trying to create an object

[mbw290]

I wish to store x years of atBats and hits for an object I created named player. In other words this object will store one name then an array element which will be atBats and an array element which is hits. I'm getting a null pointer exception...

This is my object

import java.util.*;
public class Player {

	private String name;
	private int atBats;
	private int hits;
	private int year;

	public Player (String pName, int pAtBats, int pHits)
	{
		name =pName;
		atBats=pAtBats;
		hits=pHits;
		
	}
	public int getHits()
	{
		return hits;
	}
	public int getAtBats()
	{
		return atBats;
	}
	public float getAverage(){
		
		return (float)hits/(float)atBats;
	}
	public float getYear(){
		return year;
	}

		

	public String reverseName ()
	{
		String first= " ";
		String last = " ";
		StringTokenizer st;
		st=new StringTokenizer (name, " ");
		if (st.countTokens() !=2){
			System.exit(1);
		}
		while (st.hasMoreElements()){
			first=st.nextToken();
			last=st.nextToken();
		}
	return last + first;
	}
	}

Then this is my main method

import java.io.*;
public class mattPlayer {


	 public static void main(String[] args)throws IOException
	{
		 int numHit[];
		 int numAB[];		 
		int j=0;
		 String years;
		 int numYears=0;
		 int i=0;
		 String hits;
		 String atBats;
		 Player jDoe [];
		 jDoe=new Player [numYears];
		 int nYear=0;
		 
		 //DecimalFormat formatter=new DecimalFormat (".000");
		 System.out.print("Enter player name: ");
		 BufferedReader br=new BufferedReader(new InputStreamReader (System.in));
			String name;
		name=br.readLine();
			
			System.out.print("How many years do you have? : ");
			years=br.readLine();
			
			try {
				numYears=Integer.parseInt(years);
				for (i=0;i<numYears;i++){
					numHit=new int [numYears];
					numAB=new int [numYears];
					jDoe=new Player [numYears];
					 System.out.print("Enter player hits: ");
					 hits=br.readLine();
							 try {
								 numHit[i]=Integer.parseInt(hits);
								 }
							 catch (NumberFormatException e){
								 System.exit(1);
							 }
							 
							 System.out.print("Enter player at bats: ");
							 atBats=br.readLine();
									 try {
										 numAB[i]=Integer.parseInt(atBats);
										 }
									 catch (NumberFormatException e){
										 System.exit(1);
									 }
							  jDoe[i]=new Player(name,numAB[i],numHit[i]);
							  
				}
			}
							
				
				
				catch (NumberFormatException e){
					System.exit(1);
				}
				//System.out.print("enter year to retrieve (remember 0 is the first year you entered): ");
				//String year=br.readLine();
			//try {
				//nYear=Integer.parseInt(year);
			
		//		System.out.println(jDoe[nYear].getAtBats());
				
			//}
			//catch (NumberFormatException e){
		
			//}
				for (j=0;j<numYears;j++){
					System.out.println(jDoe[j].getAtBats());
				}
			

			
		
				
				
			
			
				
				
				
			
			
			
	}
}

[Fubarable]

Which line throws the NPE?

[mbw290]

Exception in thread "main" java.lang.NullPointerException
at mattPlayer.main(mattPlayer.java:73)

[Fubarable]

You need to tell us or show us which line that is. You have a null variable on that line and without knowing which line it is you and us can't solve this.

Hint: also make sure that you've constructed all arrays before using them.

[mbw290]

It's System.out.println(jDoe[j].getAtBats());

[Tolls]

jDoe[j] is null.
Now you need ot put some System.out.println("<some usueful text>") calls scattered around in there so you can see what the code is doing.