nullpointer exception when assigning values

[oll3i]

[code=java]
public void wczytajPlik(Str ing sciezka) throws FileNotFoundExc eption
{
wczytaneDane.se tText("");
BufferedReader br = new BufferedReader( new FileReader(scie zka));
String line = null;
String[] rows_cols = null;
try {
line = br.readLine();
rows_cols = line.split("\\s +");
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTra ce();
}

int rows=new Integer(rows_co ls[0]);
int cols=new Integer(rows_co ls[1]);
wczytaneDane.ap pend("Liczba wierszy:"+rows+ "\n");
wczytaneDane.ap pend("Liczba kolumn:"+cols+" \n");
klasyfikatorBay esa = new KlasyfikatorBay esa(cols-1,rows);
System.out.prin tln("Kolumny i wiersze ustawione\n"+"l ine="+line);

int lineNumber=0;

String[] aktualnyWiersz= null;
Integer valueRowColumn = null;
try {
while((line = br.readLine()) != null) {
aktualnyWiersz = line.split("\\s +");


for(int i=0;i<aktualnyW iersz.length-1;i++){

///int valueInt = new Integer(aktualn yWiersz[i]).intValue();
try {
valueRowColumn = new Integer(aktualn yWiersz[i]);
} catch (NumberFormatEx ception ignored) {


klasyfikatorBay esa.dane_trenin gowe[lineNumber][i]=valueRowColumn ;
}


}
System.out.prin tln(lineNumber+ "line="+lin e);
wczytaneDane.ap pend(lineNumber +")"+line+"\n") ;
lineNumber++;
}

System.out.prin tln("Dane treningowe wczytane");
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTra ce();
}

}

[/code]


for(int i=0;i<liczbaCol umn;i++){
System.out.prin tln("dane_treni ngowe[aktualny_wiersz][i]"+dane_treningo we[aktualny_wiersz][i]);
wiersz_analizow any[i]=dane_treningow e[aktualny_wiersz][i];
}

when i do System.out.prin tln wiersz_analizow any[i] is null
klasyfikatorBay esa.dane_trenin gowe[lineNumber][i]=valueRowColumn ; assigns null ? when i convert it to integer valueRowColumn = new Integer(aktualn yWiersz[i]); it returns NumberFormatExc eption


thank YOU

[r035198x]

Here are some tips.
1.) Define variables closet to where you're using them.
2.) Ignoring exceptions is not the in-thing to do.
3.) NumberFormatExc eption is what it says. You are trying to convert an inconvertible value. Print it to console and see what it is.

[oll3i]

i need to convert aktualnyWiersz[i] to Integer so i can assign value
klasyfikatorBay esa.dane_trenin gowe[lineNumber][i]=valueRowColumn ;
which is public Integer[][] dane_treningowe ;

how do i conver String to Integer?

[oll3i]

Integer valueRowColumn = Integer.valueOf (aktualnyWiersz[i]); throws number format exception

[r035198x]

i need to convert aktualnyWiersz[i] to Integer so i can assign value
klasyfikatorBay esa.dane_trenin gowe[lineNumber][i]=valueRowColumn ;
which is public Integer[][] dane_treningowe ;

how do i conver String to Integer?

Use Integer.parseIn t but you'll get an exception if the value being passed is not an integer.