import com.opencsv.CSVReader;
import com.opencsv.CSVReaderBuilder;
import java.io.*;
import java.util.*;
public class Devices {
    public static void main(String[] args) {
        // CSVReader();   //this works just fine

        linear(); //not working
    }

    static void CSVReader() {
        System.out.println("Here are all the devices: ");
        CSVReader reader = null;
            try {
                FileReader filereader = new FileReader("devices.csv");
                CSVReader csvReader = new CSVReaderBuilder(filereader)
                          .build();
                List<String[]> lines = csvReader.readAll();
                for (int i = 0; i < lines.size(); i++) {
                        String[] lineContents = lines.get(i);
                        System.out.println(lineContents[7]);
                }
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                if (reader != null) {
                        try {
                                reader.close();
                        } catch (IOException e) {
                                e.printStackTrace();
                        }
                }
           }
        }


    public static <T extends Comparable<T>> boolean linearSearch(T[] data, int min, int max, T target){
        int index = min;
        boolean found = false;

        while (!found && index <= max){
            found = data[index].equals(target);
            index++;
        }
        return found;
    }

    static void linear() {
        System.out.println("Device found with searching method: ");
        String d = "Samsung Galaxy S10 5G";
        CSVReader reader = null;
            try {
                FileReader filereader = new FileReader("devices.csv");
                CSVReader csvReader = new CSVReaderBuilder(filereader)
                          .build();
                List<String[]> lines = csvReader.readAll();
                for (int i = 0; i < lines.size(); i++) {
                        String[] lineContents = lines.get(i);
                        System.out.println(lineContents[7]);
                        linearSearch(lines, 1, lines.length, d);
                }
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                if (reader != null) {
                        try {
                                reader.close();
                        } catch (IOException e) {
                                e.printStackTrace();
                        }
                }
           }
        }
}

What device are you interested on?
Samsung Galaxy S10 5G
Here is its informaiton
1000 Dollars, 256 GB, Released in 2019. Snapdragon 855,....