Read CSV file and Display salary between from date and to date

Step 1>

package com.kartik.file;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Scanner;

public class ReadCVS {

public static void main(String[] args) throws FileNotFoundException,
   IOException {

ReadCVS obj = new ReadCVS();
obj.run();
}

public void run() throws FileNotFoundException, IOException {
Scanner scanner = new Scanner(new File("D:\\Kartik\\employee.csv"));
Scanner dataScanner = null;
int index = 0;
List<Employee> empList = new ArrayList<Employee>();
while (scanner.hasNextLine()) {
   dataScanner = new Scanner(scanner.nextLine());
   dataScanner.useDelimiter(",");
   Employee emp = new Employee();

   while (dataScanner.hasNext()) {
    String data = dataScanner.next();
    if (index == 0)
     emp.setId(Integer.parseInt(data));
    else if (index == 1)
     emp.setName(data);
    else if (index == 2)
     emp.setRole(data);
    else if (index == 3)
     emp.setSalary(data);
    else if (index == 4)
     emp.setDate(stringDateToDateConvert(data));
    else
     System.out.println("invalid data::" + data);
    index++;
   }
   index = 0;
   empList.add(emp);
}
DateFormat df = new SimpleDateFormat("yyyy-MM-dd");
Date fromDate = stringDateToDateConvert("2014-01-20");
Date toDate = stringDateToDateConvert("2015-12-20");
List<Employee> empObjList = new ArrayList<Employee>();
for (Employee employee : empList) {
   if (compareDatesByCompareTo(df, fromDate, toDate,
     employee.getDate())) {
    Employee empObj = new Employee();
    empObj.setDate(employee.getDate());
    empObj.setId(employee.getId());
    empObj.setName(employee.getName());
    empObj.setSalary(employee.getSalary());
    empObjList.add(empObj);
   }
   System.out.println(employee.getName());
}
int totalSal = 0;

for (Employee employee : empObjList) {

String salary = employee.getSalary().split(" ")[0]; // Extracting only the numeric part

totalSal += Integer.parseInt(salary);

System.out.println("Employee Name --> " + employee.getName());

}

System.out.println("Total Salary: " + totalSal);

System.out.println("Employee Name-->" + employee.getName());
}
System.out.println("Total Sal " + totalSal);
}

/**
  *
  * @param df
  * @param oldDate
  * @param newDate
  * @param currentDate
  * @return
  */
public static boolean compareDatesByCompareTo(DateFormat df, Date oldDate,
   Date newDate, Date currentDate) {
   return (currentDate.compareTo(fromDate) >= 0 && currentDate.compareTo(toDate) <= 0);

}

/**
  *
  * @param date
  * @return
  */
public Date stringDateToDateConvert(String date) {
Date convertedDate = null;
DateFormat formatter = null;
// Creating SimpleDateFormat with yyyy-MM-dd format e.g."2011-09-14"
// String yyyyMMdd = "20110914";
formatter = new SimpleDateFormat("yyyy-MM-dd");
try {
   convertedDate = (Date) formatter.parse(date);
} catch (ParseException e) {
   e.printStackTrace();
}
return convertedDate;
}
}

Step 2>

package com.kartik.file;

import java.util.Date;

public class Employee {

private int id;
private String name;
private String role;
private String salary;
private Date date;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getRole() {
return role;
}
public void setRole(String role) {
this.role = role;
}
public String getSalary() {
return salary;
}
public void setSalary(String salary) {
this.salary = salary;
}

/**
  * @return the date
  */
public Date getDate() {
return date;
}
/**
  * @param date the date to set
  */
public void setDate(Date date) {
this.date = date;
}

@Override
public String toString() {
return "\nID=" + getId() + "::Name" + getName() + "::Role=" + getRole()
    + "::Salary=" + getSalary() + "::Date=" + getDate();
}
}

The code you've provided is a Java program that reads a CSV file (specifically employee.csv) containing employee information such as id, name, role, salary, and date. It processes this information, converts the date strings into Date objects, filters the employees based on the date range, calculates the total salary, and then prints out the employees and the total salary.

Step-by-Step Overview of the Code:

1. Reading the CSV File:

The ReadCVS class reads the file employee.csv using a Scanner object and parses each line using a dataScanner to tokenize based on the comma delimiter.
It stores each employee's details in an Employee object, and then adds the object to a list of employees (empList).

2. Date Conversion:

The stringDateToDateConvert method is used to convert a date string (in yyyy-MM-dd format) to a Date object.

3. Filtering Employees by Date:

The program compares the employee's date of joining with a given range (fromDate to toDate). It filters employees whose joining date falls within this range and stores the filtered employees in empObjList.

4. Salary Calculation:

The program splits the salary string (which includes both the amount and the currency, e.g., "5000 USD") to extract the numeric part of the salary and adds it to a total salary sum.

5. Employee Class:

The Employee class contains fields like id, name, role, salary, and date along with their getters, setters, and a toString method for formatting the output.

Example Employee CSV Data (employee.csv):

Plain text

1,John Doe,Manager,5000 USD,2014-01-15

2,Jane Smith,Developer,4500 USD,2015-02-10

3,Bob Johnson,Designer,4000 USD,2014-03-25

Conclusion:

The provided code works for reading a CSV file, parsing employee data, filtering by date, and calculating salaries. By fixing the mentioned issues, adding better error handling, and using proper resource management, you can ensure the code is more robust and maintainable.