Need help java. Null lang pointer exception at lines 113 and 69.... hers my code and put numbers at the particular lines... Thank you

P4A2.txt is just a list of these words, pig, dog, cat

import java.io.BufferedReader;

import java.io.FileReader;

import java.io.IOException;

import java.io.InputStream;

import java.util.Scanner;

public class P4A2

{

//necessary declarations

static String word[]=new String[200];

static String hint[]=new String[200];

static int correctGuesses=0, numOfWords=0;

static boolean correctGuess=false;

static boolean finished=false;

static StringBuilder underscore,secretWord;

static String slashes="";

//game starting point

public static void main(String arg[])

{

String contsnue="Y";

underscore=new StringBuilder("");

Scanner input=new Scanner(System.in);

//copy secret words into array

System.out.println("**Welcome to Hack the bomb game**");

String contnue = new String(); //loop

while(contnue!="n")

{

//select a random secret word

int rdnum=selectRandomWord();

69 secretWord=new StringBuilder(word[rdnum]);

//print underscores

System.out.println("The secret word");

for(int i=0;i

underscore.append('_');

System.out.println(underscore);

System.out.println("The secret word length -" +underscore.length());

System.out.println("The hint for the secret word-" +hint[rdnum]);

while(true)

{

System.out.println("Guess a letter");

char userGuess=(input.next()).charAt(0);

if(isGuessed(userGuess))

{

if(finished)//if the finished flag is true, game is over

{

System.out.println("Congrats You won!");

break;

}

else

{

113 System.out.println("You own the round! Try next");

}

}

else

{

//track wrong guesses

slashes+="\\";

if(slashes.length()==1)

System.out.println("Bomb color =Blue");

if(slashes.length()==2)

System.out.println("Bomb color =green");

if(slashes.length()==3)

System.out.println("Bomb color =purple");

if(slashes.length()==4)

System.out.println("Bomb color =orange");

if(slashes.length()==5)

System.out.println("Bomb color =red");

if(slashes.length()==6)

{

System.out.println("Bomb color =yellow");

System.out.println("BOOM!!!");

break;

}

}

}

//make ready for another game

underscore.delete(0, underscore.length());

correctGuesses=0;

correctGuess=false;

finished=false;

slashes="";

System.out.println("Do you want to play again(y/n): ");

contnue=input.next();

if(contnue.charAt(0)=='n')

{

System.out.println("Thank you...!");

System.exit(0);

}

}

}

//returns true if the user guess is correct. also identifies whether the game is over or not

public static boolean isGuessed(char g)

{

String guess=Character.toString(g);

int index=secretWord.indexOf(guess);

if(index!=-1)

{

secretWord.replace(index,index+1,"_");

underscore.replace(index,index+ 1,Character.toString(g));//update underscores

System.out.println("The secret word: " +underscore);//print underscore

correctGuesses++; //keep track number of correct guesses

if(correctGuesses==secretWord.length()) //keep track whether the game is over

finished=true;

return true;

}

System.out.println("The secret word: "+underscore);//print underscore

return false;

}

//copies all the words from text file to String array

public static void copyWords()

{

BufferedReader br;

try

{

String sCurrentLine;

String curLines[];

br = new BufferedReader(new FileReader("P4A2.txt"));

while ((sCurrentLine = br.readLine()) != null)

{

curLines=sCurrentLine.split("\t");

word[ numOfWords]=curLines[0];

numOfWords++;

}

}

catch (IOException e)

{

e.printStackTrace();

}

}//end of words

//randomly selects a word

public static int selectRandomWord()

{

int randomNum = (int)(Math.random()*numOfWords);

return randomNum;

}//end of

}//end of ColorBomb game