This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
I have a java file -- "Hello.java" in this folder structure D:\examples\src
Also, there is a folder "classes" along with src in the same structure.
My question is, how do I make those .class files to get into "classes" folder using javac -d ??
Why have you got that structure inthe first place? Are you using an IDE at this early stage? That is usually a mistake. Make yourself a “java” folder, as described here, and you can make subfolder as required. Using the folder structure from an IDE is a sure-fire recipe for confusion.