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This means that, in the real world, Java is often faster than C++, even on standard measures of latency. And even where it is not, the difference in latency between the languages is often swamped by other factors, or is nowhere near large enough to make a difference, even in high-frequency trading.
Java didn't have the same goals and so doesn't serve the same function as C++. In other words, Java may have made some improvements, but also some regressions in things that are important for C++ applications. Therefore Java cannot simply replace C++.
C++ to Java: 1 week. Java to C++: 1 month.
For a person with no prior programming experience, it is expected approximately 9 months, that is 5+3+1 months to completely understand and write Java programs.
I moved from C++ to Java 6 years ago an used "Effective Java" by Bloch, this is a style book which explains in 50 short articles how best to use various java classes and techniques. This is very similar to "Effective C++" by Meyers and "Exceptional C++" by Sutter.
If you already know C++ and object oriented programming and can read Java this is the fastest way to write good quality java code.
There is a new edition out now with generics etc. In my mind this book is essential for all Java programmers as well as those wanting to learn Java.
The Java Tutorial.
It is kept up to date and well written. Also available in hard-copy.
I'm always skeptical about "change from X to Y" guides. Though they may help as reference points afterwards, learning a new language by coming from another one may be tricker than you think.
I think it is important to learn the new language "as designed" and to get the feel for the way to things "right" in this language and also learning its code idioms.
As a good book for experienced programmers who also want to learn about potential pitfalls of Java, I recommend Effective Java.
O'Reilly's 'Head First' books are very well written. Take a look at Head First Java and Head First Design Patterns.
I made this transition in 1996 or so when Java was newish. A book will definitely help. I used Laura Lemay's 21 day book, which is now up to rev 6. It took me 3 days to get through the original book and another week before I felt I was fully conversant.
Things to get used to:
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