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POCalculating length in UTF-8 of Java String without actually encoding it
 

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    1. COIf your problem is raw speed, and not memory, are you sure that an ad-hoc function would be faster than `getBytes` + `length`? The current JREs have quite fast conversion routines implemented in native code.
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    2. COI'm concerned about memory pressure too, but the main concern is that large allocations could cause more garbage collection overhead. Rather than introducing a potential performance issue (that needs to be verified by profiling, of course), I thought I'd ask if there was a more specific API available. BTW, Oracle's JRE does not use native code for this: they allocate a worst-case byte array (`maxBytesPerChar`) and use an array-based implementation of CharsetEncoder (see `sun.nio.cs.UTF_8`).
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