java - How to remove duplicates from string (not array) without using StringBuilder? -

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i working program , need remove repeated characters string given me user. referenced other questions, using stringbuilder remove duplicates. however, there way remove duplicates without turning string array, using stringbuilder , set?

i haven't learnt yet, don't understand them well. help?

for example, if user types in happyrolling result should hapyroling.

it seems example want remove repeated characters (not words).

you can use regex find repeats , remove them:

str = str.replaceall("(.)\\1+", "$1");

this regex captures every character matches when followed same character using reference captured group. replacement captured character, example "xx" replaced "x"


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