cs272/EmployeeFileOp.java at master · ryleedavis/cs272 · GitHub

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//Rylee Davis
//cs272
//Lab1 EmployeFileOp.java
//August 28, 2019

package myprograms;

import java.io.*;

class EmployeeInformation
{
	 String name;
	 int number;
	 String state;
	 int zip;
	 int age;
	 String sex;

	//ageGetter or isLessThan30 function

	//Get CSVString
}

public class EmployeeFileOp
{
	private static EmployeeInformation[] numEmployees = null;
//	public int getAge()
//	{
//		return age;
//	}//end getAge()


		public static void read(String fname) //function read
		{
			int no = 0;
			String line = "";
			try
			{
	            // FileReader reads text files in the default encoding.
	            FileReader fileReader = new FileReader(fname);

	            // Always wrap FileReader in BufferedReader.
	            BufferedReader bufferedReader = new BufferedReader(fileReader);

	            String input;
	            int counter = 0;

	            while((input = bufferedReader.readLine()) != null)
	            {
	            	counter++;

	            }//end while

	            System.out.println("Count: " + counter);

	            while((line = bufferedReader.readLine()) != null) //will read until end ?
	            {
	                //parse line
	                if(no==0)
	                {
	                	int totalNumber = Integer.parseInt(line);
	                	numEmployees = new EmployeeInformation[totalNumber];
	                }//end if

	                else
	                {
	                	String[] linestr = line.split(","); //use comma as separator
	                	if(linestr.length!= 6) continue;

	                	if(no > numEmployees.length)
	                	{
	                		System.out.println("There are too many employees in the file. ");
	                			break;
	                	}//end if

	                	numEmployees[no-1] = new EmployeeInformation();
	                	numEmployees[no-1].name = linestr[0];
	                	numEmployees[no-1].number = Integer.parseInt(linestr[1]);
	                	numEmployees[no-1].state = linestr[2];
	                	numEmployees[no-1].zip = Integer.parseInt(linestr[3]);
	                	numEmployees[no-1].age = Integer.parseInt(linestr[4]);
	                	numEmployees[no-1].sex = linestr[5];

	                }//end else

	              }//end while

	                no++;

	             bufferedReader.close(); // Always close files.
	            }//end try
			catch(FileNotFoundException ex)
			{
	            System.out.println("Unable to open file '" +  fname + "'");
	        }//end catch

	        catch(IOException ex)
	        {
	            System.out.println("Error reading file '" + fname + "'");
	        }//end catch

			System.out.println("Finish reading pairs from file "+ fname);

		}//end read

			public static void write(String fname)
			{
//				if( <= 30)
				try
				{
					File file = new File(fname);

					FileWriter fw = new FileWriter(file.getAbsoluteFile());
					BufferedWriter bw = new BufferedWriter(fw);

					bw.write(numEmployees.length + "\n");

					for(int i =  0;i < numEmployees.length;i++)
					{
						//System.out.println("i = " + i + ":" + numEmployees[i].name+ "," + numEmployees[i].number...);
						bw.write(numEmployees[i].name + "," + numEmployees[i].number + "," + numEmployees[i].state + "," + numEmployees[i].zip + "," + numEmployees[i].age + "," + numEmployees[i].sex + "\n" );

					}//end for

					//close the writers
					if(bw != null)
						bw.close();
					if(fw != null)
						fw.close();


//					bw.close();
//					fw.close();


				}//end try
				catch (IOException e)
				{
					e.printStackTrace();
				}//end catch

				System.out.println("Finish writing pairs to file "+ fname);
			}//end write

			public static void main(String[] args)
			{
				numEmployees = null;		//clear the memory
				read("core_dataset.csv");		//read back the 100 pairs
				write("young_employee.csv"); //write the pairs to another file
			}//end main

}//end class