Use Native Methods

Use Native Methods

When processing strings, don't hesitate to use specialty methods like String.indexOf(), String.lastIndexOf(), and their cousins. These are typically implemented in C/C++ code that easily runs 10-100x faster than doing the same thing in a Java loop.
The flip side of that advice is that punching through to a native method is more expensive than calling an interpreted method. Don't use native methods for trivial computation, if you can avoid it.

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