我不知道为什么我会收到这个错误。我应该怎么做才能修复它?任何帮助都非常感谢。我排除了不影响错误的代码。第 33 行是 String string1 = token.nextToken();
import java.net.*;
import java.io.*;
import java.util.*;
import java.util.Scanner;
public class Exec {
public static void main(String[ ] args){
Scanner input = new Scanner( System.in );
String user_input = " ";
//user gets asked to enter input here...
//...
//tokenize input into 2 strings and method code
user_input = input.next( );
StringTokenizer token = new StringTokenizer(user_input);
String string0 = token.nextToken();
String string1 = token.nextToken();
code = Integer.parseInt(token.nextToken());