37.11 File Random Access
In this program you will use RandomAccessFile to read and write a binary file (Binary.dat).
Step 1) Create a RandomAccessFile object for the Binary.dat file. Use the 'rws' tag to ensure that changes happen immediately. Create a ArrayList of type Long as well.
Stepl 2) The data in Binary.dat is organized logically as sets of triples: a price (double, 8 bytes), an amount (int, 4 bytes), and a description (UTF string, indefinite). Use the readDouble(), readInt(), and readUTF() methods of RandomAccessFile to read these triples until the end of the file is reached. The most straightforward way to do this is to get the length of Binary.dat ( use the length() method of RandomAccessFile ) before the loop and then repeat the loop as long as the current position ( use getFilePointer() of RandAccessFile to get this ) is less than the file length. After you read each triple, display the values on a line separate by a space and also save the current file position on the ArrayList (use the RandomAccessFile method getFilePointer() to get the current file position). You program should display the following:
Submit your code to pass Test 1.
Step 3)
Write a loop that goes through the Binary.dat file and increases all of the prices by 5%. You will need to use the seek() and writeDoublle() of RandomAccessFile. The values that you saved in the ArrayList will be helpful. Submit your code. to pass Test 2.
import java.io.*;
import java.util.*;
public class FileRandomAccess {
public static void main(String [] args) {
/* Replace this comment with your code. */
}
}
.
This is ppt prsented by me in class in this ppt i include file handling in which i tell us about the types of files
creation of text file in C ++ ,updating a text file in C++ , printing the inforamtion in text file .creation of binary file in C ++ ,updating a binary file in C++ , printing the inforamtion in binary file, text file function and binary file function in c++ , File ponters ,syntax of every thing and use of file pointers and many more.
This is ppt prsented by me in class in this ppt i include file handling in which i tell us about the types of files
creation of text file in C ++ ,updating a text file in C++ , printing the inforamtion in text file .creation of binary file in C ++ ,updating a binary file in C++ , printing the inforamtion in binary file, text file function and binary file function in c++ , File ponters ,syntax of every thing and use of file pointers and many more.
In this chapter we will review how to work with text files in C#. We will explain what a stream is, what its purpose is, and how to use it. We will explain what a text file is and how can you read and write data to a text file and how to deal with different character encodings. We will demonstrate and explain the good practices for exception handling when working with files. All of this will be demonstrated with many examples in this chapter
Description 1) Create a Lab2 folder for this project2.docxtheodorelove43763
Description
1) Create a Lab2 folder for this project
2) Use the main driver program (called Writers.java) that I provide below to write files of differing types. You can copy and paste this code, but make sure the spaces variable copies correctly. The copy and paste operation eliminates the spaces between the quotes on some systems.
3) In the writers program, fill in the code for the three classes (Random, Binary, and Text). In each class, you will need a constructor, a write method, and a close method. The constructor opens the file, the write method writes a record, and the close method closes the file.
4) Other than what I just described, don't change the program in any way. The program asks for a file type (random, binary, or text) and the name of the file to create. In a loop it inputs a person's name (string), a person's age (int), and a person's annual salary (double). It writes to a file of the appropriate type. The loop terminates when the user indicates that inputting is complete. The program then asks if another file should be created. If the answer is yes, the whole process starts again. This and all of the java driver programs should be saved in your lab2 folder but not in the cs258 sub-folder.
5) Note: The method signatures for accessing all of the three types of files (binary, random, and text) are on the class web-site. Go to power point slides and click on week two. This will help if you didn't take accurate notes in class.
6) Write a main program to read binary files (BinReader.java). This program only needs to be able to read and display records from a Binary file that was created by the writers program.
7) Write a main program to read random files (RandReader.java). This program only needs to be able to read and display records from a Binary file that was created by the writers program. Make sure that this program reads and displays records in reverse order. DO NOT USE AN ARRAY!!!
8) In your Lab2 folder, create a subfolder within lab2 named cs258. Download Keyboard.java from the class web-site to that folder. Add a new first line of Keyboard.java with the statement, package cs258;. This line will make Keyboard.java part of the cs258 package. The driver program shown below has an import ‘cs258.*;’ statement to access the java files in this package.
9) Modify Keyboard.java. We want to extend this class so it can be extended to allow access to multiple files. The changes follow:
a. Remove all static references. This is necessary so that there will be an input stream variable (in) in each object.
b. Change the private modifier of the in and current_token variables to protected. Change the private modifier to protected in all of the signature lines of the overloaded getNextToken methods.
c. Create a constructor that instantiates the input stream for keyboard input. Remove the instantiation from the original declaration line for the in variable. The constructor doesn't need any parameters.
10)Create a class TextR.
CMPE2300 – Lab01 - Defrag-o-maticIn this lab you will crea.docxmary772
CMPE2300 – Lab01 - Defrag-o-matic
In this lab you will create a simulator to implement a file system defragmentation. Prior to
SSDs, file systems benefited from ensuring files that were comprised of multiple disk
partition units were allocated and adjacent on disk. This ensured minimum head
movement for read/write of specific files.
Our goal is to read in a text file formatted as one file allocation unit per row with a data
component indicating the file name, a sequence number indicating part N ( of M ) units,
and a next value indicating where the next unit resides. Once loaded and displayed the
simulator will allow a basic defragmentation to be done, attempting to group files into
adjacent allocation blocks.
Program Specification
Your project will require use of the CDrawer.
You will need to define a structure to represent file allocation units, comprised of :
• a string - representing the filename ( it will be one character for our simulation )
• an integer - representing the sequence number of this allocation unit
• an integer - representing the allocation unit of the next part of the file.
Assumptions :
A next value of -1 indicates that this allocation unit is empty
A next value of -2 indicates that this is the last allocation unit of this file
Any file system load will always have > 0 empty units
Your UI will have 3 buttons :
[Load FileSystem]
[Verify FileSystem]
[Defragment] / Toggling to disable defragmentation
And a listbox for status output – population should always use insert so newest additions
are first.
Part I - Load FileSystem
Your application will be allowed to create class level members for the following :
• List of File Allocation Units ( structure )
• CDrawer
• integer representing CDrawer File Allocation Scale ( not CDrawer scale )
• constant integer representing the maximum width for the CDrawer in pixels = 1000
Bind your [Load FileSystem] click event to a method in your form constructor.
[Load FileSystem]
Dynamically create an OpenFileDialog, and using System.IO.Path.GetFullPath and the
appropriate Environment variable, set the Initial directory to the root source ( this will allow
easy loading of the test files in your project ). Using System.IO.File.ReadAllLines(), read the
user selected file in.
For each line read, you may use split() to separate the 3 expected elements to be
processed. Process as required to make and add a structure entry to your List for each.
Upon completion, add a status line in the form : “Load FileSystem: Loaded N units”
Now that the load is complete, it needs to be displayed in the CDrawer. We want our
displayed grid to be square – in number ( ie. 6 x 6 ). Given the load number, determine the
smallest dimension that can be used. The “scale” is the file unit cell height, it will be 4
times wider than tall to fit our output requirements. Given the fixed CDrawer width,
determine the “scale”, and close any existing CDrawer before allocating a new CDrawer of
our calc.
28- Which of the following infectious agents has the smallest genome s.docxHarryyQZColemane
28. Which of the following infectious agents has the smallest genome size of any self-replicating biological system (and does not code for even one single protein)? A. the double-stranded DNA viruses B. the single-stranded RNA viruses C. the single-stranded RNA viroids D. the single-stranded DNA viruses E. the double-stranded RNA viruses
.
2-4 Jomens Ltd also owns shares in other listed companies- such as Mic.docxHarryyQZColemane
2.4 Jomens Ltd also owns shares in other listed companies, such as Microsoft and MTN. Suppose Jomens has asked you to manage their large share portfolio. You would like to buy and/or sell options on many of the shares they owns. Describe the types of options you would buy or sell, as well as your rationale, given the following circumstances: a. Jomens Ltd owns 10 000 Microsoft shares. You believe it is going to fall in price, but they won't let you sell it because the late founder told them never to let it go. How do you protect Jomens Ltd from the impending price decline? (4 marks) b. Your analysis suggests that the ordinary shares of MTN is poised to increase in value sharply over the next year. Jomens Ltd doesn't want to buy any of the shares, but they want you to use options to profit if the price rises. What do you do? (4 marks) 2.5 Why do you think the most actively traded options tend to be the ones that are near the money? (3 marks) 2.6 Briefly distinguish between American option and European Option. (3 marks)
.
More Related Content
Similar to 37-11 File Random Access In this program you will use RandomAccessFile.docx
In this chapter we will review how to work with text files in C#. We will explain what a stream is, what its purpose is, and how to use it. We will explain what a text file is and how can you read and write data to a text file and how to deal with different character encodings. We will demonstrate and explain the good practices for exception handling when working with files. All of this will be demonstrated with many examples in this chapter
Description 1) Create a Lab2 folder for this project2.docxtheodorelove43763
Description
1) Create a Lab2 folder for this project
2) Use the main driver program (called Writers.java) that I provide below to write files of differing types. You can copy and paste this code, but make sure the spaces variable copies correctly. The copy and paste operation eliminates the spaces between the quotes on some systems.
3) In the writers program, fill in the code for the three classes (Random, Binary, and Text). In each class, you will need a constructor, a write method, and a close method. The constructor opens the file, the write method writes a record, and the close method closes the file.
4) Other than what I just described, don't change the program in any way. The program asks for a file type (random, binary, or text) and the name of the file to create. In a loop it inputs a person's name (string), a person's age (int), and a person's annual salary (double). It writes to a file of the appropriate type. The loop terminates when the user indicates that inputting is complete. The program then asks if another file should be created. If the answer is yes, the whole process starts again. This and all of the java driver programs should be saved in your lab2 folder but not in the cs258 sub-folder.
5) Note: The method signatures for accessing all of the three types of files (binary, random, and text) are on the class web-site. Go to power point slides and click on week two. This will help if you didn't take accurate notes in class.
6) Write a main program to read binary files (BinReader.java). This program only needs to be able to read and display records from a Binary file that was created by the writers program.
7) Write a main program to read random files (RandReader.java). This program only needs to be able to read and display records from a Binary file that was created by the writers program. Make sure that this program reads and displays records in reverse order. DO NOT USE AN ARRAY!!!
8) In your Lab2 folder, create a subfolder within lab2 named cs258. Download Keyboard.java from the class web-site to that folder. Add a new first line of Keyboard.java with the statement, package cs258;. This line will make Keyboard.java part of the cs258 package. The driver program shown below has an import ‘cs258.*;’ statement to access the java files in this package.
9) Modify Keyboard.java. We want to extend this class so it can be extended to allow access to multiple files. The changes follow:
a. Remove all static references. This is necessary so that there will be an input stream variable (in) in each object.
b. Change the private modifier of the in and current_token variables to protected. Change the private modifier to protected in all of the signature lines of the overloaded getNextToken methods.
c. Create a constructor that instantiates the input stream for keyboard input. Remove the instantiation from the original declaration line for the in variable. The constructor doesn't need any parameters.
10)Create a class TextR.
CMPE2300 – Lab01 - Defrag-o-maticIn this lab you will crea.docxmary772
CMPE2300 – Lab01 - Defrag-o-matic
In this lab you will create a simulator to implement a file system defragmentation. Prior to
SSDs, file systems benefited from ensuring files that were comprised of multiple disk
partition units were allocated and adjacent on disk. This ensured minimum head
movement for read/write of specific files.
Our goal is to read in a text file formatted as one file allocation unit per row with a data
component indicating the file name, a sequence number indicating part N ( of M ) units,
and a next value indicating where the next unit resides. Once loaded and displayed the
simulator will allow a basic defragmentation to be done, attempting to group files into
adjacent allocation blocks.
Program Specification
Your project will require use of the CDrawer.
You will need to define a structure to represent file allocation units, comprised of :
• a string - representing the filename ( it will be one character for our simulation )
• an integer - representing the sequence number of this allocation unit
• an integer - representing the allocation unit of the next part of the file.
Assumptions :
A next value of -1 indicates that this allocation unit is empty
A next value of -2 indicates that this is the last allocation unit of this file
Any file system load will always have > 0 empty units
Your UI will have 3 buttons :
[Load FileSystem]
[Verify FileSystem]
[Defragment] / Toggling to disable defragmentation
And a listbox for status output – population should always use insert so newest additions
are first.
Part I - Load FileSystem
Your application will be allowed to create class level members for the following :
• List of File Allocation Units ( structure )
• CDrawer
• integer representing CDrawer File Allocation Scale ( not CDrawer scale )
• constant integer representing the maximum width for the CDrawer in pixels = 1000
Bind your [Load FileSystem] click event to a method in your form constructor.
[Load FileSystem]
Dynamically create an OpenFileDialog, and using System.IO.Path.GetFullPath and the
appropriate Environment variable, set the Initial directory to the root source ( this will allow
easy loading of the test files in your project ). Using System.IO.File.ReadAllLines(), read the
user selected file in.
For each line read, you may use split() to separate the 3 expected elements to be
processed. Process as required to make and add a structure entry to your List for each.
Upon completion, add a status line in the form : “Load FileSystem: Loaded N units”
Now that the load is complete, it needs to be displayed in the CDrawer. We want our
displayed grid to be square – in number ( ie. 6 x 6 ). Given the load number, determine the
smallest dimension that can be used. The “scale” is the file unit cell height, it will be 4
times wider than tall to fit our output requirements. Given the fixed CDrawer width,
determine the “scale”, and close any existing CDrawer before allocating a new CDrawer of
our calc.
28- Which of the following infectious agents has the smallest genome s.docxHarryyQZColemane
28. Which of the following infectious agents has the smallest genome size of any self-replicating biological system (and does not code for even one single protein)? A. the double-stranded DNA viruses B. the single-stranded RNA viruses C. the single-stranded RNA viroids D. the single-stranded DNA viruses E. the double-stranded RNA viruses
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2-4 Jomens Ltd also owns shares in other listed companies- such as Mic.docxHarryyQZColemane
2.4 Jomens Ltd also owns shares in other listed companies, such as Microsoft and MTN. Suppose Jomens has asked you to manage their large share portfolio. You would like to buy and/or sell options on many of the shares they owns. Describe the types of options you would buy or sell, as well as your rationale, given the following circumstances: a. Jomens Ltd owns 10 000 Microsoft shares. You believe it is going to fall in price, but they won't let you sell it because the late founder told them never to let it go. How do you protect Jomens Ltd from the impending price decline? (4 marks) b. Your analysis suggests that the ordinary shares of MTN is poised to increase in value sharply over the next year. Jomens Ltd doesn't want to buy any of the shares, but they want you to use options to profit if the price rises. What do you do? (4 marks) 2.5 Why do you think the most actively traded options tend to be the ones that are near the money? (3 marks) 2.6 Briefly distinguish between American option and European Option. (3 marks)
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June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...Levi Shapiro
Letter from the Congress of the United States regarding Anti-Semitism sent June 3rd to MIT President Sally Kornbluth, MIT Corp Chair, Mark Gorenberg
Dear Dr. Kornbluth and Mr. Gorenberg,
The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
harassment and intimidation at the Massachusetts Institute of Technology (MIT). Failing to act decisively to ensure a safe learning environment for all students would be a grave dereliction of your responsibilities as President of MIT and Chair of the MIT Corporation.
This Congress will not stand idly by and allow an environment hostile to Jewish students to persist. The House believes that your institution is in violation of Title VI of the Civil Rights Act, and the inability or
unwillingness to rectify this violation through action requires accountability.
Postsecondary education is a unique opportunity for students to learn and have their ideas and beliefs challenged. However, universities receiving hundreds of millions of federal funds annually have denied
students that opportunity and have been hijacked to become venues for the promotion of terrorism, antisemitic harassment and intimidation, unlawful encampments, and in some cases, assaults and riots.
The House of Representatives will not countenance the use of federal funds to indoctrinate students into hateful, antisemitic, anti-American supporters of terrorism. Investigations into campus antisemitism by the Committee on Education and the Workforce and the Committee on Ways and Means have been expanded into a Congress-wide probe across all relevant jurisdictions to address this national crisis. The undersigned Committees will conduct oversight into the use of federal funds at MIT and its learning environment under authorities granted to each Committee.
• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
• The Committee on Oversight and Accountability is investigating the sources of funding and other support flowing to groups espousing pro-Hamas propaganda and engaged in antisemitic harassment and intimidation of students. The Committee on Oversight and Accountability is the principal oversight committee of the US House of Representatives and has broad authority to investigate “any matter” at “any time” under House Rule X.
• The Committee on Ways and Means has been investigating several universities since November 15, 2023, when the Committee held a hearing entitled From Ivory Towers to Dark Corners: Investigating the Nexus Between Antisemitism, Tax-Exempt Universities, and Terror Financing. The Committee followed the hearing with letters to those institutions on January 10, 202
Instructions for Submissions thorugh G- Classroom.pptxJheel Barad
This presentation provides a briefing on how to upload submissions and documents in Google Classroom. It was prepared as part of an orientation for new Sainik School in-service teacher trainees. As a training officer, my goal is to ensure that you are comfortable and proficient with this essential tool for managing assignments and fostering student engagement.
Synthetic Fiber Construction in lab .pptxPavel ( NSTU)
Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
Introduction to AI for Nonprofits with Tapp NetworkTechSoup
Dive into the world of AI! Experts Jon Hill and Tareq Monaur will guide you through AI's role in enhancing nonprofit websites and basic marketing strategies, making it easy to understand and apply.
Embracing GenAI - A Strategic ImperativePeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
Model Attribute Check Company Auto PropertyCeline George
In Odoo, the multi-company feature allows you to manage multiple companies within a single Odoo database instance. Each company can have its own configurations while still sharing common resources such as products, customers, and suppliers.
Macroeconomics- Movie Location
This will be used as part of your Personal Professional Portfolio once graded.
Objective:
Prepare a presentation or a paper using research, basic comparative analysis, data organization and application of economic information. You will make an informed assessment of an economic climate outside of the United States to accomplish an entertainment industry objective.
The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
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The French Revolution Class 9 Study Material pdf free download
37-11 File Random Access In this program you will use RandomAccessFile.docx
1. 37.11 File Random Access
In this program you will use RandomAccessFile to read and write a binary file (Binary.dat).
Step 1) Create a RandomAccessFile object for the Binary.dat file. Use the 'rws' tag to ensure that
changes happen immediately. Create a ArrayList of type Long as well.
Stepl 2) The data in Binary.dat is organized logically as sets of triples: a price (double, 8 bytes),
an amount (int, 4 bytes), and a description (UTF string, indefinite). Use the readDouble(),
readInt(), and readUTF() methods of RandomAccessFile to read these triples until the end of the
file is reached. The most straightforward way to do this is to get the length of Binary.dat ( use
the length() method of RandomAccessFile ) before the loop and then repeat the loop as long as
the current position ( use getFilePointer() of RandAccessFile to get this ) is less than the file
length. After you read each triple, display the values on a line separate by a space and also save
the current file position on the ArrayList (use the RandomAccessFile method getFilePointer() to
get the current file position). You program should display the following:
Submit your code to pass Test 1.
Step 3)
Write a loop that goes through the Binary.dat file and increases all of the prices by 5%. You will
need to use the seek() and writeDoublle() of RandomAccessFile. The values that you saved in
the ArrayList will be helpful. Submit your code. to pass Test 2.
import java.io.*;
import java.util.*;
public class FileRandomAccess {
public static void main(String [] args) {
/* Replace this comment with your code. */
}
}
![37.11 File Random Access
In this program you will use RandomAccessFile to read and write a binary file (Binary.dat).
Step 1) Create a RandomAccessFile object for the Binary.dat file. Use the 'rws' tag to ensure that
changes happen immediately. Create a ArrayList of type Long as well.
Stepl 2) The data in Binary.dat is organized logically as sets of triples: a price (double, 8 bytes),
an amount (int, 4 bytes), and a description (UTF string, indefinite). Use the readDouble(),
readInt(), and readUTF() methods of RandomAccessFile to read these triples until the end of the
file is reached. The most straightforward way to do this is to get the length of Binary.dat ( use
the length() method of RandomAccessFile ) before the loop and then repeat the loop as long as
the current position ( use getFilePointer() of RandAccessFile to get this ) is less than the file
length. After you read each triple, display the values on a line separate by a space and also save
the current file position on the ArrayList (use the RandomAccessFile method getFilePointer() to
get the current file position). You program should display the following:
Submit your code to pass Test 1.
Step 3)
Write a loop that goes through the Binary.dat file and increases all of the prices by 5%. You will
need to use the seek() and writeDoublle() of RandomAccessFile. The values that you saved in
the ArrayList will be helpful. Submit your code. to pass Test 2.
import java.io.*;
import java.util.*;
public class FileRandomAccess {
public static void main(String [] args) {
/* Replace this comment with your code. */
}
}](https://image.slidesharecdn.com/37-11filerandomaccessinthisprogramyouwilluserandomaccessfile-230223151640-f4e6b06a/85/37-11-File-Random-Access-In-this-program-you-will-use-RandomAccessFile-docx-1-320.jpg)
