How Can I Efficiently Remove Whitespace from Strings in Java?

Removing Whitespace from Strings in Java

One common task in string manipulation is removing whitespace, including both visible (e.g., spaces) and invisible (e.g., tabs, newlines) characters. To achieve this in Java, several approaches are available.

Using the trim() Method:

The trim() method removes whitespace characters from both ends of a string. However, it does not remove whitespace from within the string. For instance, in the provided example:

String mysz = "name=john age=13 year=2001";
String myszTrimmed = mysz.trim();

myszTrimmed will be "name=john age=13 year=2001" (with no whitespace at the beginning or end).

Using Regular Expressions (Regex):

To remove whitespace from within the string, regular expressions can be used. The replaceAll("\W","") approach mentioned in the question will not work because it also removes the "=" characters. Instead, use the following regex:

String mysz2 = mysz.replaceAll("\s+","");

Here, \s matches one or more consecutive whitespace characters. Removing all whitespace and non-visible characters will result in the desired string: "name=johnage=13year=2001".

For performance optimization, consider assigning the result to a variable instead of using it directly:

mysz = mysz.replaceAll("\s+", "");

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