Answer Posted / reddy

The purpose of interface is to have abstract methods and
the class which implemnts the interface has to define the
methods in the interface.
The reason why java collections have both interfaces and
classes is interface will have common methods which will be
needed by one or many classes. The classes which wants to
behave like this interface will implement this interface
and define methods in the interface.

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For ease of programming you can consider the maze as a 2D array with colors represented by below integer and characters (in capital letters). • B - Black • W -White • G- Green • R- Red R B W B W W W W W W B W B B W W W W W W W B W B W W W B W W W W B B W W W B W W W B W W B B B B W B W B W W B W W W B W W W B B B W W B W W W B W W B W B W W W B W B W W W W B B W W W W B W W W W W G Shortest Route Problem: • Solution that finds the shortest Route between Red and Green  White will have 1 Weight.  Red and Green carry no weights.  Shortest path is the path with less weight when you add up the weights in the path.

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