Improve your Java code performance

1. JDK 1.5 and above provide some new features to replace some old implementations:

• StringBuilder is a replacement of StringBuffer

StringBuffer instances are almost always used by a single thread,yet they perform

internal synchronization. It is for this reason that was essentially replaced by StringBuilder,

which is an unsynchronized

• Vector and ArrayList, if you create and modify the Vector within a method, ArrayList

will have better performance

2. If you only need read data from a collection, Collections.unmodifiable() will return the read-only view of

the passed in colleciton, you don't need to create a copy of the data, and you will consume less memory,

make less impact on garbage collector, and make the program faster.

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