Question

我正在为我的学习做作业，但每次执行我的程序时都会出错。错误是“线程中的异常”主“java.util.NoSuchElementException”。

我不知道如何解决这个问题，任何人都可以帮助我吗？

这是我的计划：

import java.util.Scanner;

class Cellulitis {

   Scanner sc = new Scanner(System.in);

   static char automata;//type A or B automaton
   static int length; //length of row
   static int gen; //generation
   static boolean[] cellrow;
   static boolean[] newCellrow;

   void readGeneral() {//define different variables
      automata = sc.next().charAt(0);
      length = sc.nextInt() + 2;
      gen = sc.nextInt();
      cellrow = new boolean[length];
      newCellrow = new boolean[length];

   }

   void readInitialConfiguration() {//input initial configuration
      sc.next();
      while (sc.hasNextInt()) {
         cellrow[sc.nextInt()] = true;
      }
   }



   void draw() {//prints out each cellrow
      for(int i = 0; i < length-1; i++) {
         if(cellrow[i]){
            System.out.print('*');
         }
         else{
            System.out.print(' ');
         }
      }
      System.out.println("");
   }

   boolean newCellValueByA(int k){//calculates the state of each cell by the last cellrow by rules of automaton A
      if (cellrow[k]) {
         if((!cellrow[k-1] && cellrow[k+1]) || (cellrow[k-1] && !cellrow[k+1])){
            return true;
         }
         else{
            return false;
         }
      }
      else{
         if(!cellrow[k-1] && !cellrow[k+1]){
            return false;
         }
         else{
            return true;
         }     
      } 

   }  
   boolean newCellValueByB(int k){//claculates the state of each cell by the last cellrow by rules of automaton B
      if(cellrow[k]) {
         if(!cellrow[k+1]){
            return true;
         }
         else{
            return false;
         }
      }
      else{
         if((!cellrow[k-1] && cellrow[k+1]) || (cellrow[k-1] && !cellrow[k+1])){
            return true;
         }
         else{
            return false;
         }     
      }    

   }

   void changeToNewRow() {//selects what rule will be used and makes the new cellrow
      for(int i = 1; i < length - 1; i++){
         if(automata == 'A'){
            newCellrow[i] = newCellValueByA(i);
         }
         else if(automata == 'B'){
            newCellrow[i] = newCellValueByB(i);
         }
      }
      cellrow = newCellrow.clone();
   }

   void nextCellrow() {//draws the cellrow and jumps to the next cellrow
      for(int i = 1; i < gen; i++){
         draw();
         changeToNewRow();
      }
   }  

   public static void main(String[] args) {
      (new Cellulitis()).readGeneral();
      (new Cellulitis()).readInitialConfiguration();
      (new Cellulitis()).draw();
      (new Cellulitis()).changeToNewRow();
      (new Cellulitis()).nextCellrow();
   }
}

这是我得到的错误：

Exception in thread "main" java.util.NoSuchElementException
   at java.util.Scanner.throwFor(Scanner.java:907)
   at java.util.Scanner.next(Scanner.java:1416)
   at Cellulitis.readInitialConfiguration(Cellulitis.java:28)
   at Cellulitis.main(Cellulitis.java:108)

我该如何解决这个问题？

提前致谢！

Answer 1

正如答案中所见，问题是因为

app

必须改为

Scanner sc = new Scanner(System.in);

当我执行我的程序时，我得到“线程中的异常”主“java.util.NoSuchElementException”

1 个答案: