The author of this book is yashwant kanetkar which is from india and is author of computer science he wrotes alot of books namely let us c, let us c+ and many more. one of them is let us java this book is about java programming in this book yashwant kanetkar uses important concept about java programming and he explained every concept in best way I have read this book and I learnt alot of concept from this book so you people also try to read this book if you want to become a good programmer. soft copies are avalible on internet