The Java IO - Any form or structure?

People,
Here I come again, perplexed. With so many Java IO classes, I do not know when to use what. So then, I just ask: Is there any logical categorization of the IOs so that I will be able to, for instance, know when to use DataInputStream instead of FileInputStream?
Input stream, output stream, data stream, byte stream, binary stream, file stream and still so many streams. What exactly does a stream mean in Java?
No redirection to the JDK Documentation. If I could articulate the points in it, I wouldn't bring these questions to the forum.
Thanks,
ue_Joe.

Thanks for the confirmation. It is good to know the basis of somethings. I am learning Java as part of my academic requirements. I started learning it in May 2007. I have made a lot of efforts to learn, but with little progress so far. This doesn't make me feel good. I am reading a Java book, learning the elements and syntax of the language. Many of the contexts are so far difficult for me to comprehend which doesn't make me feel good either. I am close to forty and back to school to get a new education, a new set of skills for a chance at a better life. I have forgone many things that are dear to me. I must learn this new skill and learn it right. To do otherwise will be suicidal.
People of the forum, do bear with me.
ue_Joe

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