Exception in thread "main" java.lang.NullPointerException

[shhhhh]

what is the problem with the code.....:(



import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.StringTokenizer;
import java.util.logging.Level;
import java.util.logging.Logger;

class graph
{

public ArrayList<Integer[]> v=new ArrayList<Integer[]>();
public ArrayList<Integer[]> e=new ArrayList<Integer[]>();


}


public class main {



public static void main(String[] args) {

Integer vv[]=new Integer[2];
Integer ee[]=new Integer[3];
graph g[]=new graph[1000];
int i=-1;
String t="t";
String v="v";
String e="e";
FileInputStream fstream;
try {
fstream = new FileInputStream("graph1.txt");


DataInputStream in = new DataInputStream(fstream);
BufferedReader b = new BufferedReader(new InputStreamReader(in));

String line;

try {
while ((line = b.readLine()) != null) {
StringTokenizer st = new StringTokenizer(line);

if(t.equals(st.nextToken()))
{
i++;

}
line = b.readLine();
System.out.println(line);
StringTokenizer st1 = new StringTokenizer(line);

if(v.equals(st1.nextToken()))
{

vv[0]=Integer.parseInt(st1.nextToken());
vv[1]=Integer.parseInt(st1.nextToken());
g[i].v.add(vv);
}
line = b.readLine();
StringTokenizer st2 = new StringTokenizer(line);

if(e.equals(st2.nextToken()))
{
ee[0]=Integer.parseInt(st2.nextToken());
ee[1]=Integer.parseInt(st2.nextToken());
ee[2]=Integer.parseInt(st2.nextToken());
g[i].e.add(ee);

}


}
} catch (IOException ex) {
Logger.getLogger(main.class.getName()).log(Level.S EVERE, null, ex);
}
} catch (FileNotFoundException ex) {
Logger.getLogger(main.class.getName()).log(Level.S EVERE, null, ex);
}

}}


Exception in thread "main" java.lang.NullPointerException

at main.main(main.java:64)

[KevinWorkman]

You tell us. What is the stack trace? Have you stepped through this wit ha debugger or at least added some print statements to figure out when the flow of the program differs from what you expect it to do?

When posting code, please use the CODE tags.

[Norm]

Exception in thread "main" java.lang.NullPointerException
at main.main(main.java:64)

What variable on line 64 has a null value?

[DarrylBurke]

shhhhh, don't double post and don't create more than one account. The other account you created has been banned and the double post has been locked.

db