java - ArrayIndexOutOfBounds Exception in TicTacToe game -


i'm getting error don't realy understand why. tictactoe game(n x n) here table class 

public class table {  private int columns; private int rows; private int wincells; private piecetype[][] table;  public table() { }  public table(int rows, int columns, int wins) {     this.columns = columns;     this.rows = rows;     this.wincells = wins;     table = new piecetype[rows][columns];     fillempty(); } public void fillempty() {     (int = 0; < rows; ++i) {         (int j = 0; j < columns; ++j) {             table[i][j] = piecetype.none;         }     } }  public piecetype getelement(int i, int j) {     return table[i][j]; }

its getelement() method giving error after call function game.move(e.x, e.y);

public void widgetselected(selectionevent e) {         button button = (button) e.getsource();         moveresult moveresult = game.move(e.x, e.y);         if (game.getcurrentplayer().getpiecetype() == piecetype.cross)             button.settext("x");         else             button.settext("0");         switch (moveresult) {         case validmove: {             buttontable[griddata.horizontalindent][griddata.verticalindent]                     .settext("x");             game.changeplayer();         }         case winmatch:             disablebuttons();          case draw:             disablebuttons();         }

this x , y value

   (int = 0; < rows; ++i)         (int j = 0; j < cols; ++j) {              griddata.heighthint = 45;             griddata.widthhint = 45;              button button = new button(buttonpanel, swt.push);             button.setlayoutdata(griddata);             button.setdata(new cell(i,j));             buttontable[i][j] = button;             buttontable[i][j]                     .addselectionlistener(new buttselectionlistener());

any ideas on problem can be? game.move(e.x, e.y)? not calling properly?

stacktrace?:

exception in thread "main" java.lang.arrayindexoutofboundsexception: 0 @ backview.table.getelement(table.java:42) @ backview.game.move(game.java:56) @ frontview.maingui$buttselectionlistener.widgetselected(maingui.java:159) @ org.eclipse.swt.widgets.typedlistener.handleevent(unknown source) @ org.eclipse.swt.widgets.eventtable.sendevent(unknown source) @ org.eclipse.swt.widgets.widget.sendevent(unknown source) @ org.eclipse.swt.widgets.display.rundeferredevents(unknown source) @ org.eclipse.swt.widgets.display.readanddispatch(unknown source) @ frontview.maingui.<init>(maingui.java:55) @ main.main.main(main.java:18)

here method calling 

if(table.getelement(x, y) != piecetype.none) return moveresult.invalidmove;

you want cell button data , use i,j coordinates call getelement().

note: couple of comments on table class. default constructor doesn't make sense if know initial size of table. if case, make columns, rows , wincells final cannot modified during game. also, check coordinates provided in getelement() within array bounds:

public piecetype getelement(int i, int j) {     if ((i < 0) || (i >= rows) ||         (j < 0) || (j >= columns)) {         return null;     }      return table[i][j]; }

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