StackOverflow2013

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copied!<p>I've managed to be more concise and more clear but it still won't run... I just need a push over the edge and I'm home free. I've dumped so many wasted hours into this project:</p> <pre><code>public ArrayList<Integer> needAtLoc(int r, int c){ int bc=c/3;//the column within the SudokuBoard int blc; /*The two posibilities for the column within each SudokuBlock:*/ if(c>=0 && c<3) { blc=c; } else { blc=c%3; } int br=r/3; //the row within the SudokuBoard int blr; /*The two possiblities for the row within each SudokuBlock:*/ if(r>=0 && r<3) { blr=r; } else { blr=r%3; } ArrayList<Integer> needR = new ArrayList<Integer>(); needR=checkR(r);// needR.trimToSize(); System.out.println(needR);////////////// ArrayList<Integer> needC=new ArrayList<Integer>(); needC=checkC(c); needC.trimToSize(); System.out.println(needC);///////////// ArrayList<Integer> needBl=new ArrayList<Integer>(); needBl=this.board[br][bc].updateMissing(); //that method updates and returns an ArrayList needBl.trimToSize(); ArrayList<Integer> poss=new ArrayList<Integer>(); poss.clear(); for(Integer e: needBl){ if(needC.contains(e) && needR.contains(e)){ poss.add(e); } } return poss; } //this method throws the StackOverflowError public void play(int r, int c){ int bc=c/3; //the column within the SudokuBoard int blc; /*The two posibilities for the column within each SudokuBlock:*/ if(c>=0 && c<3) { blc=c; } else { blc=c%3; } int br=r/3; //the row within the SudokuBoard int blr; /*The two possiblities for the row within each SudokuBlock:*/ if(r>=0 && r<3) { blr=r; } else { blr=r%3; } if(needAtLoc(r,c).size()==9){ int num=1+generator.nextInt(9); this.board[br][bc].setValue(blr, blc, num); if(c<8){ System.out.println(this);/////////////// play(r, c+1); } else{ play(r+1, 0); } } else{ if(needAtLoc(r,c).size()==0){ //no possible moves if(c>0){ bc=(c-1)/3; if(c>0 && c<4) { blc=c-1; } else { blc = (c-1) % 3; } this.board[br][bc].setValue(blr, blc, 0); play(r, c-1); } else{ blc=0; bc=0; if(r==0){ blr=0; br=0; this.board[br][bc].setValue(blr, blc, 0); play(r,c); } else{ br=(r-1)/3; if(r>0 && r<4) {blr=r-1;} else {blr=(r-1)%3;} this.board[br][bc].setValue(blr, blc, 0); play(r-1, 8); } } } else{//if there are possible moves int num=needAtLoc(r,c).remove(generator.nextInt(needAtLoc(r,c).size())); this.board[br][bc].setValue(blr, blc, num); System.out.println(this);////////////// if(r==8 && c==8){ return; } else{ if(c<8){ play(r, c+1); } else{ play(r+1, 0); } } } } } </code></pre>

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