This is my code:
class MemberRec{
public String name;
publicstaticvoid initialise(String line, MemberRec[] member){
String line = line.split("\\s+");
member[i].name = items[0];
}
};
In the main it reads the first line from a file, and passes it here. The code compiles alright, but when i run it it gives me a NullPointerException error.
Can anyone help? Thnx.
In my experience noobs believe the below will automagically generate ten objects and store them in the array for them. So my money is one the array being empty.
Object[] obj = new Object[10];
Yeah, but seeing more code would help find the problem.
Message was edited by:
flounder
Ok well this is how i'm declaring the array:
MemberRec member[] = new MemberRec[num]
//num is a final static int equal to 300
Then i'm calling the function from the main like this:
MemberRec.initialise(line, member);
> Ok well this is how i'm declaring the array:
>
> MemberRec member[] = new MemberRec[num]
>
> //num is a final static int equal to 300
You now have an array of 300 references to MemberRec. Each of those references is null. You would need to do something like this: for (int ix = 0; ix < member.length; ix++) {
member[ix] = new MemberRec(); \
}
> Then i'm calling the function from the main like
> this:
>
> MemberRec.initialise(line, member);
If you haven't initialized the elements of the array, and you try to access member[ix].someMethodOrVariable, you'll get the NPE you're observing.
The lineMemberRec member[] = new MemberRec[num]
creates an array of MemberRecs all of which are null. Later, when you refer to
member[i].name you will get the NullPointerException. You have to initialise
all the elements of the array. Like thisMemberRec member[] = new MemberRec[num];
for(int i = 0; i < num; i++) {
member[i] = new MemberRec();
}
This assumes that flounder's crystal balls aren't playing up and that the NPE
occured with member[i].name. Some compilable code really would settle
the matter. Really.
Ok i have a new problem now, lol.
I'm trying to get the program to read along a line of char's in a file, into an array, and when the integer it reads is "0", it stops looping.
for(;;) {
if (items[j]=="0") break;
member[i].array[k] = Integer.valueOf(items[j]);
j++;
k++;
}
The problem its having is that when it reads "0" its not stopping, and the next character in the line is of a different variable type, so the compiler is havin a cry to me.
