What are these and what are they useful for?: and

I have seen these symbols being used in Java: << and >>, what are they and what do they do?
Thank you.

As DrQuincy asks how is this of use over multiplying
and dividing?In your processor there are often different instructions for shifting, multiplying, and deleteing. Typically the shifting instructions take less time to execute and so using the shifting operator will be faster than multiplying. This assumes the compiler doesn't recognize the situation and optimize it out though.
The >>,<<,>>>, &,|,and ^ operators are mainly useful when you need to deal with individual bits of data. For instance if you are talking to another system (thats not java) that uses a different method of storing numbers (little endian/big endian etc.), or doing something such as creating parity data for error correction. There are lots of things to do, but most a low level and its rare when you need to use them.

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