Am just 6 months old to Tridion. I know the basic stuff related to this tool. I read somewhere saying we can enhance the functionalities of Content Delivery by extending it using some Java APIs.
Could someone guide me where can we get these Java API's from. It would be great if you can quote some examples for this.
Apart from the official documentation (http://sdllivecontent.sdl.com/LiveContent/content/en-US/SDL_Tridion_2011_SPONE/concept_35CC2F9DCEA34995931E181C165FCC0F, login required) there is an excellent series of articles on the topic by Mihai Cadariu: http://www.sdltridionworld.com/articles/sdltridion2011/tutorials/extending-content-delivery-storage-sdltridion-2011-1.aspx.
I suggest you start from there and let us know if you have more specific questions!