Date: 2014oct19 Language: java Level: beginner Q. Java: change all whitespace into underscores in a String A. Here is a nice way to clean a string:

s = s.trim().replaceAll("\\s+", "_");

trim() removes leading and trailing whitespace (tab, space, newline) characters. Then the replaceAll("\\s+","_") converts any run of whitespace into a underscore.