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threadsafe: Instance or static variables will never change asynchronously and so can use compiler optimizations such as assigning to registers. Next modifier -- final -- is also valuable to compilers
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final -- Cannot have a subclass for classes
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cannot be overridden for methods
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final variables have a constant value e.g.
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final int ageatdeath = 101;
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transient -- specifies that objects are not persistent
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Note most of these modifiers can be used either for a class or an object -- a particular instance of a class
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abstract only makes sense for a class and transient is perhaps more useful on an object basis
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