Removing whitespace from strings in Java

Question

I have a string like this:

mysz = "name=john age=13 year=2001";

I want to remove the whitespaces in the string. I tried trim() but this removes only whitespaces before and after the whole string. I also tried replaceAll("\W", "") but then the = also gets removed.

How can I achieve a string with:

mysz2 = "name=johnage=13year=2001"

question from:https://stackoverflow.com/questions/65901667/numberformatexception-in-integer-valueofstring-string-to-random-int-to-strin

Answer 1

st.replaceAll("\s+","") removes all whitespaces and non-visible characters (e.g., tab, ).

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st.replaceAll("\s+","") and st.replaceAll("\s","") produce the same result.

The second regex is 20% faster than the first one, but as the number consecutive spaces increases, the first one performs better than the second one.

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Assign the value to a variable, if not used directly:

st = st.replaceAll("\s+","")