Create HelloWorld class
Update HelloWorld class
The Bicycle class

Signed-off-by: chaiwat-k <chaiwat.kanchanarat@gmail.com>
Refactor to AbstractBicycle
int
Primitive data types
Literals
Array
Controll-Switch
shift opt
while, do-while
unlabeled break
unlabeled break;
Constructors
Parameter passing
aceess
Introducing Shapes
Inner class
Anonymous class
Passing functionality as argument using Anonymous class