Re: [chuck-users] NullPointerException

There was some time since I used Chuck now, so I may be wrong on this one. But I get the feeling that you're not initializing l, right?

That's what I thought at first with the original code but with the code below every object contained in l is automatically initialised when the list is declared. That's why after Item l[n], print() is called all items and each object's float is printed to stdout.

On 10/06/07, eduard aylon wrote:

...

Hi list,

I am trying to make a list of objects where each object has references to other objects, but I am not succeeding and I get a NullPointerException. The piece of code below may represent what I am trying to do.

class object { Std.rand2f(0., 1.) => float f_; }

class Item extends object { 2 => int size_; object item_[size_];

fun void print() { for( 0=>int i; i>>; } <<<"----------------------------------------------">>>; <<<"calling print from within class definition">>>; <<<"----------------------------------------------">>>; print(); }

4 => int n; Item l[n];

// no problems up until here

<<<"----------------------------------------------">>>; <<<"calling print from outside class definition">>>; <<<"----------------------------------------------">>>;

for( 0=>int i; i

After execution I get: [chuck](VM): NullPointerException: shred[id=1:test.ck], PC=[37]

Excuse me if it's too obvious, but I can't see why it rises the null pointer exception. Any ideas?

thanks in advance,

eduard

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