Java-CSV-API

• CSV sample program is implemented inside the CSV_Read_Sample folder
• The Java program that reads a *.csv file and displays its contents in a tabular format.

CSV (Comma Separated Values) sample Java api

• Java program reads a *.csv file and prints its contents to the console. It utilizes Java's standard I/O classes to perform file operations and exception handling to handle potential errors.

• Sample data: testData.csv

• Java api reads the file then outputs the data

• CSV_Read_Sample.java explanation:

  • The code declares a class named Test within the package org.example.

  • The main method serves as the entry point of the program.

  • The code defines a file path variable (file) that points to the location of the CSV file to be read.

  • It initializes a BufferedReader object (reader) as null. This object will be used to read the file.

  • Inside a try block, the code creates a BufferedReader by passing a FileReader object (initialized with the file path) to it. This establishes a connection to the file for reading.

  • The code enters a loop that reads each line of the file using reader.readLine() until the end of the file is reached (i.e., the returned line is null).

  • Within the loop, each line is split into an array of strings using a comma (,) as the delimiter. The resulting array is stored in the row variable.

  • Another loop iterates over each element in the row array and prints it to the console using System.out.printf(). The %-20s formatting ensures left alignment and a minimum width of 20 characters for each printed value.

  • After printing all values in a row, a newline character is printed using System.out.println() to move to the next line.

  • If an exception occurs during file reading or printing, it is caught in the catch block, and the exception stack trace is printed to the console using e.printStackTrace().

  • Finally, the finally block ensures that the BufferedReader object is properly closed using the close() method. If an exception occurs while closing the reader, a RuntimeException is thrown with the original exception as its cause.

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Vector-Search

• Vector Search program is implemented in the following folder: Vector_Search_Sample
• The Java program that allows the user to search for a keyword in a *.csv file. The program prompts the user to enter a keyword, reads the input, and then opens a CSV file specified by the file path. It reads the file line by line and checks if each line contains the keyword. If a match is found, it prints the row index and the entire line. Finally, it closes the file and handles any exceptions that may occur during the file reading process.
• Overall, this code demonstrates a simple file handling operation in Java, where a *.csv file is read, and a keyword search is performed on its contents.

Vector Search Sample

• Java code allows the user to search for a keyword within a CSV file. It utilizes Java's standard I/O classes, exception handling, and user input functionality to achieve this task.

• Test Data is NationalUniversitiesRankings.csv

• Java API reads the file then searchs for the particular keyword

• Vector Search is implemented in the below lines (This loop is performing the vector search by comparing each element in the row to the keyword entered by the user. If a match is found, it prints the entire row where the keyword was found.):

• Vector_Search_Sample.java code explanation:

  • Code starts by importing necessary classes for file handling, exception handling, and user input.

  • The code declares a class named Test within the package org.example.

  • The main method serves as the entry point of the program.

  • The code defines a file path variable (file) that points to the location of the CSV file to be read.

  • It initializes a BufferedReader object (reader) as null. This object will be used to read the file.

  • It declares a string variable (line) to store each line read from the file.

  • It declares an integer variable (rowIndex) to keep track of the current row being read.

  • It initializes a Scanner object (input) to receive user input from the console.

  • The code prompts the user to enter a keyword to search within the CSV file using System.out.print().

  • It reads the user's input (keyword) using input.nextLine() and stores it in a string variable (keyword).

  • Inside a try block, the code creates a BufferedReader by passing a FileReader object (initialized with the file path) to it. This establishes a connection to the file for reading.

  • The code enters a loop that reads each line of the file using reader.readLine() until the end of the file is reached (i.e., the returned line is null).

  • Within the loop, each line is split into an array of strings using a comma (,) as the delimiter. The resulting array is stored in the row variable.

  • Another loop iterates over each element in the row array and checks if the current element contains the keyword entered by the user using index.contains(keyword).

  • If a match is found, the code prints the row index (rowIndex) and the entire line where the keyword was found using System.out.println().

  • After processing each line, the rowIndex is incremented.

  • If an exception occurs during file reading, searching, or printing, it is caught in the catch block, and the exception stack trace is printed to the console using e.printStackTrace().

  • Finally, the finally block ensures that the BufferedReader object is properly closed using the close() method. If an exception occurs while closing the reader, a RuntimeException is thrown with the original exception as its cause.