Операции над матрицей для перечисления всех путей через n-partite график

Я сделал небольшие изменения в вашем коде. Попробуйте это:

package stack;

import java.util.*;
public class Blackjack{

    private int points;
    private int limit;
    private Scanner scan;
    private boolean firstime = true; //new
    boolean gameOver; //new
    private String answer;//new

    public Blackjack(){
        scan = new Scanner(System.in);
    }

    /*Purpose: To print the current points and the limit.
      Input: Points and Limit
      Output: Points and Limit
    */
    public void displayPoints(){
        System.out.println("Your points:" + points+"/"+limit);
    }

   /*Purpose: To ask the user for the game limit.
      Input: Game limit
     Output: Entered limit
    */
    public void startGame(){//Changes
       if(firstime == true) {
            System.out.println("Start Playing?"); 
            answer = scan.next(); 
       }

       switch(answer) {
       case "yes":
           System.out.println("Enter point limit:");
           limit = scan.nextInt();
           int roll = getRoll();
           points = points + roll;
           displayResult();
           break;
       case "no":
           goodBye();
       } 
   }

   //New method
   public void goodBye() {
       System.out.println("Goodbye!");
       scan.close();
   }


   /*Purpose: To get the roll value from rolling a dice
     Input: Nothing
     Output: Random dice number
   */
   public int getRoll(){
       Random r = new Random();
       int roll = r.nextInt(6)+1;
       System.out.println("You rolled:" + roll);

       return roll;
   }   

   /* Purpose: to display the result of points in the game.
      Input: No input.
      Output: amount of points in the game.
   */
   public void displayResult(){//Changes
      if(points == limit) {
          gameOver = true;
          System.out.println("BlackJack!");
          displayPoints();
          System.out.println("Keep playing?");
          answer = scan.next();
      }
      else if (points > limit) {
          gameOver = true;
          System.out.println("Bust!");
          displayPoints();
          System.out.println("Keep playing?");
          answer = scan.next();
      }
      else if (points < limit) {
          gameOver = false;
          System.out.println("Stand at " + points + " points!"); 

      }
   }

   /*Purpose: to play all methods
     Input: none.
     Output: Game results.
   */

   public void play(){//Changes

       startGame();
       ENDWHILE:while(gameOver == true || gameOver == false) {
           if(answer.equals("yes")) {
               firstime = false;
               while(gameOver == true) {
                   points = 0;
                   startGame();
               }
               while(gameOver == false) {           
                   startGame();
               }

           }else {
               break ENDWHILE;
           }
       }

       goodBye();
   }

   public static void main(String [] args){
       Blackjack practice = new Blackjack();
       practice.play();
   }
}