If function using user input

Question

I am working on a project for Uni that involves a program reading a .txt file with information regarding cryptos.

I am currently stuck on the lookupBalance() section. My goal is to have a user input which crypto they would like to see the balance of, and use that input to provide them a balance of that crypto. I have tried tons of different things and cant seem to get it right. For example, if the user inputs "BTC", I want the program to provide "1.3426".

My .txt file contains what is in the attached .png enter image description here

public class Main {
static Scanner userInputInt = new Scanner(System.in);
static Scanner userInputString = new Scanner(System.in);
static Scanner userInputDouble = new Scanner(System.in);

public static void main(String[] args) {
    int userChoice = getUserChoice();
    switch (userChoice) {
        case 1:
            viewWallet();
            break;
         case 2:
            lookupBalance();
            break;
    }
}

// This method asks and returns what the user wants to do
public static int getUserChoice() {
    System.out.println("****************************************************************");
    System.out.println("****************************************************************");
    System.out.println("************ Crypto Wallet **********");
    System.out.println("****************************************************************");
    System.out.println("****************************************************************");
    System.out.println("");
    System.out.println("What do you want to do?");
    System.out.println("(1) View wallet");
    System.out.println("(2) Look up the balance of a given crypto");
    System.out.println("(3) Add new cryptos");
    System.out.println("(4) Remove an existing crypto");
    System.out.println("(5) Update wallet");
    System.out.println("****************************************************************");
    System.out.print("Please enter your choice (1, 2, 3, 4, or 5): ");
    return userInputInt.nextInt();
}

// This method is called for user choice 1
public static void viewWallet() {
    String[] cryptoName = readCryptoNames();
    double[] cryptoBalance = readCryptoBalance();
    System.out.println("Crypto in portfolio " + Arrays.toString(cryptoName) + " Balance of crypto " +  Arrays.toString(readCryptoBalance()));
    }

// This method is called for user choice 2
public static void lookupBalance() {
    String[] cryptoName = readCryptoNames();
    double[] cryptoBalance = readCryptoBalance();
    Arrays.toString(cryptoName);
    System.out.println(Arrays.toString(cryptoName));
    String[] line = new String[cryptoName.length];
    int BTC = (int) 1.3426;
    int ETH = (int) 5.2519;
    int XRP = (int) 158.5000;

   System.out.println("Which crypto would you like to view the balance of? ");
    String cryptoNameTBF = userInputString.next();

    if (cryptoNameTBF == BTC)
        System.out.println("1.3426");//example of what I want as an output
    }


// This method reads and returns the crypto names from the file
 public static String[] readCryptoNames() {

   String[] temp = new String[100];
   int lineNumber = 0;
   try {

       BufferedReader myFile = new BufferedReader(new FileReader("C:\\Users\\John\\IdeaProjects\\A3_591158\\src\\com\\company\\wallet.txt"));
       String sCurrentLine;
       while ((sCurrentLine = myFile.readLine()) != null) {
           String[] tokens = sCurrentLine.split("\\s+");
           temp[lineNumber] = (tokens[0]);
           lineNumber++;
       }
       myFile.close();
   } catch (IOException e) {
       System.out.println("Error reading crypto name: " + e.getMessage());
   }
   String[] cryptoName = new String[lineNumber];
   System.arraycopy(temp, 0, cryptoName, 0, lineNumber);
   System.out.println(cryptoName);
   return cryptoName;
}

// This method reads and returns the crypto balances from the file
public static double[] readCryptoBalance() {
    double[] temp = new double[100];
    int lineNumber = 0;
    try {

        BufferedReader myFile = new BufferedReader(new FileReader("C:\\Users\\John\\IdeaProjects\\A3_591158\\src\\com\\company\\wallet.txt"));
        String sCurrentLine;
        while ((sCurrentLine = myFile.readLine()) != null) {
            String[] tokens = sCurrentLine.split("\\s+");
            temp[lineNumber] = Double.parseDouble(tokens[1]);
            lineNumber++;
        }
        myFile.close();
    } catch (IOException e) {
        System.out.println("Error reading crypto balance: " + e.getMessage());
    }
    double[] cryptoBalance = new double[lineNumber];
    System.arraycopy(temp, 0, cryptoBalance, 0, lineNumber);
    return cryptoBalance;
}