Explain the Java dice game.

I'm writing a program in Java, a game called Pig. The rules are: There are two players. Each take turn to roll a 6-sided die; a player repeatedly rolls it until the player chooses to stop rolling and pass the dice to the other player, and add the sum of previous rolls to their points, or the player rolls a 1 during their turn, which all of their previous rolls are discarded and their turn ends immediately. The first to reach 100 points wins. I've finished the code, tried to make it as robust as possible, and ended up with this:

import static java.lang.System.*;

import java.util.*;

public class PigDiceGame {

public static Scanner scan = new Scanner (in);

public static Random generator = new Random ();

public static int p1Score = 0;

public static int p2Score = 0;

public static int counter;

public static void main(String args[]){
    out.println("Welcome to Pig, the two-player dice game!");
    out.println("Player 1 go first");
    p1 Mechanics ();
}
public static int Roll() {
    int Low = 1;
    int High = 7;
    int Roll = generator.nextInt (High - Low) + Low;
    return Roll;
}
public static void p1 Mechanics() {
    counter = 0;
    out.println("Do you want to play this turn? (Y/N)");
    String answer = scan.nextLine ();
    answer = answer.replaceAll (" ", "") ;
    answer = answer.toUpperCase ();
    if (answer.equals("N")) {
        out.println ("Player 1 skipped their turn.");
        out.println ("Player 2's turn to roll");
        p2 Mechanics ();
    }
    int Roll = Roll();
    out.println ("You rolled a " + Roll);
    while (p1 Score + counter < 100>        while (Roll != 1) {
            counter += Roll;
            out.println ("Do you want to roll more? (Y/N)");
            answer = scan.nextLine ();
            answer = answer.replaceAll (" ", "") ;
            answer = answer.toUpperCase ();
            while(!(answer.equals("Y")) && !(answer.equals("N"))){
                out.println("Please enter only Y/N:");
                answer = scan.nextLine ();
                answer = answer.replaceAll (" ", "") ;
                answer = answer.toUpperCase ();
            }
            if (answer.equals("N")) {
                p1 Score += counter;
                out.println ("Player 1 ended their turn.");
                out.println ("P1 vs P2: " + p1 Score + "-" + p Score);
                out.println ("Player 2's turn to roll");
                p2 Mechanics ();
            }
            Roll = Roll ();
            out.println ("You rolled a " + Roll);
        }
        if (Roll == 1) {
            counter = 0;
        }
        out.println ("Player 1 rolled a '1'.");
        out.println ("P1 vs P2: " + p1 Score + "-" + p Score);
        out.println ("Player 2's turn to roll");
        p2 Mechanics ();
    }
    out.println("Player 1's score reached 100!");
    out.println("P1 wins by " + (p1 Score - p Score) + " points!");
    exit (0);
}
public static void p2 Mechanics() {
    counter = 0;
    out.println("Do you want to play this turn? (Y/N)");
    String answer = scan.nextLine ();
    answer = answer.replaceAll (" ", "") ;
    answer = answer.toUpperCase ();
    if (answer.equals("N")) {
        out.println ("Player 2 skipped their turn.");
        out.println ("Player 1's turn to roll");
        p1 Mechanics ();
    }
    int Roll = Roll();
    out.println ("You rolled a " + Roll);
    maxScore: while (p2 Score < 100>        while (Roll != 1) {
            counter += Roll;
            out.println ("Do you want to roll more? (Y/N)");
            answer = scan.nextLine ();
            answer = answer.replaceAll (" ", "") ;
            answer = answer.toUpperCase ();
            while(!(answer.equals("Y")) && !(answer.equals("N"))){
                out.println("Please enter only Y/N:");
                answer = scan.nextLine ();
                answer = answer.replaceAll (" ", "") ;
                answer = answer.toUpperCase ();
            }
            if (answer.equals("N")) {
                p2 Score += counter;
                out.println ("Player 2 ended their turn.");
                out.println ("P1 vs P2: " + p1 Score + "-" + p Score);
                out.println ("Player 1's turn to roll");
                p1 Mechanics ();
            }
            Roll = Roll ();
            out.println ("You rolled a " + Roll);
        }
        if (Roll == 1) {
            counter = 0;
        }
        out.println ("Player 2 rolled a '1'.");
        out.println ("P1 vs P2: " + p1 Score + "-" + p Score);
        out.println ("Player 1's turn to roll");
        p1 Mechanics ();
    }
    out.println("Player 2's score reached 100!");
    out.println("P2 wins by " + (p2Score - p1Score) + " points!");
    exit (0);
}
}

I've run this code twice and swapped back and forth between two player's turns and it works correctly. I haven't had time to play a full game, though. I am looking for ways that I can improve the existing code. I never came up with any procedural decomposition before writing it so it's more like patching holes one by one. It may function, but it could probably be improved. Any help would be appreciated. I've been learning Java for a while now and really need some "expert" opinions.