/**
  * Represent a location in a rectangular grid.
  *
  * @author Yemima Sutanto
  * @version 1.0 (22 November 2018)
  */
 public class Location
 {
   // Row and column positions.
   private int row;
   private int col;
   /**
    * Represent a row and column.
    * @param row The row.
    * @param col The column.
    */
   public Location(int row, int col)
   {
     this.row = row;
     this.col = col;
   }
   /**
    * Implement content equality.
    */
   public boolean equals(Object obj)
   {
     if(obj instanceof Location) {
       Location other = (Location) obj;
       return row == other.getRow() && col == other.getCol();
     }
     else {
       return false;
     }
   }
   /**
    * Return a string of the form row,column
    * @return A string representation of the location.
    */
   public String toString()
   {
     return row + "," + col;
   }
   /**
    * Use the top 16 bits for the row value and the bottom for
    * the column. Except for very big grids, this should give a
    * unique hash code for each (row, col) pair.
    * @return A hashcode for the location.
    */
   public int hashCode()
   {
     return (row << 16) + col;
   }
   /**
    * @return The row.
    */
   public int getRow()
   {
     return row;
   }
   /**
    * @return The column.
    */
   public int getCol()
   {
     return col;
   }
 }