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trim
public String trim()
Returns a copy of the string, with leading and trailing whitespace omi
tted.
If this String object represents an empty character sequence, or the f
irst and last characters of character sequence represented by this Str
ing object both have codes greater than '\u0020' (the space character)
, then a reference to this String object is returned.
Otherwise, if there is no character with a code greater than '\u0020' 
in the string, then a new String object representing an empty string i
s created and returned.
Otherwise, let k be the index of the first character in the string who
se code is greater than '\u0020', and let m be the index of the last c
haracter in the string whose code is greater than '\u0020'. A new Stri
ng object is created, representing the substring of this string that b
egins with the character at index k and ends with the character at ind
ex m-that is, the result of this.substring(k, m+1).
This method may be used to trim whitespace from the beginning and end 
of a string; in fact, it trims all ASCII control characters as well.
Returns:
A copy of this string with leading and trailing white space removed, o
r this string if it has no leading or trailing white space.


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