Introduction to Java Programming and Data Structures, Comprehensive Version (11th Edition)
11th Edition
ISBN: 9780134670942
Author: Y. Daniel Liang
Publisher: PEARSON
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Textbook Question
Chapter 17.7, Problem 17.7.2CP
Create a RandomAccessFi1e stream for the file address.dat to allow the updating of student information in the file. Create a DataOutputStream for the file address.dat. Explain the differences between these two statements.
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Chapter 17 Solutions
Introduction to Java Programming and Data Structures, Comprehensive Version (11th Edition)
Ch. 17.2 - What is a text file and what is a binary file? Can...Ch. 17.2 - How do you read or write text data in Java? What...Ch. 17.3 - Prob. 17.3.1CPCh. 17.3 - How is a Java character represented in the memory,...Ch. 17.3 - If you write the string ABC to an ASCII text file,...Ch. 17.3 - If you write the string 100 to an ASCII text file,...Ch. 17.3 - What is the encoding scheme for representing a...Ch. 17.4 - Prob. 17.4.1CPCh. 17.4 - Why should you always close streams? How do you...Ch. 17.4 - Prob. 17.4.3CP
Ch. 17.4 - Does FileInputStream/Fi1eOutputStream introduce...Ch. 17.4 - What will happen if you attempt to create an input...Ch. 17.4 - How do you append data to an existing text file...Ch. 17.4 - Prob. 17.4.7CPCh. 17.4 - What is written to a file using writeByte(91) on a...Ch. 17.4 - How do you check the end of a file in an input...Ch. 17.4 - What is wrong in the following code? Import...Ch. 17.4 - Suppose you run the following program on Windows...Ch. 17.4 - After the following program is finished, how many...Ch. 17.4 - For each of the following statements on a...Ch. 17.4 - What are the advantages of using buffered streams?...Ch. 17.5 - How does the program check if a file already...Ch. 17.5 - How does the program detect the end of the file...Ch. 17.5 - How does the program count the number of bytes...Ch. 17.6 - Prob. 17.6.1CPCh. 17.6 - Prob. 17.6.2CPCh. 17.6 - Is it true that any instance of...Ch. 17.6 - Prob. 17.6.4CPCh. 17.6 - Prob. 17.6.5CPCh. 17.6 - What will happen when you attempt to run the...Ch. 17.7 - Can RandomAccessFi1e streams read and write a data...Ch. 17.7 - Create a RandomAccessFi1e stream for the file...Ch. 17.7 - What happens if the file test.dat does not exist...Ch. 17 - (Create a text file) Write a program to create a...Ch. 17 - (Create a binary data file) Write a program to...Ch. 17 - (Sum all the integers in a binary data file)...Ch. 17 - (Convert a text file into UTF) Write a program...Ch. 17 - Prob. 17.5PECh. 17 - Prob. 17.6PECh. 17 - Prob. 17.7PECh. 17 - (Update count) Suppose that you wish to track how...Ch. 17 - (Address book) Write a program that stores,...Ch. 17 - (Split files) Suppose you want to back up a huge...Ch. 17 - (Split files GUI) Rewrite Exercise 17.10 with a...Ch. 17 - Prob. 17.12PECh. 17 - (Combine files GUI) Rewrite Exercise 17.12 with a...Ch. 17 - (Encrypt files) Encode the file by adding 5 to...Ch. 17 - (Decrypt files) Suppose a file is encrypted using...Ch. 17 - (Frequency of characters) Write a program that...Ch. 17 - (BitOutputStream) Implement a class named...Ch. 17 - (View bits) Write the following method that...Ch. 17 - (View hex) Write a program that prompts the user...Ch. 17 - (Hex editor) Write a GUI application that lets the...
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- The teacher at a school needs help grading an exam with a number of True/False questions. The students’ IDs and test answers are stored in a file. The first entry of the file contains the answer to the test in the form: TTFTFTTTFTFTFFTTFTTF Every other entry in the file is the student’s ID, followed by a blank, followed by the students’ response. For instance, the entry: ABC54102 T FTFTFTTTFTTFTTF TF The student’s ID is ABC54102, answer to question 1 is True, the answer to question 3 is False. Also, the student did not answer question 2 and question 18. The exam has 20 questions. Here is the grading policy: each correct answer is awarded two points, each wrong answer get -1 point, and no answer gets 0 point. Write a program that processes the test data. The output should be the student’s ID, followed by the answers, followed by the test score (total points), followed by the test grade. Assume the following grade scale will be used: 90%-100%, A; 80%-89.99%, B; 70%-79.99%, C; 60%-69.99%,…arrow_forwardWrite a program that generates student records in a database file. Your program should be able to generate at least 10 records. The format in the database should be: student name, student id The first student id should be 20180001, second id will be 20180001 and so forth. Show screenshot of scriptarrow_forwardWrite a program that reads the student information from a tab separated values (tsv) file. The program then creates a text file that records the course grades of the students. Each row of the tsv file contains the Last Name, First Name, Midterm1 score, Midterm2 score, and the Final score of a student. A sample of the student information is provided in StudentInfo.tsv. Assume the number of students is at least 1 and at most 20. Assume also the last names and first names do not contain whitespaces. The program performs the following tasks: . Read the file name of the tsv file from the user. • Open the tsv file and read the student information. • Compute the average exam score of each student. • Assign a letter grade to each student based on the average exam score in the following scale: 。 A: 90=arrow_forwardWrite a program that reads a text file and outputs the 100 most frequent words in the text. You have to determine the appropriate data structure to make this task efficient and then develop an algorithm to solve the problem.arrow_forwardWrite a program that reads the student information from a tab separated values (tsv) file. The program then creates a text file that records the course grades of the students. Each row of the tsv file contains the Last Name, First Name, Midterm1 score, Midterm2 score, and the Final score of a student. A sample of the student information is provided in StudentInfo.tsv. Assume the number of students is at least 1 and at most 20. The program performs the following tasks: Read the file name of the tsv file from the user.Open the tsv file and read the student information.Compute the average exam score of each student.Assign a letter grade to each student based on the average exam score in the following scale:A: 90 =< xB: 80 =< x < 90C: 70 =< x < 80D: 60 =< x < 70F: x < 60Compute the average of each exam.Output the last names, first names, exam scores, and letter grades of the students into a text file named report.txt. Output one student per row and separate the…arrow_forwardWrite a program that reads the student information from a tab separated values (tsv) file. The program then creates a text file that records the course grades of the students. Each row of the tsv file contains the Last Name, First Name, Midterm1 score, Midterm2 score, and the Final score of a student. A sample of the student information is provided in StudentInfo.tsv. Assume the number of students is at least 1 and at most 20. 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The first entry in the file contains answers to the test in the form:TFFTFFTTTTFFTFTFTFTTEvery other entry in the file is the student ID, followed by a blank, followed by the student’s responses. For example, the entry:ABC54301 TFTFTFTT TFTFTFFTTFTindicates that the student ID is ABC54301 and the answer to question 1 is True, the answer to question 2 is False, and so on. This student did not answer question 9. The exam has 20 questions, and the class has more than 150 students. Each correct answer is awarded two points, each wrong answer gets one point deducted, and no answer gets zero points. Write a program in C++ that processes the test data. The output should be the student’s ID, followed by the answers, followed by the test score, followed by the test grade. 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