UNIVERSITY OF WEST ATTICA
SCHOOL OF ENGINEERING
DEPARTMENT OF COMPUTER ENGINEERING AND INFORMATICS

University of West Attica · Department of Computer Engineering and Informatics

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Software Development Methodologies

Java I/O

Vasileios Evangelos Athanasiou
Student ID: 19390005

GitHub · LinkedIn

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Supervision

Supervisor: Georgios Prezerakos, Professor

UNIWA Profile · LinkedIn

Co-supervisor: Angelos Georgoulas, Assistant Professor

Scholar · LinkedIn

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Athens, April 2023

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README

Java I/O

The purpose of this exercise set is to practice core Java Input/Output (I/O) operations, file handling, and basic programming structures.
It covers reading from standard input, file manipulation (reading/writing), and exception handling.

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Table of Contents

Section	Folder/File	Description
1	INSTALL.md	Installation and execution instructions
2	README.md	Project overview and usage guide
3	assign/	Assignment description documents
3.1	assign/SDM Exercise 2 (Input & Output).pdf	Assignment description (English)
3.2	assign/ΜΑΕ Ασκήση 2 (Input & Output).pdf	Assignment description (Greek)
4	src/	Java source code projects demonstrating input/output operations
4.1	src/CopyFiles/	Java project for copying the contents of files
4.1.1	src/CopyFiles/build/	Compiled build output
4.1.2	src/CopyFiles/build.xml	Apache Ant build configuration
4.1.3	src/CopyFiles/manifest.mf	Application manifest file
4.1.4	src/CopyFiles/myfile.txt	Example input file
4.1.5	src/CopyFiles/myfile2.txt	Example output/second file
4.1.6	src/CopyFiles/nbproject/	NetBeans project configuration files
4.1.7	src/CopyFiles/src/copyfiles/	Java source code package
4.2	src/CountStatistics/	Java project that calculates statistics from file data
4.2.1	src/CountStatistics/build/	Compiled build output
4.2.2	src/CountStatistics/build.xml	Apache Ant build configuration
4.2.3	src/CountStatistics/manifest.mf	Application manifest file
4.2.4	src/CountStatistics/myfile.txt	Example input file
4.2.5	src/CountStatistics/nbproject/	NetBeans project configuration files
4.2.6	src/CountStatistics/src/countstatistics/	Java source code package
4.3	src/Fibonacci/	Java project that generates Fibonacci numbers and writes them to a file
4.3.1	src/Fibonacci/build/	Compiled build output
4.3.2	src/Fibonacci/build.xml	Apache Ant build configuration
4.3.3	src/Fibonacci/manifest.mf	Application manifest file
4.3.4	src/Fibonacci/fib50.txt	Example file containing Fibonacci numbers
4.3.5	src/Fibonacci/nbproject/	NetBeans project configuration files
4.3.6	src/Fibonacci/src/fibonacci/	Java source code package
4.4	src/ScannerExercise/	Java project demonstrating the use of the Scanner class
4.4.1	src/ScannerExercise/build/	Compiled build output
4.4.2	src/ScannerExercise/build.xml	Apache Ant build configuration
4.4.3	src/ScannerExercise/manifest.mf	Application manifest file
4.4.4	src/ScannerExercise/nbproject/	NetBeans project configuration files
4.4.5	src/ScannerExercise/src/scannerexercise/	Java source code package

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1. Key Subjects Covered

• Data Reading: Handling bytes and characters from standard input.
• File Streams: Utilizing FileStreams for read/write operations.
• Exception Handling: Managing runtime errors using try-catch blocks.
• Logic Structures: Implementing if-else and while loops.
• String & Scanner: String manipulation and using the Scanner class.

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2. Exercises Description

2.1: Student Grade Processor

Create a console program that calculates the average grade for students based on standard input.

2.1.1 Input Format

• Student registration number followed by pairs of:
  [Course Name] [Grade]

2.1.2 Termination Rules

• Enter end to finish entering grades for a specific student.
• Enter 000000 as a registration number to exit the program.

2.1.3 Output

• Prints the student registration number and their calculated average grade.

2.2: File Copy Utility

Develop a program that copies the contents of one text file to another.

2.2.1 Process

• The user provides:
  • The full path of the source file
  • The destination (copy) file path

2.2.2 Implementation Note

• Use FileWriter and FileReader wrapped in Buffered Streams for better efficiency.

2.2.3 Error Handling

• Use try-catch blocks to handle:
  • Invalid file paths
  • Missing files
  • Read/write errors

2.3: Text Statistics Analyzer

A program that reads a text file, displays its content, and calculates specific character statistics.

2.3.1 Statistics Tracked

• Greek characters:

  • Alpha (Α, α)
  • Gamma (Γ, γ)
  • Omega (Ω, ω)

• Odd digits:

  • 1, 3, 5, 7, 9

2.3.2 Implementation Tip

Use the read() method to process the file character by character.

2.4: Fibonacci Sequence to File

This program calculates the first 50 terms of the Fibonacci sequence and saves them to a text file.

2.4.1 File Format

Each term should appear on a new line:

F(0) = 0
F(1) = 1
F(2) = 1
...

2.4.2 Phase 2

Include an additional method that:

1. Reads the generated Fibonacci file.
2. Prints only the numerical values to the console.