How to replace 2 or more spaces with a single space in String and how to delete leading and trailing spaces

Question

I want to replace multiple spaces with a single space.

For example:

if I have a String s= "Hello    Everyone". I want the output as "Hello Everyone". How to do this?

Answer 1

before=" Hello   world ";
String after = before.trim().replaceAll(" +", " ");

trim() function Returns a copy of the string, with leading and trailing whitespace omitted.