***更新我的帖子以顯示我的所有代碼，希望這提供更多上下文。當我運行該程序時，它會跳過我的第一個“if”語句并拋出錯誤。***我收到錯誤Exception in thread "main" java.lang.NumberFormatException: For input string: ""我正在嘗試在 while 循環(huán)的第一個 else 語句中將字符串變量轉(zhuǎn)換為 int...錯誤發(fā)生在int examScore = Integer.parseInt(userInput).   import java.util.Scanner;//imports scanner   public class ExamScoresCalculator{   public static void main(String[] args){   Scanner scan = new Scanner(System.in);//creates new scanner object    //prompts user for lowest possible exam score   System.out.println("Enter the lowest possible value for the exam: ");   int lowRange = scan.nextInt();   //prompts user for highest possible exam score   System.out.println("Enter the highest possible value for the exam: ");   int highRange = scan.nextInt();   boolean flag = true; //while loop flag   double lowestExamScore = highRange; // holds lowest score   double highestExamScore = lowRange; //holds highest score   double totalPoints = 0; //holds sum of all scores entered   int totalExams = 0; //holds the total number of exams entered by the user   while (flag == true){      System.out.println("Enter an exam score between " + lowRange + " and " + highRange + " or type exit. "); //asks user for an exam score within correct range           String userInput = scan.nextLine();      if ((userInput.equals("exit")) || (userInput.equals("Exit")) || (userInput.equals("EXIT"))){ //checks if user enters "exit"         flag = false; //ends while loop      }