java interview question - replace space with %20 in java - 1(2) [cracking the coding interview ]

as far as the performance is concerned, the replace() method is a bit faster than replaceAll() because the later first compiles the regex pattern and then matches before finally replacing whereas the replace simply matches for the provided argument and replaces.

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[siddharthbhagwat]

The interviewer will surely ask you to write your own logic for solving the program rather than just using the inbuilt functionality of the language.