I am trying to find a specific string in a txt file.
here is what i have using java lists:

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;


public class constantb {

    
    static String filePath = "C:myiflepath";

    public static Double findDouble(String name) throws IOException{

        String value;

        Scanner constScanner = new Scanner(filePath);

        List<String> list=new ArrayList<>();

        while(constScanner.hasNextLine()){
            list.add(constScanner.nextLine()); 
        }


        value = list.get(list.indexOf(name)+1);
        System.out.println(value);
        
        constScanner.close();
        return Double.parseDouble(value);

    }
}

When I run this I get a number format exception problem.
In the txt file it searches for a name and right below that name in the file is what I want to return as a double.
here is the txt file:

help please:
double hi
9

I have tried removing the list part of the file:

import java.util.Scanner;

public class constantc{

    static String filePath = "C:myfilepath";

    public static Double findDouble(String name){
        Scanner scanner = new Scanner(filePath);
        String value = scanner.nextLine();
        while(scanner.hasNextLine()){
            value = scanner.nextLine();
            if(name == scanner.nextLine()){
                scanner.nextLine();
                value = scanner.nextLine();
                break;
            }else{
                scanner.nextLine();
            }
        }
        scanner.close();
        return Double.parseDouble(value);
    }
}

That did not work because I got the same error.