Can someone please remove the exceptions and buffers from th

Can someone please remove the exceptions and buffers from this code? I am trying to do it but I am running into errors that I cannot get past. The majority of the code needs to stay the same.

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Scanner;

public class CalcWeightedAvgDropLowest{
   public static void main(String arg[]) throws IOException{
      
       ArrayList inputValues = getData();
       System.out.println(\"Input Valules :\"+inputValues);
       double weightedAvg = calcWeightedAvg(inputValues);
       printResults(inputValues, weightedAvg);
      
   }
   public static ArrayList getData() {
       File file=new File(\"D:\\\\data.txt\");
       ArrayList<Double> data = new ArrayList<Double>();
       if(file.exists()){
          
          
           try (BufferedReader br = new BufferedReader(new FileReader(file)))
           {
           String sCurrentLine;
           String values[] = null;
           while ((sCurrentLine = br.readLine()) != null) {
               values = sCurrentLine.split(\" \");
           }
           for(int i=0; i<values.length; i++)
           data.add(Double.parseDouble(values[i]));
           }
           catch(IOException e){
               e.printStackTrace();
           }
           }
       else{
           System.out.println(\"File does not exist\");
       }
       return data;
   }
   public static double calcWeightedAvg(ArrayList list){
       double enteredWeight = Double.parseDouble(list.get(0).toString());
       int numberofLowetValuesDropped =(int) Double.parseDouble(list.get(1).toString());
       list.remove(1);
       list.remove(0);
       Collections.sort(list);
       double total = 0;
       for(int i=numberofLowetValuesDropped; i<list.size(); i++){
           total = total + Double.parseDouble(list.get(i).toString());
       }
       list.add(0, enteredWeight);
       list.add(1, numberofLowetValuesDropped);
       double avg = total/(list.size() - numberofLowetValuesDropped);
       return avg;
   }
   public static void printResults(ArrayList list, double weight) {
       Scanner scan = new Scanner(System.in);
       System.out.println(\"Enter the output file:\");
       String outputfile = scan.next();
       try (FileWriter fw = new FileWriter(new File(outputfile)))
       {
      
       String s = \"The weighted average of the numbers is \"+weight+\", \" +
       \"when using the data \"+list+\", where \"+list.get(0)+\" is the weight used, \" +
       \"and the average is computed after dropping the lowest \"+list.get(1)+\" values.\";
       System.out.println(s);
       fw.write(s);
       fw.flush();
       fw.close();
       System.out.println(\"Data has been written into output file\");
       }
       catch(IOException e){
           e.printStackTrace();
       }
   }
}

Solution

Hi, I have removed TRY CATCH block from your code.

I have not removed Buffred Reader/Writer, because you have not mentioned that with what code you want to replace Buffered/FIleWriter.

Please let me know in case of any issue.

import java.io.BufferedReader;

import java.io.File;

import java.io.FileReader;

import java.io.FileWriter;

import java.io.IOException;

import java.util.ArrayList;

import java.util.Collections;

import java.util.Scanner;

public class CalcWeightedAvgDropLowest{

   public static void main(String arg[]) throws IOException{

       ArrayList inputValues = getData();

       System.out.println(\"Input Valules :\"+inputValues);

       double weightedAvg = calcWeightedAvg(inputValues);

       printResults(inputValues, weightedAvg);

   }

   public static ArrayList getData() throws IOException {

       File file=new File(\"D:\\\\data.txt\");

       ArrayList<Double> data = new ArrayList<Double>();

       if(file.exists()){

           BufferedReader br = new BufferedReader(new FileReader(file));

           String sCurrentLine;

           String values[] = null;

           while ((sCurrentLine = br.readLine()) != null) {

               values = sCurrentLine.split(\" \");

           }

           for(int i=0; i<values.length; i++)

               data.add(Double.parseDouble(values[i]));

       }

       else{

           System.out.println(\"File does not exist\");

       }

       return data;

   }

   public static double calcWeightedAvg(ArrayList list){

       double enteredWeight = Double.parseDouble(list.get(0).toString());

       int numberofLowetValuesDropped =(int) Double.parseDouble(list.get(1).toString());

       list.remove(1);

       list.remove(0);

       Collections.sort(list);

       double total = 0;

       for(int i=numberofLowetValuesDropped; i<list.size(); i++){

           total = total + Double.parseDouble(list.get(i).toString());

       }

       list.add(0, enteredWeight);

       list.add(1, numberofLowetValuesDropped);

       double avg = total/(list.size() - numberofLowetValuesDropped);

       return avg;

   }

   public static void printResults(ArrayList list, double weight) throws IOException {

       Scanner scan = new Scanner(System.in);

       System.out.println(\"Enter the output file:\");

       String outputfile = scan.next();

       FileWriter fw = new FileWriter(new File(outputfile));

       String s = \"The weighted average of the numbers is \"+weight+\", \" +

               \"when using the data \"+list+\", where \"+list.get(0)+\" is the weight used, \" +

               \"and the average is computed after dropping the lowest \"+list.get(1)+\" values.\";

       System.out.println(s);

       fw.write(s);

       fw.flush();

       fw.close();

       System.out.println(\"Data has been written into output file\");

   }

}