java InputMismatchExceptionファイルからの読み込み

Question

私は決定木をテストするドライバプログラムを実装していますが、入力ミスマッチの例外が発生しています。これを修正するにはどうすればよいですか？

ここに私のコードです：

import java.io.FileNotFoundException; 

/** 
* LoanApprovalAnaylyzer demonstrates the use of a binary decision tree to 
* decide the approval of a loan. 
*/ 
public class LoanApprovalAnalyzer 
{ 
    /** 
    * Asks questions of the user to get their credit worthiness. 
    */ 
    public static void main (String[] args) throws FileNotFoundException 
    { 
     System.out.println ("So, you need a loan."); 

     DecisionTree expert = new DecisionTree("input2.txt"); 
     expert.evaluate(); 
    } 
} 

これは私の入力ファイルが持っているものです。

13 
Is your income above $100,000? 
Do you have more than 3 dependants? 
Do you have more than 6 dependants? 
Do you own real estate worth less than $200,000? 
Do you own real estate worth more than $200,000? 
Are you above the age of 60? 
Are you above the age of 45? 
Your loan is not approved. 
Your loan is approved. 
Your loan is not approved. 
Your loan is approved 
Your loan is not approved. 
Your loan is approved 
Your loan is not approved. 
Your loan is approved 
3 7 8 
4 9 10 
5 11 12 
1 3 4 
2 5 6 
0 1 2 

これは私の決定木コードである：ここで

import java.util.*; 
import java.io.*; 
/** 
* The DecisionTree class uses the LinkedBinaryTree class to implement 
* a binary decision tree. Tree elements are read from a given file and 
* then the decision tree can be evaluated based on user input using the 
* evaluate method. 
* 
* @author Java Foundations 
* @version 4.0 
*/ 
public class DecisionTree 
{ 
    private LinkedBinaryTree<String> tree; 

    /** 
    * Builds the decision tree based on the contents of the given file 
    * 
    * @param filename the name of the input file 
    * @throws FileNotFoundException if the input file is not found 
    */ 
    public DecisionTree(String filename) throws FileNotFoundException 
    { 
     File inputFile = new File(filename); 
     Scanner scan = new Scanner(inputFile); 
     int numberNodes = scan.nextInt(); 
     scan.nextLine(); 
     int root = 0, left, right; 

     List<LinkedBinaryTree<String>> nodes = new java.util.ArrayList<LinkedBinaryTree<String>>(); 
     for (int i = 0; i < numberNodes; i++) 
      nodes.add(i,new LinkedBinaryTree<String>(scan.nextLine())); 

     while (scan.hasNext()) 
     { 
      root = scan.nextInt(); 
      left = scan.nextInt(); 
      right = scan.nextInt(); 
      scan.nextLine(); 

      nodes.set(root, new LinkedBinaryTree<String>((nodes.get(root)).getRootElement(), 
                 nodes.get(left), nodes.get(right))); 
     } 
     tree = nodes.get(root); 
    } 

    /** 
    * Follows the decision tree based on user responses. 
    */ 
    public void evaluate() 
    { 
     LinkedBinaryTree<String> current = tree; 
     Scanner scan = new Scanner(System.in); 

     while (current.size() > 1) 
     { 
      System.out.println (current.getRootElement()); 
      if (scan.nextLine().equalsIgnoreCase("N")) 
       current = current.getLeft(); 
      else 
       current = current.getRight(); 
     } 

     System.out.println (current.getRootElement()); 
    } 
} 

Answer 1

は問題です：

入力ファイルには、最初の数は13であるため、コードは次の行（nextInt()）に13行とEXPECTSと整数をスキップします。しかし、次の行に整数を得ることができるように、スキップする行は15行あります。

解決策：入力ファイルで、最初の行で13から15に変更します。