java - 特定のメソッドの呼び出し

Question

import java.util.Scanner;

import javax.swing.JOptionPane;

public class HW {

public static void main(String[] args){
    while (retry == true){
        getGuess();
        getBet(balance);
        checkGuess(getGuess());
        updateBal(guessResult, betParsed);
        goAgain(balance);
    }
}


public static String getGuess(){
    //Guess input
    System.out.println("Guess: (H/T");
    Scanner in = new Scanner(System.in);
    boolean validInput = false;
    String guess = null;
    while (validInput == false){
        guess = in.next(); 
        if (guess.equals("H") || guess.equals("T")){
            validInput = true;
        } else {
            JOptionPane.showMessageDialog(null, "Invalid Input: " + guess);
        }
    }
    return guess;
}

public static boolean checkGuess(String sideGuess){
    //Checks if the side is correct
    double num = Math.round(Math.random());
    boolean guessResult;
    if (num == 0 && sideGuess.equals("H")){
        System.out.println("Correct. The side was: H");
        guessResult = true;
        return true;
    } else if (num == 1 && sideGuess.equals("T")){
        System.out.println("Correct. The side was: T");
        guessResult = true;
        return true;
    } else {
        System.out.println("Incorrect.");
        guessResult = false;
        return false;
    }
}

public static double getBet(double balance){
    //Retrieves a bet from the user
    Scanner in = new Scanner(System.in);
    String betInput = null;
    double betParsed = 0;
    boolean validInput = false;
    while (validInput == false){
        betInput = in.next();
        try {
            betParsed = Double.parseDouble(betInput);
        }
        catch (NumberFormatException e) {
            JOptionPane.showMessageDialog(null, "Invlaid Input: " + betInput);
        }
        if (betParsed > balance || betParsed < 0){
            JOptionPane.showMessageDialog(null, "Invalid Input! You have: $" + balance);
        } else {
            validInput = true;
        }
    }
    return betParsed;
}

public static double updateBal(boolean checkGuess, double getBet){
    //Updates the balance based on the bet
    double balance = 0;
    if (checkGuess == true){
        balance = balance + getBet * 2;
        System.out.println("Your balance is now: $" + balance);
    } else {
        System.out.println("Your balance is now: $" + balance);
        balance = balance - getBet;
    }
    return balance;
}

public static boolean goAgain(double balance){
    //Determines if new play is needed
    Scanner in = new Scanner(System.in);
    boolean validInput = false;
    String goAgainInput = null;
    boolean retry;
    while (validInput == false){
        System.out.println("Go again? (Y/N)");
        goAgainInput = in.next();
        if (goAgainInput.equals("Y") || goAgainInput.equals("N")){
            validInput = true;          
        } else {
            JOptionPane.showMessageDialog(null, "Invalid Input: " + goAgainInput);
        }
    }
    if (goAgainInput.equals("Y")){
        retry = true;
        return true;
    } else {
        System.out.println("You ended with: $" + balance);
        retry = false;
        return false;
    }
}
}

コードを編集しました。

いくつかの定義済み変数をいくつかのメソッドに渡そうとしていますが、それらを使用できないようですか?

どうすればこれを修正できますか?

それらは「ローカル」ではないようですが、メソッドで定義されているため理解できません。私はそれを考えているに違いない。