Q:

Java 2dim table for-iteration

I'm writing a 'Sudoku' program, and I need to write a method to check whether a number, the user wants to insert in a certain cell is already contained by the row, column or region. My code looks like this(I'm only checking the row for the number at this point, setNumber returns a boolean value indicating whether the number can be inserted or not):
public boolean setNumber(int row, int column, int number) {  
    if (this.isEmpty(row, column)) {  
     if (!this.rowContains(row, number)) {  
      return true;  
     } else {  
      return false;  
     }  
    } else {  
     return false;  
    }  
  }  

  private boolean rowContains(int row, int number) {  
   for (int i=0; i < this.cells[row].length; i++) {  
    if (this.cells[row][i].getNumber() == number) {  
     return true;  
    }  
   }  
   return false;  
}  

Now, the same number can be inserted multiple times, so apparently rowContains always returns false, but why?

A:

If setNumber is not a misnomer for canSetNumner I would expect it to contain a
cells[row][column].setNumber(number);

line just before the
return true;

