Question

in java

H1, H2, H3, Examl, Exam2 , Exam3 100,100,98,98, 70,87 98,70,87,100,100,98 100, 100, 98,70,87,98

Answer 1

import java.util.*;

import java.io.BufferedReader;

import java.io.FileNotFoundException;

import java.io.FileReader;

import java.io.IOException;

public class pgm4

{

    public static void main(String[] args) {

        BufferedReader br = null;

        String line = "";

        //reading filename

        Scanner scanner = new Scanner(System.in);

        System.out.println("Enter filename : ");

        String filename = scanner.next();

        String[] headers = new String[100]; // to save header fields

        String[][] data = new String[100][100]; //to save data fields

        int row_len = 0;

        int col_len = 0;

        Boolean isFirstRow = true;

        //reading file and saving to array

        try {

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

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

                // use comma as separator

                String[] row = line.split(",");

                if (isFirstRow){

                    //save header fields => first line

                    headers = row;

                    isFirstRow = false;

                    col_len = headers.length;

                }

                else{

                    //rest line is data values

                    data[row_len] = row;

                    row_len++;

                }

            }

        } catch (FileNotFoundException e) {

            e.printStackTrace();

        } catch (IOException e) {

            e.printStackTrace();

        } finally {

            //closing file pointer

            if (br != null) {

                try {

                    br.close();

                } catch (IOException e) {

                    e.printStackTrace();

                }

            }

        }

        //reading colum name

        System.out.println("Enter column name : ");

        String column = scanner.next();

        int col_index = 0;

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

            //to find column index of entered column

            if(headers[i].equals(column))

            {

                col_index = i;

                break;

            }

         }

        //print all the data fields in column index

        for(int i=0;i<row_len;++i){

            System.out.println(data[i][col_index]);

        }

        

        for (int i=0; i<row_len; ++i){

            //iterate through each row

            int big_index = 0;

            int big = 0;

            for(int j=0; j<col_len; ++j){

                int val = Integer.parseInt(data[i][j]);

                //find biggest value in each row

                if (val>big){

                    //save the index of the biggest column

                    big = val;

                    big_index = j;

                }

            }

            //display the result

            System.out.println("column "+headers[big_index]+ " is larger : "+big);

        }

    }

}

INPUT AND OUTPUT
Enter filename :
class.txt
Enter column name :
exam1
64
6
34
column h1 is larger : 100
column h3 is larger : 98
column h1 is larger : 98

DATASET(class.txt)

h1,h2,h3,exam1,exam2,exam3
100,100,98,64,87,12
45,36,98,6,21,65
98,78,56,34,67,48

The option for uploading images is not working, so I can't upload screenshots. sorry. But the code will work fine as java doesn't need any indentation. Just copy paste in your pc and run.