Introduction to Java Programming and Data Structures, Comprehensive Version (11th Edition)
11th Edition
ISBN: 9780134670942
Author: Y. Daniel Liang
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Concept explainers
Question
Chapter 12, Problem 12.18PE
Program Plan Intro
Add package statement
- Import the required packages into the program.
- Declare the required variables.
- Get the file input path from the user as the command line arguments.
- Use the try{}..catch() block for exception handling.
- Check the input argument value is valid or not.
- Check the input argument path exists or not.
- Check the input path is a directory or not.
- If it is not a directory, then display the error message.
- If it is a directory, then list the file content of the directory.
- If the file contents are directory, then get the directory name starting with “chapter” and prepare a insert package statement.
- Call the “insertIntoFilesInDirectory()” method to insert the package statement.
- The “insertIntoFilesInDirectory()” method lists the files available in each directory.
- This method gets the files name that end with “.java”.
- This method calls the “insertPackageStatment()” method to insert the package name in each file ending with the name “.java”.
- The “insertPackageStatment()” method reads each file that ends with the name “.java” and appends the package name as “package chapteri;”at the beginning of each file.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
(Write a C++ program)
This homework is from our textbook page 459 # 16. The Dodgers recently won the World Series vs the Tampa Bay Rays. Attached are two files:
Teams.txt - This file contains a list of serveral Major League baseball teams in alphabetical order. Each team is listed in the file has won the World Series at least once.
WorldSeries Winners.txt - This file contains a chronological list of the World Series' winning teams from 1903-2020. (The first line of the file is the name of the team that won in 1903, and the last line is the name of the team that won in 2020. Note the World Series was not played in 1904 or 1994.)
Write a program that displays the contents of the Teams.txt file on the screen and prompts the user to enter the name of one of the teams. The program should then display the number of times that team has won the World Series in the time period from 1903 to 2020.
In the program, 2 arrays are needed: TeamList array and Winners array.
TeamList array will…
(True/False): When a program’s source code is modified, it must be assembled and linkedagain before it can be executed with the changes
(True/False): When a program's source code is changed, it must be reassembled and linked before it can be executed.
Chapter 12 Solutions
Introduction to Java Programming and Data Structures, Comprehensive Version (11th Edition)
Ch. 12.2 - Prob. 12.2.1CPCh. 12.2 - Prob. 12.2.2CPCh. 12.2 - Prob. 12.2.3CPCh. 12.2 - Prob. 12.2.4CPCh. 12.2 - Prob. 12.2.5CPCh. 12.2 - Show the output of the following code:Ch. 12.3 - Prob. 12.3.1CPCh. 12.3 - Prob. 12.3.2CPCh. 12.4 - Prob. 12.4.1CPCh. 12.4 - Prob. 12.4.2CP
Ch. 12.4 - Prob. 12.4.3CPCh. 12.4 - Prob. 12.4.4CPCh. 12.4 - Prob. 12.4.5CPCh. 12.4 - Prob. 12.4.6CPCh. 12.4 - What is displayed when running the following...Ch. 12.4 - Prob. 12.4.8CPCh. 12.4 - What does the method getMessage() do?Ch. 12.4 - What does the method printStackTrace() do?Ch. 12.4 - Prob. 12.4.11CPCh. 12.4 - Prob. 12.4.12CPCh. 12.5 - Prob. 12.5.1CPCh. 12.6 - Prob. 12.6.1CPCh. 12.7 - Prob. 12.7.1CPCh. 12.8 - Prob. 12.8.1CPCh. 12.9 - Prob. 12.9.1CPCh. 12.9 - Prob. 12.9.2CPCh. 12.10 - What is wrong about creating a File object using...Ch. 12.10 - How do you check whether a file already exists?...Ch. 12.10 - Can you use the File class for I/O? Does creating...Ch. 12.11 - Prob. 12.11.1CPCh. 12.11 - Prob. 12.11.2CPCh. 12.11 - Prob. 12.11.3CPCh. 12.11 - Prob. 12.11.4CPCh. 12.11 - What will happen if you attempt to create a...Ch. 12.11 - Prob. 12.11.6CPCh. 12.11 - Suppose you enter 45 57, 8 789, then press the...Ch. 12.11 - Prob. 12.11.8CPCh. 12.12 - How do you create a Scanner object for reading...Ch. 12.13 - Prob. 12.13.1CPCh. 12.13 - Simplify the code in lines 20-28 as follows: 1....Ch. 12 - Prob. 12.1PECh. 12 - (InputMismatchException) Write a program that...Ch. 12 - (ArrayIndexOutOfBoundsException) Write a program...Ch. 12 - (IllegalArgumentException) Modify the Loan class...Ch. 12 - (IllegalTriangleException) Programming Exercise...Ch. 12 - (NumberFormatException) Listing 6.8 implements the...Ch. 12 - Prob. 12.7PECh. 12 - Prob. 12.8PECh. 12 - Prob. 12.9PECh. 12 - Prob. 12.10PECh. 12 - Prob. 12.11PECh. 12 - (Reformat Java source code) Write a program that...Ch. 12 - (Count characters, words, and lines in a file)...Ch. 12 - (Process scores in a text file) Suppose a text...Ch. 12 - (Write/read data) Write a program to create a file...Ch. 12 - Prob. 12.16PECh. 12 - (Game: hangman) Rewrite Programming Exercise 7.35....Ch. 12 - Prob. 12.18PECh. 12 - (Count words) Write a program that counts the...Ch. 12 - Prob. 12.20PECh. 12 - (Data sorted?) Write a program that reads the...Ch. 12 - Prob. 12.22PECh. 12 - (Process scores in a text file on the Web) Suppose...Ch. 12 - (Create large dataset) Create a data file with...Ch. 12 - (Create a directory) Write a program that prompts...Ch. 12 - Prob. 12.26PECh. 12 - (Replace words) Suppose you have a lot of files in...Ch. 12 - (Rename files) Suppose you have a lot of files in...Ch. 12 - (Rename files) Suppose you have several files in a...Ch. 12 - (Occurrences of each letter) Write a program that...Ch. 12 - (Baby name popularity ranking) The popularity...Ch. 12 - (Ranking summary) Write a program that uses the...
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
- (True/False): An Object file is produced by the Linkerarrow_forward(Class Average: Reading Student Records from a CSV File) Use Python Use the csv module to read the grades.csv file from the previous exercise (exercise 9.3). Display the data in tabular format, including an additional column showing each student’s average to the right of that student’s three exam grades and an additional row showing the class average on each exam below that exam’s column. This is exercise 9.3 # Importing csv moduleimport csv# empty list to store datadata = []columns = ["firstname", "lastname", "grade1", "grade2", "grade3"]filename = "grades.csv"for i in range(3):firstname = input("Enter First Name : ")lastname = input("Enter Last Name : ")grade1 = float(input("Enter Grade 1 : "))grade2 = float(input("Enter Grade 2 : "))grade3 = float(input("Enter Grade 3 : "))data.append([firstname, lastname, grade1, grade2, grade3])print()# write data and columns as csv filewith open(filename, 'w') as csvfile:# creating a csv writer objectcsvwriter = csv.writer(csvfile)# writing the…arrow_forward(Creating Custom Exception Class) Write a Password class that stores a password string. Passwords must contain at least seven alpha-numeric characters, with at least one letter and one digit. Also write an InvalidPasswordException class that extends Exception. The Password constructor should throw an InvalidPasswordException, which should report an appropriate message based on a given string (e.g. if the string contains no digits, the exception should report this fact). Write a GUI program to prompt the user to enter a password and report an InvalidPasswordException if an invalid password is entered. Please teach and help me how to deisgn the program based on the two files given .Some sample screenshots are shown below: InvalidPasswordException.java public class InvalidPasswordException extends Exception{ public InvalidPasswordException (String errMsg){ super(errMsg); } } Password.java public class Password {private String passwordstr; public…arrow_forward
- (Intro to Java) Only use while loop or for loop. DO NOT use try loop! DO NOT use null. Avoid using breaks! Tracking Customers This program will read in a series of names, along with an associated gender, from an input file of unknown length. The program uses a while loop to read in each name from the file by using the hasNextLine() method from the Scanner class. Please use a while loop for practice, although you could also write this assignment using a for loop to read from the file. As you read in each name, you will store it in an array, along with a title (Mr. or Ms. or Mx.) dependent on the stated gender. The first line of each file will contain the number of names contained in the file (hint: this is the same structure as the input file in your assignment 18.2). Additionally, this program should have two methods, as follows: The first method: The method is named extractInitial It takes a String parameter It extracts the first letter (initial) from the String parameter It…arrow_forwardUse files( handling exception)arrow_forward(True/False): In protected mode, each procedure call uses a minimum of 4 bytes of stackspace.arrow_forward
- Object-Oriented Programming : (Programming Language is C#) Please with More comments, Thanks a lot!arrow_forwardPLEASE HELP (AGAIN): Perhaps I am simply in the dark about how to use .h files. I have no file to add. These are the instructions: 1. Write a class to represent Roman numerals. a. The class should have two constructors.: (1) A default constructor (2) A constructor that takes a string as a paramter (i.e., string representing a roman numeral) b. This class should have the following member functions, in addition to the above constructors: (1) set - sets the member variable to the values in the function parameter (2) print - print the converted integer value (3) convert the roman number string to a positive integer (4) print the roman number string c. This class should have two PRIVATE member variables: (1) string to hold the roman numeral string (2) integer to hold the converted value 3. Create: a. a class definition file (*.h) b. a class implementation file (*.cpp) c. a client program to test your class (*.cpp) d. a project for these code files 4. The client program…arrow_forward[JAVA Code] In this lab, you will open the file, flowers.dat, and read input from that file in a pre-written Java program. The program should read and print the names of flowers and whether they are grown in shade or sun. // Flowers.java - This program reads names of flowers and whether they are grown in shade or sun from an input // file and prints the information to the user's screen. // Input: flowers.dat. // Output: Names of flowers and the words sun or shade. import java.io.*; // Import class for file input. public class Flowers { public static void main(String args[]) throws Exception { // Declare variables here // Open input file. // Create BufferedReader object. // Write while loop that reads records from file. // Print flower name and the words sun or shade. br.close(); System.exit(0); } // End of main() method. } // End of Flowers class.arrow_forward
- (Convert decimals to fractions)Write a program that prompts the user to enter a decimal number and displays the number in a fraction.Hint: read the decimal number as a string, extract the integer part and fractional part from the string, and use the Rational class in LiveExample 13.13 to obtain a rational number for the decimal number. Use the template athttps://liveexample.pearsoncmg.com/test/Exercise13_19.txt The problem can not use BigInteger //Below is the Rational LiveExample 13.13 that goes with the problem/question; notice "long" instead of "BigInteger" class Rational extends Number implements Comparable<Rational> { // Data fields for numerator and denominator private long numerator = 0; private long denominator = 1; /** Construct a rational with default properties */ public Rational() { this(0, 1); } /** Construct a rational with specified numerator and denominator */ public Rational(long numerator, long denominator) { long gcd = gcd(numerator,…arrow_forward(Integral Calculator) JAVA GUI Program //OOParrow_forward(Throwing Exceptions from a catch) Suppose a program throws an exception and the appropriate exception handler begins executing. Now suppose that the exception handler itself throwsthe same exception. Does this create infinite recursion? Write a program to check your observation.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
C++ Programming: From Problem Analysis to Program...Computer ScienceISBN:9781337102087Author:D. S. MalikPublisher:Cengage Learning
C++ Programming: From Problem Analysis to Program...
Computer Science
ISBN:9781337102087
Author:D. S. Malik
Publisher:Cengage Learning