373843
Author:Frank D. Petruzella
Publisher:McGraw-Hill Education
Constants, Variables, Data types, Keywords in C Programming Language Tutorial; Author: LearningLad;https://www.youtube.com/watch?v=d7tdL-ZEWdE;License: Standard YouTube License, CC-BY