我正在为大学项目创建一个WordSearch拼图，并且存在空值问题。我不知道如何调用我的驱动程序测试 [英] I am creating a WordSearch puzzle for a university project and having problems null values. I am not sure how to call my driver tests

问题描述

我正在使用驱动程序从文本文件中获取单词以使用wordsearch拼图。我是新手使用驱动程序，并不知道如何使用它们。驱动程序不工作，当我运行我的代码作为一个整体时，我得到一个错误java.lang.NullPointerException。我已经在公共WordSearchPuzzle（String wordFile，int wordCount，int shortest，int longest）&在司机内。我还包括我的方法来从文件中获取单词。

  import  java.awt。*; 
  import  javax.swing。*; 
  import  java.util。*; 
  import  java.util.ArrayList; 
  import  java.io. *; 
  import  java.io.File; 
  import  java.io.FileReader; 
  import  java.io.IOException; 
 
 
 
 
  public   class  WordSearchPuzzle 
 {
  private   char  [] [] puzzle; 
  private  ArrayList< String>拼图; 
 
 
 
  public  WordSearchPuzzle（ String  wordFile，  int  wordCount，
  int  shortest， int  longest）
 {
 
 puzzleWords = loadWords（wordFile，shortest，longest）; 
 ArrayList< String> chosenWords =  new  ArrayList< String> （）; 
  int  i = 0; 
  int  sum = 0; 
  int  gridSize = 0; 
  for （i = 0; i< wordCount; i ++）
 {
  int  positionOfWord =（ int ）（（Math.random（）* puzzleWords.size（）））;  / /  在终端这一行返回时出现空错误 
 chosenWords.add（puzzleWords.get（positionOfWord））; 
} 
 
  for （i = 0; i< chosenWords.size（）; i ++）
 {
 sum + = chosenWords.get（i）.length（）; 
} 
 gridSize = sum *  2 ; 
 gridSize =（ int ）（Math.sqrt（gridSize））; 
 此 .puzzle =  new   char  [gridSize] [gridSize]; 
 puzzleWords = selectedWords; 
 
 
} 
 
 
  private  ArrayList< String> loadWords（ String  wordFile， int  shortest， int 最长）
 {
 尝试 
 {
 FileReader aFileReader =  new  FileReader（wordFile）; 
 BufferedReader aBuffer =  new  BufferedReader（aFileReader）; 
  String  fileLine; 
  int  lengthOfWord; 
 ArrayList< String> words =  new  ArrayList< String>（）; 
 fileLine = aBuffer.readLine（）; 
  while （fileLine！= null）
 {
 lengthOfWord = fileLine.length（）; 
  if （lengthOfWord> = shortest&& lengthOfWord< = longest）
 {
 words.add（fileLine）; 
} 
 fileLine = aBuffer.readLine（）; 
} 
 aBuffer.close（）; 
 aFileReader.close（）; 
 返回字; 
} 
  catch （IOException x）
 {
  return  null; 
} 
} 
 
 
 
 
 DRIVER ................... ..................... 
 
  import  java.util。*; 
  import  java.util.ArrayList; 
 
  public   class 驱动程序
 {
  public   static   void  main（ String  [] args）
 {
  //   System .out.println（）;  
  //   System.out.println（** ************************以下是对来自文件的随机生成单词的测试************** ****************** + | n）;  
 System.out.println（）; 
 Driver.test1（）;  //  在终端此行回来时出现空错误 
 
 
 
} 
  private   static   void  test1（）
 { //  此测试用例是来自文件bncwords.txt中的随机单词，要选择100个单词，最短长度= 3，最长长度= 3  
 
 WordSearchPuzzle wordSearch =  new  WordSearchPuzzle（  BasicEnglishWords.txt， 50 ， 2 ， 9 ）;  //  此行返回时出现空错误 
 wordSearch.getWo rdSearchList（）;  //  获取所选单词的列表 
 wordSearch.showWordSearchPuzzle（）; 
 
 System.out.println（）;  //  打印拼图 
} 
 
} 

解决方案

  public   class 驱动程序
 {
  public  Driver（）{ //   konstruktor  
 test1（）; 
} 
 
 
  public   static   void  main（ String  [] args）
 {
  //   System.out.println（）;  
  //   System.out.println（**************************以下是随机测试来自文件的生成词******************************** + | n）;  
 System.out.println（）; 
  //   Driver.test1（）; //在终端中，此行返回时出现空错误 
 
 
驱动程序驱动程序= 新 Driver（）;  //  打破静态上下文 
 
 
 
} 
 
  private   void  test1（）
 { //  此测试用例是来自文件bncwords.txt的随机单词，100个要选择的单词，最短长度= 3，最长的长度= 3  
 
 WordSearchPuzzle wordSearch =  new  WordSearchPuzzle（  BasicEnglishWords.txt， 50 ， 2 ， 9 ）;  //  在终端这一行是返回时出现空错误 
 wordSearch.getWordSearchList（）;  //  获取所选单词列表 
 wordSearch.showWordSearchPuzzle（）; 
 
 System.out.println（）;  //  打印拼图 
} 

请花些时间学习：



http://docs.oracle.com/javase/tutorial/java/ index.html [ ^ ]

I am using a driver to get words from a text file to use a wordsearch puzzle. I am new at using drivers and dont really know how to use them. The driver is not working and when i run my code as a whole i get an error java.lang.NullPointerException. I have put comments in where these errors are occuring within the public WordSearchPuzzle(String wordFile, int wordCount, int shortest, int longest) & within the driver. I have also included my method to get the words from the file.

import java.awt.*;
import javax.swing.*;
import java.util.*;
import java.util.ArrayList;
import java.io.*;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
 

 

public class WordSearchPuzzle
 {
     private char[][] puzzle ;
     private ArrayList<String> puzzleWords ;
     
 
   
    public WordSearchPuzzle(String wordFile, int wordCount,
    int shortest, int longest) 
    {
        
        puzzleWords = loadWords(wordFile,shortest, longest);
        ArrayList<String> chosenWords = new ArrayList<String> ();
        int i=0;
        int sum=0;
        int gridSize =0;
        for(i=0;i<wordCount;i++)
        {
           int positionOfWord =(int)((Math.random()*puzzleWords.size()));// in terminal this line is coming back with a null error
            chosenWords.add(puzzleWords.get(positionOfWord));
        }
        
        for(i=0;i<chosenWords.size();i++)
        {
          sum+= chosenWords.get(i).length();
        }
        gridSize = sum *2;
        gridSize = (int)(Math.sqrt(gridSize));
        this.puzzle = new char[gridSize][gridSize];
        puzzleWords = chosenWords;
        
       
    }
    
 
    private ArrayList<String> loadWords(String wordFile,int shortest, int longest)
    {
        try 
        {
            FileReader aFileReader = new FileReader(wordFile);
            BufferedReader aBuffer = new BufferedReader(aFileReader);
            String fileLine;
            int lengthOfWord;
            ArrayList<String> words = new ArrayList<String>();
            fileLine = aBuffer.readLine();
            while(fileLine !=null)
            {
                lengthOfWord= fileLine.length();
                if(lengthOfWord >= shortest && lengthOfWord<= longest)
                {
                    words.add(fileLine);
            }
            fileLine = aBuffer.readLine();
        }
        aBuffer.close();
        aFileReader.close();
        return words;
       }
       catch(IOException x)
       {
        return null;
       }
    }
    
 
   
 
DRIVER........................................
 
import java.util.*;
import java.util.ArrayList;
 
public class Driver
{
     public static void main(String[] args)
    {
       // System.out.println();
       // System.out.println("**************************THE FOLLOWING ARE THE TEST FOR RANDOMLY GENERATED WORDS FROM GIVEN FILES********************************+|n") ;
        System.out.println();
        Driver.test1();//in terminal this line is coming back with a null error

       
       
    }
     private static void test1()
    {//this test case is one with random words from the file bncwords.txt, 100 words to be chosen, shortest length = 3, longest length = 3

        WordSearchPuzzle wordSearch = new WordSearchPuzzle("BasicEnglishWords.txt",50,2,9);//in terminal this line is coming back with a null error
        wordSearch.getWordSearchList() ;//gets the list of chose words
        wordSearch.showWordSearchPuzzle() ;
 
        System.out.println();//prints the puzzle
    }
     
}

解决方案

public class Driver
{
    public Driver(){ // konstruktor
        test1();
    }


    public static void main(String[] args)
    {
       // System.out.println();
       // System.out.println("**************************THE FOLLOWING ARE THE TEST FOR RANDOMLY GENERATED WORDS FROM GIVEN FILES********************************+|n") ;
        System.out.println();
        // Driver.test1();//in terminal this line is coming back with a null error


       Driver driver = new Driver(); // break out of static context
       
       
       
    }
    
    private void test1()
    {//this test case is one with random words from the file bncwords.txt, 100 words to be chosen, shortest length = 3, longest length = 3

        WordSearchPuzzle wordSearch = new WordSearchPuzzle("BasicEnglishWords.txt",50,2,9);//in terminal this line is coming back with a null error
        wordSearch.getWordSearchList() ;//gets the list of chose words
        wordSearch.showWordSearchPuzzle() ;
 
        System.out.println();//prints the puzzle
    }

Please take some time and learn:

http://docs.oracle.com/javase/tutorial/java/index.html[^]

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