为什么编译器只编译代码的前两部分？

Question

好的，所以我正在制作一个计算机程序游戏，询问用户的名字和他们想要的中奖号码。然后，我启动了代码。

这是我的代码：

import java.util.Scanner; //For user input
public class Guts 
{
public static void main(String[] args)
{
//Variable declarations
String userName = "";
int winningNumber;
boolean done = false;

Scanner keyboard = new Scanner(System.in);


System.out.println("Please type your name.");
userName = keyboard.next();

System.out.println("Welcome " + userName + ", to a game of Guts!");


 while (!done){

  System.out.println("Enter the winning number (20-50):");
  winningNumber = keyboard.nextInt(); 
  if (winningNumber >= 20 && winningNumber <=50)
  {
     System.out.println("Awesome! Great number!");
     done = true;
     }
  else 
  {
     System.out.println("This number is incorrect. Please enter a number between 20 and 50.");

  }

}


}



boolean humanTurn = true; 
boolean computerTurn = true;
int dice;
int humanTurnScore, computerTurnScore;  
int humanTotalScore = 0;
int computerTotalScore = 0; 


public void roll()  
    {  
    dice = (int)(Math.random()*6) + 1;                   
    }    

public int humanTurnScore()  
    {  
        {  
            humanTurnScore = dice + humanTurnScore;
            System.out.println("You rolled:" + dice);
            System.out.println("Your turn score is " + humanTurnScore + ".");
            } return humanTurnScore;  
        } 
public void humanTurnZero()
{
   humanTurnScore = 0;
} 

 public int computerTurnScore()  
    {  
        {  
            computerTurnScore = dice + computerTurnScore;  
            System.out.println("Computer has scored: " + computerTurnScore + " in its turn.");
            } return computerTurnScore;
      }     
 public void computerTurnZero()
    {
       computerTurnScore = 0;
    } 

public Guts()  
{  
    humanGame();  
    if(!humanTurn)  
    {  
        computerTurn();  
    }  
}  
public int humanGame()
   {             
    System.out.println("To start the game please press 's'.");  
    Scanner key = new Scanner(System.in);  
    String start = key.nextLine();  
    if(!start.equalsIgnoreCase("s")) 
    {
           System.out.println("Make sure you are pressing 's'.");
           humanGame();
    }

    if(start.equalsIgnoreCase("s"))
       {                          
                    System.out.println("You pressed 's'.");  
                    System.out.println("Lets start.");           


        do{  
            roll();    


            if(dice == 1)  
            {  
                System.out.println("You got 1 and you lost your turn.");
                System.out.println("Computer's total score is: " + computerTotalScore);
                humanTurnZero();            
                computerTurn();  

            }  
            else if(dice != 1) 
            {

                humanTotalScore += dice;  
                   if(humanTotalScore >= 50)    
                   {  
                       System.out.println("You rolled: " + dice);
                       System.out.println("Your total score is: " + humanTotalScore);
                       System.out.println("Congratulations, you win!");  
                       System.exit(0);  
                   } 
                humanTurnScore();  
                System.out.println("Your total score is: " + humanTotalScore);  
                System.out.println("Computer's total score is: " + computerTotalScore);
                System.out.println("You can hold or roll again.");  
                System.out.println("To roll again press 'r' or 'h' to hold.");  
                Scanner keyboard = new Scanner(System.in);  
                String choice = keyboard.nextLine();  

                if(choice.equalsIgnoreCase("R"))                                  
                    {    
                      System.out.println("Lets roll again.");   
                      roll();           

                            if(!choice.equalsIgnoreCase("R"))
                               {
                                   System.out.println("You didn't press 'r'. To make sure the program is running correctly please press 'r' to roll or 'h' to hold.");
                                   humanGame();
                               }
                   }

                if(choice.equalsIgnoreCase("h"))  
                    {                         
                    System.out.println("Your total score is: " + humanTotalScore);
                    humanTurnZero();  
                    computerTurn();  
                    }     

               }  

       }while(humanTurn);     

    }return dice;  
}  
public int computerTurn()  
{  
    System.out.println("Now it's computer turn.");  

do {  
    roll();  

    if(dice != 1)  
    {  
        computerTotalScore += dice; 
           if(computerTotalScore >=50)  
               {  
                   System.out.println("Computer rolled: " + dice);
                   System.out.println("Computer's total score is: " + computerTotalScore);
                   System.out.println("Game Over! the computer wins");  
                   System.exit(0);  
               }   
        System.out.println("Computer rolled: " + dice);
        System.out.println("Computer's total score is: " + computerTotalScore);
        System.out.println("Your total score is: " + humanTotalScore);
        computerTurnScore();  
        roll();  
    }  

      if(dice == 1)   
    {  
        System.out.println("Computer rolled a 1, it's turn is over.");  
        computerTurnZero();  
        humanGame();  
    }  


}while (computerTurn);  
return dice;  


}
}

我不明白为什么编译器在循环时不会通过中奖号码做任何事情。

如何修复代码，以便阅读整个内容而不仅仅是第一部分？

Answer 1

根据您的代码，JVM作为第一步来到主方法并执行您在那里提到的内容。根据您在main方法中的代码，JVM不能从while循环中出来，直到您输入一个介于20和50之间的数字。如果您的输入与给定的凭据匹配，JVM将退出循环并结束程序之后JVM无事可做。 如果你需要执行程序的其他部分（正如你在这里提到的那样），那么你必须创建一个类的对象。然后JVM将转到构造函数并执行这些操作。

  

在while循环之后：

while (!done) {

            System.out.println("Enter the winning number (20-50):");
            winningNumber = keyboard.nextInt();
            if (winningNumber >= 20 && winningNumber <= 50) {
                System.out.println("Awesome! Great number!");
                done = true;
            } else {
                System.out.println("This number is incorrect. Please enter a number between 20 and 50.");

            }

        }
         Guts g = new Guts();