Programming Forums > Application Development > Java

sbob60 · Oct 1st, 2007, 6:09 PM

Hi,

Before I begin, I am not asking anyone to do my homework for me, I know that is against forum rules. I just need a little help on where to start.

I have a CS assignment, and we have to make a hangman program. The basic output should be (if the word is "computer"):

(Toggle Plain Text)

_ _ _ _ _ _ _ _    // # of blanks = word.length()

Enter guess: // just a single char

/*if correct*/

c _ _ _ _ _ _ _    // increases variable for number of correct guesses (numCorrect++)

Enter guess:

/*if wrong*/
 
    O // Hangman's head
_ _ _ _ _ _ _ _    // increases variable for number of wrong guesses (numWrong++)

Enter guess:

// and so on

Our teacher is not allowing us to use string buffers, and I'm not really sure what to do. I get the basic idea of how to change the hangman, how to determine the winner, and such but I'm not sure what I'm supposed to start with when I display the blanks and how to update them (the game part).

The list of words is imported from a word.txt file. So all the words come from an arraylist.

Any tips would be greatly appreciated.

Thanks.

DaWei · Oct 1st, 2007, 8:57 PM

Write some code (we won't write it for you). We'll help you fix it. This is a common homework question, seen a dozen times a year.

sbob60 · Oct 1st, 2007, 11:34 PM

I know this is horrifically bad code, but I'm a noob.

(Toggle Plain Text)

import java.io.*;
import java.util.ArrayList;
import java.util.Random;

public class test 
{
	private ArrayList <String> masterwords,list;
	private ArrayList <String> used;
	private String input, current;
	String blanks;
	
	public test()
	{
		masterwords.add("rsgh");
		masterwords.add("rsthh");
		masterwords.add("rstlfgfh");
		masterwords.add("rsgh");
		masterwords.add("rsthh");
		masterwords.add("rstlfgfh");
	}
	
	
	
	public ArrayList getList(int x)
	{
		if(x == 1)
		{
			for(int y=0; y<=masterwords.size(); y++)
			{
				if(masterwords.get(y).length()<4 && getCommon(masterwords.get(y))>=2)
				{
					list.add(masterwords.get(y));
				}
			}
		}
		
		else if(x == 2)
		{
			for(int y=0; y<=masterwords.size(); y++)
			{
				if(masterwords.get(y).length()>=4 && masterwords.get(y).length()<8 && getCommon(masterwords.get(y))>=3)
				{
					list.add(masterwords.get(y));
				}
			}
		}
		
		else
		{
			for(int y=0; y<=masterwords.size(); y++)
			{
				if(masterwords.get(y).length()>=8)
				{
					list.add(masterwords.get(y));
				}
			}	
		}
		return list;
	}
	
	public int getCommon(String c)
	{
		int count = 0;
			
		for(int x = 0; x <= c.length(); x++)
		{
			if(c.charAt(x) == 'r' || c.charAt(x) == 's' || c.charAt(x) == 't' || c.charAt(x) == 'l' || c.charAt(x) == 'n' || c.charAt(x) == 'e' || c.charAt(x) == 'R' || c.charAt(x) == 'S' || c.charAt(x) == 'T' || c.charAt(x) == 'L' || c.charAt(x) == 'N' || c.charAt(x) == 'E')
			   count++;
		}
		
		return count;
	}
	
	public String getWord(int x)
	{
		ArrayList <String> lst = getList(x);
		Random rand = new Random(lst.size());
		int random = rand.nextInt();
		current = lst.get(random);
		return current;
	}
	
	public String getInput(String x)
	{
		input = x;
		used.add(input);
		return input;
	}
	
	public String getCur()
	{
		return current;
	}
	
	public boolean repeat(String x)
	{
		boolean a = false;

		
		for(int y=0; y<=used.size(); y++)
		{
			if(getInput(x).equals(used.get(y)))
			{
				a = true;
			}
		}
		
		return a;
	}
	
	public void makeBlanks(String s)
	{
		blanks = "";
		for(int x=1; x<s.length(); x++)
		{
			blanks += "_ ";
		}
	}
	
	public String getBlanks()
	{
		return blanks;
	}
	
	public void updateBlanks(String s)
	{
		char sc = s.charAt(0); 
		for(int x = 0; x<=getBlanks().length(); x++)
		{
			if(getCur().charAt(x)==sc)
			{
				blanks.substring(x,x).replace('_',sc);
			}
		}		
	}	
    
     

	

}

import java.io.*;
import java.util.ArrayList;
import java.util.Random;

public class test 
{
	private ArrayList <String> masterwords,list;
	private ArrayList <String> used;
	private String input, current;
	String blanks;
	
	public test()
	{
		masterwords.add("rsgh");
		masterwords.add("rsthh");
		masterwords.add("rstlfgfh");
		masterwords.add("rsgh");
		masterwords.add("rsthh");
		masterwords.add("rstlfgfh");
	}
	
	
	
	public ArrayList getList(int x)
	{
		if(x == 1)
		{
			for(int y=0; y<=masterwords.size(); y++)
			{
				if(masterwords.get(y).length()<4 && getCommon(masterwords.get(y))>=2)
				{
					list.add(masterwords.get(y));
				}
			}
		}
		
		else if(x == 2)
		{
			for(int y=0; y<=masterwords.size(); y++)
			{
				if(masterwords.get(y).length()>=4 && masterwords.get(y).length()<8 && getCommon(masterwords.get(y))>=3)
				{
					list.add(masterwords.get(y));
				}
			}
		}
		
		else
		{
			for(int y=0; y<=masterwords.size(); y++)
			{
				if(masterwords.get(y).length()>=8)
				{
					list.add(masterwords.get(y));
				}
			}	
		}
		return list;
	}
	
	public int getCommon(String c)
	{
		int count = 0;
			
		for(int x = 0; x <= c.length(); x++)
		{
			if(c.charAt(x) == 'r' || c.charAt(x) == 's' || c.charAt(x) == 't' || c.charAt(x) == 'l' || c.charAt(x) == 'n' || c.charAt(x) == 'e' || c.charAt(x) == 'R' || c.charAt(x) == 'S' || c.charAt(x) == 'T' || c.charAt(x) == 'L' || c.charAt(x) == 'N' || c.charAt(x) == 'E')
			   count++;
		}
		
		return count;
	}
	
	public String getWord(int x)
	{
		ArrayList <String> lst = getList(x);
		Random rand = new Random(lst.size());
		int random = rand.nextInt();
		current = lst.get(random);
		return current;
	}
	
	public String getInput(String x)
	{
		input = x;
		used.add(input);
		return input;
	}
	
	public String getCur()
	{
		return current;
	}
	
	public boolean repeat(String x)
	{
		boolean a = false;

		
		for(int y=0; y<=used.size(); y++)
		{
			if(getInput(x).equals(used.get(y)))
			{
				a = true;
			}
		}
		
		return a;
	}
	
	public void makeBlanks(String s)
	{
		blanks = "";
		for(int x=1; x<s.length(); x++)
		{
			blanks += "_ ";
		}
	}
	
	public String getBlanks()
	{
		return blanks;
	}
	
	public void updateBlanks(String s)
	{
		char sc = s.charAt(0); 
		for(int x = 0; x<=getBlanks().length(); x++)
		{
			if(getCur().charAt(x)==sc)
			{
				blanks.substring(x,x).replace('_',sc);
			}
		}		
	}	
    
     

	

}

when i try to test this, i get a null pointer exception.

andro · Oct 1st, 2007, 11:47 PM

Sure you do. In getList(), you use the variable "list" without ever initializing it. And that's probably not the only variable you do so with. I don't see "master" initialized anywhere either.

sbob60 · Oct 2nd, 2007, 2:33 PM

That wasn't the problem I was having because I hadn't tested that part yet. I fixed how the words are gathered, and I know the arraylist for the input is working fine. I am trying to test the "getBlanks" method but it is just outputting "null".

this is test.java:

(Toggle Plain Text)

import java.io.*;
import java.util.ArrayList;

class test 
{
	private input in;
	private ArrayList <String> masterwords = new ArrayList();
	private ArrayList <String> list = new ArrayList();
	private ArrayList <String> used;
	private String input, current;
	String blanks;	
	private Scanner file;
	private Random rand;
	
	
	public test()throws IOException
	{
		in = new input("words.txt");
		masterwords = in.getMW();
	}

	
	public ArrayList getList(int x)
	{
		if(x == 1)
		{
			for(int y=0; y<=masterwords.size(); y++)
			{
				if(masterwords.get(y).length()<4 && getCommon(masterwords.get(y))>=2)
				{
					list.add(masterwords.get(y));
				}
			}
		}
		
		else if(x == 2)
		{
			for(int y=0; y<=masterwords.size(); y++)
			{
				if(masterwords.get(y).length()>=4 && masterwords.get(y).length()<8 && getCommon(masterwords.get(y))>=3)
				{
					list.add(masterwords.get(y));
				}
			}
		}
		
		else
		{
			for(int y=0; y<=masterwords.size(); y++)
			{
				if(masterwords.get(y).length()>=8)
				{
					list.add(masterwords.get(y));
				}
			}	
		}
		return list;
	}
	
	public int getCommon(String c)
	{
		int count = 0;
			
		for(int x = 0; x <= c.length(); x++)
		{
			if(c.charAt(x) == 'r' || c.charAt(x) == 's' || c.charAt(x) == 't' || c.charAt(x) == 'l' || c.charAt(x) == 'n' || c.charAt(x) == 'e' || c.charAt(x) == 'R' || c.charAt(x) == 'S' || c.charAt(x) == 'T' || c.charAt(x) == 'L' || c.charAt(x) == 'N' || c.charAt(x) == 'E')
				count++;
		}
		
		return count;
	}
	
	public String getWord(int x)
	{
		ArrayList <String> lst = getList(x);
		Random rand = new Random(lst.size());
		int random = rand.nextInt();
		current = lst.get(random);
		return current;
	}
	
	public String getInput(String x)
	{
		input = x;
		used.add(input);
		return input;
	}
	
	public String getCur()
	{
		return current;
	}
	
	public boolean repeat(String x)
	{
		boolean a = false;

		
		for(int y=0; y<=used.size(); y++)
		{
			if(getInput(x).equals(used.get(y)))
			{
				a = true;
			}
		}
		
		return a;
	}
	
	public void makeBlanks(String s)
	{
		blanks = "";
		for(int x=1; x<s.length(); x++)
		{
			blanks += "_ ";
		}
	}
	
	public String getBlanks()
	{
		return blanks;
	}
	
	public void updateBlanks(String s)
	{
		char sc = s.charAt(0); 
		for(int x = 0; x<=getBlanks().length(); x++)
		{
			if(getCur().charAt(x)==sc)
			{
				blanks.substring(x,x).replace('_',sc);
			}
		}		
	}	
    
     

	

}

import java.io.*;
import java.util.ArrayList;

class test 
{
	private input in;
	private ArrayList <String> masterwords = new ArrayList();
	private ArrayList <String> list = new ArrayList();
	private ArrayList <String> used;
	private String input, current;
	String blanks;	
	private Scanner file;
	private Random rand;
	
	
	public test()throws IOException
	{
		in = new input("words.txt");
		masterwords = in.getMW();
	}

	
	public ArrayList getList(int x)
	{
		if(x == 1)
		{
			for(int y=0; y<=masterwords.size(); y++)
			{
				if(masterwords.get(y).length()<4 && getCommon(masterwords.get(y))>=2)
				{
					list.add(masterwords.get(y));
				}
			}
		}
		
		else if(x == 2)
		{
			for(int y=0; y<=masterwords.size(); y++)
			{
				if(masterwords.get(y).length()>=4 && masterwords.get(y).length()<8 && getCommon(masterwords.get(y))>=3)
				{
					list.add(masterwords.get(y));
				}
			}
		}
		
		else
		{
			for(int y=0; y<=masterwords.size(); y++)
			{
				if(masterwords.get(y).length()>=8)
				{
					list.add(masterwords.get(y));
				}
			}	
		}
		return list;
	}
	
	public int getCommon(String c)
	{
		int count = 0;
			
		for(int x = 0; x <= c.length(); x++)
		{
			if(c.charAt(x) == 'r' || c.charAt(x) == 's' || c.charAt(x) == 't' || c.charAt(x) == 'l' || c.charAt(x) == 'n' || c.charAt(x) == 'e' || c.charAt(x) == 'R' || c.charAt(x) == 'S' || c.charAt(x) == 'T' || c.charAt(x) == 'L' || c.charAt(x) == 'N' || c.charAt(x) == 'E')
				count++;
		}
		
		return count;
	}
	
	public String getWord(int x)
	{
		ArrayList <String> lst = getList(x);
		Random rand = new Random(lst.size());
		int random = rand.nextInt();
		current = lst.get(random);
		return current;
	}
	
	public String getInput(String x)
	{
		input = x;
		used.add(input);
		return input;
	}
	
	public String getCur()
	{
		return current;
	}
	
	public boolean repeat(String x)
	{
		boolean a = false;

		
		for(int y=0; y<=used.size(); y++)
		{
			if(getInput(x).equals(used.get(y)))
			{
				a = true;
			}
		}
		
		return a;
	}
	
	public void makeBlanks(String s)
	{
		blanks = "";
		for(int x=1; x<s.length(); x++)
		{
			blanks += "_ ";
		}
	}
	
	public String getBlanks()
	{
		return blanks;
	}
	
	public void updateBlanks(String s)
	{
		char sc = s.charAt(0); 
		for(int x = 0; x<=getBlanks().length(); x++)
		{
			if(getCur().charAt(x)==sc)
			{
				blanks.substring(x,x).replace('_',sc);
			}
		}		
	}	
    
     

	

}

this is input.java

(Toggle Plain Text)

import java.io.*;
import java.util.ArrayList;
import java.util.Random;
import java.util.Scanner;

public class input {
	private Scanner file;
	private Random rand;
	private ArrayList<String>masterwords;
	
	public input(String newFile)throws IOException
	{
		file = new Scanner(new File(newFile));
		rand = new Random();
		masterwords = new ArrayList<String>()
		while(file.hasNext())
		{
			String nextWord = file.nextLine();
			masterwords.add(nextWord);
		}//while
		
		
	}//input
	
	public ArrayList getMW() 
	{
		return masterwords;
	}
    
}

I am really lost.

sbob60 · Oct 2nd, 2007, 3:10 PM

fixed the "null" thing but I'm getting the null pointer. Where am i supposed to initialize it?

andro · Oct 2nd, 2007, 5:35 PM

I don't see "ArrayList<String> used" initialized anywhere, do you?

sbob60 · Oct 2nd, 2007, 6:38 PM

Well, ya, i fixed that. But the null pointer is coming in the "getList" method

(Toggle Plain Text)

for(int y=0; y<=masterwords.size(); y++)
{
	if(masterwords.get(y).length()<4 && getCommon(masterwords.get(y))>=2)
	{
		list.add(masterwords.get(y));
	}
}

thats the section im testing, and it gives me an error in the if statement. I'm not sure whats going on.

Oct 1st, 2007, 6:09 PM	#1
sbob60 Newbie Join Date: Oct 2007 Posts: 6 Rep Power: 0	Hangman Hi, Before I begin, I am not asking anyone to do my homework for me, I know that is against forum rules. I just need a little help on where to start. I have a CS assignment, and we have to make a hangman program. The basic output should be (if the word is "computer"): (Toggle Plain Text) _ _ _ _ _ _ _ _ // # of blanks = word.length() Enter guess: // just a single char /if correct/ c _ _ _ _ _ _ _ // increases variable for number of correct guesses (numCorrect++) Enter guess: /if wrong/ O // Hangman's head _ _ _ _ _ _ _ _ // increases variable for number of wrong guesses (numWrong++) Enter guess: // and so on _ _ _ _ _ _ _ _ // # of blanks = word.length() Enter guess: // just a single char /if correct/ c _ _ _ _ _ _ _ // increases variable for number of correct guesses (numCorrect++) Enter guess: /if wrong/ O // Hangman's head _ _ _ _ _ _ _ _ // increases variable for number of wrong guesses (numWrong++) Enter guess: // and so on Our teacher is not allowing us to use string buffers, and I'm not really sure what to do. I get the basic idea of how to change the hangman, how to determine the winner, and such but I'm not sure what I'm supposed to start with when I display the blanks and how to update them (the game part). The list of words is imported from a word.txt file. So all the words come from an arraylist. Any tips would be greatly appreciated. Thanks.

Oct 1st, 2007, 8:57 PM	#2
DaWei Resident Grouch Join Date: Jun 2005 Posts: 6,453 Rep Power: 10	Write some code (we won't write it for you). We'll help you fix it. This is a common homework question, seen a dozen times a year. __________________ Abstraction doesn't make it impossible to write bad code; it makes it possible to write superior code. Contributor's Corner: Grumpy on C++ Exceptions DaWei on Pointers

Oct 1st, 2007, 11:47 PM	#4
andro Professional Programmer Join Date: Oct 2005 Location: California Posts: 311 Rep Power: 3	Sure you do. In getList(), you use the variable "list" without ever initializing it. And that's probably not the only variable you do so with. I don't see "master" initialized anywhere either. __________________ http://www.kevinherron.com/

Oct 2nd, 2007, 2:33 PM	#5
sbob60 Newbie Join Date: Oct 2007 Posts: 6 Rep Power: 0	That wasn't the problem I was having because I hadn't tested that part yet. I fixed how the words are gathered, and I know the arraylist for the input is working fine. I am trying to test the "getBlanks" method but it is just outputting "null". this is test.java: (Toggle Plain Text) import java.io.; import java.util.ArrayList; class test { private input in; private ArrayList <String> masterwords = new ArrayList(); private ArrayList <String> list = new ArrayList(); private ArrayList <String> used; private String input, current; String blanks; private Scanner file; private Random rand; public test()throws IOException { in = new input("words.txt"); masterwords = in.getMW(); } public ArrayList getList(int x) { if(x == 1) { for(int y=0; y<=masterwords.size(); y++) { if(masterwords.get(y).length()<4 && getCommon(masterwords.get(y))>=2) { list.add(masterwords.get(y)); } } } else if(x == 2) { for(int y=0; y<=masterwords.size(); y++) { if(masterwords.get(y).length()>=4 && masterwords.get(y).length()<8 && getCommon(masterwords.get(y))>=3) { list.add(masterwords.get(y)); } } } else { for(int y=0; y<=masterwords.size(); y++) { if(masterwords.get(y).length()>=8) { list.add(masterwords.get(y)); } } } return list; } public int getCommon(String c) { int count = 0; for(int x = 0; x <= c.length(); x++) { if(c.charAt(x) == 'r' \|\| c.charAt(x) == 's' \|\| c.charAt(x) == 't' \|\| c.charAt(x) == 'l' \|\| c.charAt(x) == 'n' \|\| c.charAt(x) == 'e' \|\| c.charAt(x) == 'R' \|\| c.charAt(x) == 'S' \|\| c.charAt(x) == 'T' \|\| c.charAt(x) == 'L' \|\| c.charAt(x) == 'N' \|\| c.charAt(x) == 'E') count++; } return count; } public String getWord(int x) { ArrayList <String> lst = getList(x); Random rand = new Random(lst.size()); int random = rand.nextInt(); current = lst.get(random); return current; } public String getInput(String x) { input = x; used.add(input); return input; } public String getCur() { return current; } public boolean repeat(String x) { boolean a = false; for(int y=0; y<=used.size(); y++) { if(getInput(x).equals(used.get(y))) { a = true; } } return a; } public void makeBlanks(String s) { blanks = ""; for(int x=1; x<s.length(); x++) { blanks += "_ "; } } public String getBlanks() { return blanks; } public void updateBlanks(String s) { char sc = s.charAt(0); for(int x = 0; x<=getBlanks().length(); x++) { if(getCur().charAt(x)==sc) { blanks.substring(x,x).replace('_',sc); } } } } import java.io.; import java.util.ArrayList; class test { private input in; private ArrayList <String> masterwords = new ArrayList(); private ArrayList <String> list = new ArrayList(); private ArrayList <String> used; private String input, current; String blanks; private Scanner file; private Random rand; public test()throws IOException { in = new input("words.txt"); masterwords = in.getMW(); } public ArrayList getList(int x) { if(x == 1) { for(int y=0; y<=masterwords.size(); y++) { if(masterwords.get(y).length()<4 && getCommon(masterwords.get(y))>=2) { list.add(masterwords.get(y)); } } } else if(x == 2) { for(int y=0; y<=masterwords.size(); y++) { if(masterwords.get(y).length()>=4 && masterwords.get(y).length()<8 && getCommon(masterwords.get(y))>=3) { list.add(masterwords.get(y)); } } } else { for(int y=0; y<=masterwords.size(); y++) { if(masterwords.get(y).length()>=8) { list.add(masterwords.get(y)); } } } return list; } public int getCommon(String c) { int count = 0; for(int x = 0; x <= c.length(); x++) { if(c.charAt(x) == 'r' \|\| c.charAt(x) == 's' \|\| c.charAt(x) == 't' \|\| c.charAt(x) == 'l' \|\| c.charAt(x) == 'n' \|\| c.charAt(x) == 'e' \|\| c.charAt(x) == 'R' \|\| c.charAt(x) == 'S' \|\| c.charAt(x) == 'T' \|\| c.charAt(x) == 'L' \|\| c.charAt(x) == 'N' \|\| c.charAt(x) == 'E') count++; } return count; } public String getWord(int x) { ArrayList <String> lst = getList(x); Random rand = new Random(lst.size()); int random = rand.nextInt(); current = lst.get(random); return current; } public String getInput(String x) { input = x; used.add(input); return input; } public String getCur() { return current; } public boolean repeat(String x) { boolean a = false; for(int y=0; y<=used.size(); y++) { if(getInput(x).equals(used.get(y))) { a = true; } } return a; } public void makeBlanks(String s) { blanks = ""; for(int x=1; x<s.length(); x++) { blanks += "_ "; } } public String getBlanks() { return blanks; } public void updateBlanks(String s) { char sc = s.charAt(0); for(int x = 0; x<=getBlanks().length(); x++) { if(getCur().charAt(x)==sc) { blanks.substring(x,x).replace('_',sc); } } } } this is input.java (Toggle Plain Text) import java.io.; import java.util.ArrayList; import java.util.Random; import java.util.Scanner; public class input { private Scanner file; private Random rand; private ArrayList<String>masterwords; public input(String newFile)throws IOException { file = new Scanner(new File(newFile)); rand = new Random(); masterwords = new ArrayList<String>() while(file.hasNext()) { String nextWord = file.nextLine(); masterwords.add(nextWord); }//while }//input public ArrayList getMW() { return masterwords; } } import java.io.; import java.util.ArrayList; import java.util.Random; import java.util.Scanner; public class input { private Scanner file; private Random rand; private ArrayList<String>masterwords; public input(String newFile)throws IOException { file = new Scanner(new File(newFile)); rand = new Random(); masterwords = new ArrayList<String>() while(file.hasNext()) { String nextWord = file.nextLine(); masterwords.add(nextWord); }//while }//input public ArrayList getMW() { return masterwords; } } I am really lost. Last edited by sbob60; Oct 2nd, 2007 at 2:58 PM.

Oct 2nd, 2007, 5:35 PM	#7
andro Professional Programmer Join Date: Oct 2005 Location: California Posts: 311 Rep Power: 3	I don't see "ArrayList<String> used" initialized anywhere, do you? __________________ http://www.kevinherron.com/

Oct 1st, 2007, 11:34 PM	#3
sbob60 Newbie Join Date: Oct 2007 Posts: 6 Rep Power: 0	I know this is horrifically bad code, but I'm a noob. (Toggle Plain Text) import java.io.; import java.util.ArrayList; import java.util.Random; public class test { private ArrayList <String> masterwords,list; private ArrayList <String> used; private String input, current; String blanks; public test() { masterwords.add("rsgh"); masterwords.add("rsthh"); masterwords.add("rstlfgfh"); masterwords.add("rsgh"); masterwords.add("rsthh"); masterwords.add("rstlfgfh"); } public ArrayList getList(int x) { if(x == 1) { for(int y=0; y<=masterwords.size(); y++) { if(masterwords.get(y).length()<4 && getCommon(masterwords.get(y))>=2) { list.add(masterwords.get(y)); } } } else if(x == 2) { for(int y=0; y<=masterwords.size(); y++) { if(masterwords.get(y).length()>=4 && masterwords.get(y).length()<8 && getCommon(masterwords.get(y))>=3) { list.add(masterwords.get(y)); } } } else { for(int y=0; y<=masterwords.size(); y++) { if(masterwords.get(y).length()>=8) { list.add(masterwords.get(y)); } } } return list; } public int getCommon(String c) { int count = 0; for(int x = 0; x <= c.length(); x++) { if(c.charAt(x) == 'r' \|\| c.charAt(x) == 's' \|\| c.charAt(x) == 't' \|\| c.charAt(x) == 'l' \|\| c.charAt(x) == 'n' \|\| c.charAt(x) == 'e' \|\| c.charAt(x) == 'R' \|\| c.charAt(x) == 'S' \|\| c.charAt(x) == 'T' \|\| c.charAt(x) == 'L' \|\| c.charAt(x) == 'N' \|\| c.charAt(x) == 'E') count++; } return count; } public String getWord(int x) { ArrayList <String> lst = getList(x); Random rand = new Random(lst.size()); int random = rand.nextInt(); current = lst.get(random); return current; } public String getInput(String x) { input = x; used.add(input); return input; } public String getCur() { return current; } public boolean repeat(String x) { boolean a = false; for(int y=0; y<=used.size(); y++) { if(getInput(x).equals(used.get(y))) { a = true; } } return a; } public void makeBlanks(String s) { blanks = ""; for(int x=1; x<s.length(); x++) { blanks += "_ "; } } public String getBlanks() { return blanks; } public void updateBlanks(String s) { char sc = s.charAt(0); for(int x = 0; x<=getBlanks().length(); x++) { if(getCur().charAt(x)==sc) { blanks.substring(x,x).replace('_',sc); } } } } import java.io.; import java.util.ArrayList; import java.util.Random; public class test { private ArrayList <String> masterwords,list; private ArrayList <String> used; private String input, current; String blanks; public test() { masterwords.add("rsgh"); masterwords.add("rsthh"); masterwords.add("rstlfgfh"); masterwords.add("rsgh"); masterwords.add("rsthh"); masterwords.add("rstlfgfh"); } public ArrayList getList(int x) { if(x == 1) { for(int y=0; y<=masterwords.size(); y++) { if(masterwords.get(y).length()<4 && getCommon(masterwords.get(y))>=2) { list.add(masterwords.get(y)); } } } else if(x == 2) { for(int y=0; y<=masterwords.size(); y++) { if(masterwords.get(y).length()>=4 && masterwords.get(y).length()<8 && getCommon(masterwords.get(y))>=3) { list.add(masterwords.get(y)); } } } else { for(int y=0; y<=masterwords.size(); y++) { if(masterwords.get(y).length()>=8) { list.add(masterwords.get(y)); } } } return list; } public int getCommon(String c) { int count = 0; for(int x = 0; x <= c.length(); x++) { if(c.charAt(x) == 'r' \|\| c.charAt(x) == 's' \|\| c.charAt(x) == 't' \|\| c.charAt(x) == 'l' \|\| c.charAt(x) == 'n' \|\| c.charAt(x) == 'e' \|\| c.charAt(x) == 'R' \|\| c.charAt(x) == 'S' \|\| c.charAt(x) == 'T' \|\| c.charAt(x) == 'L' \|\| c.charAt(x) == 'N' \|\| c.charAt(x) == 'E') count++; } return count; } public String getWord(int x) { ArrayList <String> lst = getList(x); Random rand = new Random(lst.size()); int random = rand.nextInt(); current = lst.get(random); return current; } public String getInput(String x) { input = x; used.add(input); return input; } public String getCur() { return current; } public boolean repeat(String x) { boolean a = false; for(int y=0; y<=used.size(); y++) { if(getInput(x).equals(used.get(y))) { a = true; } } return a; } public void makeBlanks(String s) { blanks = ""; for(int x=1; x<s.length(); x++) { blanks += "_ "; } } public String getBlanks() { return blanks; } public void updateBlanks(String s) { char sc = s.charAt(0); for(int x = 0; x<=getBlanks().length(); x++) { if(getCur().charAt(x)==sc) { blanks.substring(x,x).replace('_',sc); } } } } when i try to test this, i get a null pointer exception.

Oct 2nd, 2007, 3:10 PM	#6
sbob60 Newbie Join Date: Oct 2007 Posts: 6 Rep Power: 0	fixed the "null" thing but I'm getting the null pointer. Where am i supposed to initialize it?

Oct 2nd, 2007, 6:38 PM	#8
sbob60 Newbie Join Date: Oct 2007 Posts: 6 Rep Power: 0	Well, ya, i fixed that. But the null pointer is coming in the "getList" method (Toggle Plain Text) for(int y=0; y<=masterwords.size(); y++) { if(masterwords.get(y).length()<4 && getCommon(masterwords.get(y))>=2) { list.add(masterwords.get(y)); } } for(int y=0; y<=masterwords.size(); y++) { if(masterwords.get(y).length()<4 && getCommon(masterwords.get(y))>=2) { list.add(masterwords.get(y)); } } thats the section im testing, and it gives me an error in the if statement. I'm not sure whats going on.

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