android - Array problems - Source not found -

hey guys have got following problem:

i trying create new array code.

public class minefield {  mine[][] mines;  public minefield(int cols, int rows) {     mines = new mine[cols][rows]; } } 

so when executing code runs fine of course. when add single line:

mines[0][0].setcoordinates(0,0); 

the debug perspective opens , gives me "activitythread.performlaunchactivity(activitythread$activityclientrecord, intent) line 2180

and text in red "source not found"

i working on android application.

but not able find out why can't call method of object out of freshly created object array? trying create 2 dimensional array of mines , giving every single mine specific coordinates.

do know solutions or alternatives, let me know!

thanks in advance!

you getting nullpointerexception because mines[0][0] null should initialize mine.

i.e

mines[0][0]=new mine(); 

and then

mines[0][0].setcoordinates(0,0);