accessing to a public method in library from processing

cidelab

accessing to a public method in library from processing

in Library and Tool Development • 1 year ago

hello to all.

I'm working in a class library for processing, but when I try to access to a public method in the library from processing

I got the error: NullPointerException .

what I'm doing wrong.?

any help will be greate.!

thanks in advance.

this is what I have in Eclipse:

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package Laga;
import processing.core.*;
public class Crosscountry
{
PApplet myparent;
public char[][] SonPop;
public Crosscountry(PApplet parent){
myparent = parent;
}
public void SingleSongCountry(){
SonPop = new char[10][10];
for(int j = 0; j < 10; ++j){
for(int i = 10; ++i){
SonPop[j][i] = "s";
}
}
}
}

And this is the code in processing:

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import Laga.*; //import the library...
Crosscountry crossPop;
char[][] inhPop;
void setup()
{
size(500, 800);
smooth();
crossPop = new Crosscountry(this);
crossPop.SingleSongCountry(); //the error happend here.
inhPop = crossPop.SonPop;
}

Regards

Replies(1)

PhiLho

Re: accessing to a public method in library from processing

1 year ago

I don't see why you get an NPE, but the syntax of the the second for loop is strange.
for(int i = 10; ++i){
It shouldn't even compile!
Actually, the next line, SonPop[j][i] = "s"; shouldn't compile either, as you put a string in a char location.