为什么我得到一个空指针异常Java

Question

为什么我得到Null指针异常？ 此代码扫描几个文件，并获取有关用户键入的名称的流行度和含义的信息.changeGraph方法中的图形尚未完成。我特别指出了例外情况（两个地方）。

Exception in thread "main" java.lang.NullPointerException
    at BabyNames.findingStatistics(BabyNames.java:63)
    at BabyNames.main(BabyNames.java:23)



import java.util.*;
import java.io.*;
import java.awt.*;

public class BabyNames{ 
   public static final int STARTINGYEAR = 1890;
   public static final int WIDTH = 60;
   public static final int HEIGHT = 30; 
   private static String nameFinal;
   public static void main(String[] args) throws FileNotFoundException{
      Scanner console = new Scanner(System.in);
      DrawingPanel panel = new DrawingPanel(780,560);
      Graphics g = panel.getGraphics();
      Scanner nameFile = new Scanner(new File("names.txt"));
      Scanner meaningsFile = new Scanner(new File("meanings.txt"));
      Scanner nameFile2 = new Scanner(new File("names2.txt"));
      intro();
      fixedGraph(g);
      String nameFinal = nameToLowerCase(console);
      String meanings = "";
      String popularity = "";
      if(STARTINGYEAR == 1890){
         popularity = findingStatistics(console,nameFile); //EXCEPTION HERE 
      } 
      else{
         popularity = findingStatistics(console, nameFile2);
      }
      meanings = findingStatistics(console, meaningsFile);
      changingGraph(meanings,g,popularity);
   }

   //prints introduction to what the program does
   public static void intro(){ 
      System.out.println("This program allows you to search through the");
      System.out.println("data from the Social Security Administration");
      System.out.println("to see how popular a particular name has been");
      System.out.println("since" + STARTINGYEAR );
      System.out.println();
      System.out.print("Name: ");
   }

   //Converts what the user types in so the first letter is 
   //capitalized and the rest is lower case
   public static String nameToLowerCase(Scanner console){  
      String originalName = console.next();
      String name = "" ;
      int lengthOfName = originalName.length();
      String beginingOfName = originalName.substring(0,1).toUpperCase();
      String endOfName = originalName.substring(1,lengthOfName).toLowerCase();
      name = beginingOfName + endOfName;
      return name;
   }
   public static String findingStatistics(Scanner console, Scanner data){
      boolean goesThroughOnce = false; //stops thhe while statement when the word has been found.
      String statistics = "";
      String currWord = "";
      String currLine = "";
      while (data.hasNext() && goesThroughOnce == false){ 
         currLine = data.nextLine();
         Scanner lineBeingRead = new Scanner(currLine); //make other scanners?? for each file
         currWord = lineBeingRead.next(); 

          if (currWord.equals(nameFinal) || currWord.equals(nameFinal.toUpperCase())){   //EXCEPTION HERE        
            statistics = currLine;
            goesThroughOnce = true;
            System.out.println(statistics);
         }
         else{
         }
      }
      if(goesThroughOnce == false){
         System.out.print(nameFinal + " not found"); //make it so it's the actual original
      }
      return statistics;

   }

   public static void fixedGraph(Graphics g){ //Draws fixed things such as gray blocks and black lines
      g.setColor(Color.LIGHT_GRAY);
      g.fillRect(0,0,780,HEIGHT);
      g.fillRect(0,560-HEIGHT,780,HEIGHT);
      g.setColor(Color.BLACK);
      g.drawLine(0,HEIGHT,780,HEIGHT);
      g.drawLine(0,560-HEIGHT,780,560-HEIGHT);
   }

   public static void changingGraph(String meanings, Graphics g, String popularity){  
     // String meanings = findingStatistics(console,meaningsFile);
      //String popularity = findingStatistics(console,nameFile);
      g.drawString("" + meanings,0,16); //draws meaning text
      int startingYear = STARTINGYEAR;
      int amountOfDecades = 0;
      if(startingYear == 1890){
         amountOfDecades = 13;
      }
      else{
         amountOfDecades = 8;
      }
      g.drawString("" + startingYear,0,552); //fencepost 
      for(int i=0; i<=amountOfDecades;i++){ 
         int year = startingYear + (10 * i);
         g.drawString("" + year,(WIDTH*i),552); //draws decade numbers
      }      
      Scanner popularityData = new Scanner(popularity);
      String currChar = popularityData.next();
      boolean gender = false; //if it is a boys name

      if(currChar.equals("f")){
         gender = true;
      }
      if(gender == true){
         g.setColor(Color.PINK);
      }                              //determines which color the bars will be
      else{
         g.setColor(Color.BLUE);
      }
   }
}