// Overview: The class captures the attributes and functionalities of
// a move in the game of checkers. The attributes include the position
// of a particular piece (respresented as a row and column identifier)
// and the destination of the move (also represented as a row and a
// column).

// Assumptions: It is assumed that the move is legal.

public class CheckersMove{
        // Attributes 
        private int fromRow,fromCol;  // Position of piece to be moved.
	private int toRow, toCol;      // Square it is to move to.
	
        // Methods 

        // Constructor: Just set the values of the instance variables.
        CheckersMove(int r1, int c1, int r2, int c2) {
	    fromRow = r1;
	    fromCol = c1;
	    toRow = r2;
	    toCol = c2;
	} // end CheckersMove() 
	public boolean isJump() {
	    // Test whether this move is a jump. The difference between 
            // that and a normal move is, in a jump, the piece moves two
	    // rows.
	    return (fromRow - toRow == 2 || fromRow - toRow == -2);
	} //end isJump()
        
        // The accessors

        // Get the row identifier of the current position
        public int getfromRow(){
	    return fromRow;
        } //end getfromRow

        // Get the column identifier of the current position
        public int getfromCol(){
	    return fromCol;
        } // end getfromCol()

        // Get the row identifier of the destination position
        public int gettoRow(){
	    return toRow;
        } // end gettoRow()

        // Get the column identifier of the destination position  
        public int gettoCol(){
	    return toCol;
        } // end gettoCol()

}  // end class CheckersMove.