Core Java tutorials.
Various individual objects might be found of same kind, in real work. Thousands of similar bicycles might be present in world that have similar model or make. Same components or same blueprints set are used to build bicycles.
Bicycle may be considered as class bicycle instance, in case of the object oriented programming. Class is basically the blue print which is involved in creation of the individual objects.
This given Bicycle class is the possible bicycle implementation: