java - 输入不匹配异常

Question

我想从 .txt 文件中读取有关 MMORPG 角色的数据，然后根据经验进行筛选(最低经验)。但我遇到了这个异常，我知道它的含义，但我真的不明白我做错了什么。

我不擅长java，实际上我是一个初学者。有人可以向我解释一下吗？也许我正在做一些非常愚蠢的事情。

这是我的代码:

Karakter(角色):

import java.util.Scanner;


public class Karakter {

 private String name;
 private int experience;
 private int maxHealthPoints;
 private int healthPoints;
 private int maxGreed;
 private int greed;

 public Karakter(String nm, int exp, int mHP, int hp, int mG, int g)
 {
  name = nm;
  experience = exp;
  maxHealthPoints = mHP;
  healthPoints = hp;
  maxGreed = mG;
  greed = g;
 }

 public String toString()
 {
  String s = "";
  s += getName(); 
  s += getExperience();
  s += getMaxHealthPoints();
  s += getHealthPoints();
  s += getMaxGreed(); 
  s += getGreed();
  return s;
 }

 public static Karakter read(Scanner sc)
 {
  String name = sc.next();
  int experience = sc.nextInt();
  int maxHealthPoints = sc.nextInt();
  int healthPoints = sc.nextInt();
  int maxGreed = sc.nextInt();
  int greed = sc.nextInt();
  return new Karakter(name, experience, maxHealthPoints, healthPoints, maxGreed, greed);
 }

 public boolean hasExperience(int min)
 {
  return experience >= min;
 }
 // returns true if Krakters have the same name
 public boolean equals(Object other)
 {
  if(!(other instanceof Karakter))
  {
   return false;
  }
  else
  {
   Karakter that = (Karakter) other;
   return that.name == this.name;
  }
 }

 public String getName()
 {
  return name;
 }

 public int getExperience()
 {
  return experience;
 }

 public int getMaxHealthPoints()
 {
  return maxHealthPoints;
 }

 public int getHealthPoints()
 {
  return healthPoints;
 }

 public int getMaxGreed()
 {
  return maxGreed;
 }

 public int getGreed()
 {
  return greed;
 }


}

Karakters(角色):

import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Scanner;

public class Karakters {



private ArrayList<Karakter> kars = new ArrayList<Karakter>();

 public void voegToe(Karakter kar)
 {
  if(!kars.contains(kar))
  {
   kars.add(kar);
  }
 }

 // returns an arraylist of characters with exp >= minexp

 public ArrayList<Karakter> karaktersVanaf(int minExperience)
 {
  Karakter kar = null;
  for(int i = 0; i < kars.size(); i++)
  {
   if(kar.hasExperience(minExperience))
    kars.add(kar);
  }
  return kars;
 }

 public static Karakters read(String infile)
 {
  Karakters k = new Karakters();
  try
  {
   FileReader fr = new FileReader(infile);
   Scanner sc = new Scanner(fr);
   int aantal = sc.nextInt();
   for(int i = 0; i < aantal ; i++)
   {
    Karakter kar = Karakter.read(sc);
    k.kars.add(kar);
   }
   fr.close();
  }
  catch(IOException iox)
  {
   System.out.println(iox);
   return null;
  }
  return k;
 }

}

KarakterZoeker(主要方法):

import java.util.ArrayList;
import java.util.Scanner;


public class KarakterZoeker {


 public static void main(String[] args)
 {


  Scanner sc = new Scanner(System.in);
  Karakters kars = Karakters.read("infile.txt");

  System.out.println("Welke experience wilt u minimaal?");
  int minExp = sc.nextInt();

  ArrayList<Karakter> s = kars.karaktersVanaf(minExp);

  System.out.println(s.toString());

 }

 }

这是错误:

 Exception in thread "main" java.util.InputMismatchException
 at java.util.Scanner.throwFor(Unknown Source)
 at java.util.Scanner.next(Unknown Source)
 at java.util.Scanner.nextInt(Unknown Source)
 at java.util.Scanner.nextInt(Unknown Source)
 at Karakter.read(Karakter.java:38)
 at Karakters.read(Karakters.java:41)
 at KarakterZoeker.main(KarakterZoeker.java:14)

这些行:

Karakter kar = Karakter.read(sc);  (in Karakters)
int experience = sc.nextInt();   (in Karakter)
Karakters kars = Karakters.read("infile.txt");  (in KarakterZoeker)

这是txt文件:

2
name = Dursley
experience = 15
maxHealthPoints = 20
healthPoints = 10
maxGreed = 3
greed = 1
name = Aragorn
experience = 45
maxHealthPoints = 40
healthPoints = 30
maxGreed = 20
greed = 10 

Answer 1

InputMismatchException 由扫描器抛出，表示检索到的 token 与预期类型的​​模式不匹配，或者 token 超出预期类型的​​范围。

所以，我的猜测是，当下一个标记实际上不是 Integer 时，您正在调用 nextInt。

编辑

阅读该文件时需要小心，因为您的标签被视为标记。例如，当您有:

maxHealthPoints = 20 ,

您有三个 token :“maxHealthPoints”、“=”和“20”。问题是您忽略了标签(“=”之前)和等号。我的建议？逐行读取文件并使用扫描仪解析每一行。或者，从文件中删除标签和等号，仅保留要提取的值。