A method like the trim method of string in the spring framework

@Test Public voidTesttrimwhitespace ()throwsException {assertequals (NULL, Stringutils.trimwhitespace (NULL)); Assertequals ("", Stringutils.trimwhitespace ("" ")); Assertequals ("", Stringutils.trimwhitespace ("" ")); Assertequals ("", Stringutils.trimwhitespace ("\ t")); Assertequals ("A", Stringutils.trimwhitespace ("a")); Assertequals ("A", Stringutils.trimwhitespace ("a")); Assertequals ("A", Stringutils.trimwhitespace ("a")); Assertequals ("A B", Stringutils.trimwhitespace ("a B")); Assertequals ("A b C", Stringutils.trimwhitespace ("a b C")); Assertequals ("A b C", Stringutils.trimwhitespace ("\r\f\n a b c \ t")); }

You can see that this method can handle

\ n Enter (\u000a)   
\ t Horizontal tab (\U0009)   
\ r line Break (\u000d)   
\f Page Change (\u000c)   

In fact, with the Java string method of trim can achieve the same function

    /*** Trim leading and trailing whitespace from the given String. * @paramstr the String to check *@returnThe trimmed String *@seeJava.lang.character#iswhitespace*/     Public Staticstring Trimwhitespace (String str) {if(!haslength (str)) {            returnstr; } StringBuilder SB=NewStringBuilder (str);  while(Sb.length () > 0 && character.iswhitespace (Sb.charat (0)) {Sb.deletecharat (0); }         while(Sb.length () > 0 && character.iswhitespace (Sb.charat (Sb.length ()-1)) {Sb.deletecharat (sb.length () ))-1); }        returnsb.tostring (); }

    /*** Check The given String is neither {@codenull} Nor of length 0. * Note:will return {@codetrue} for a String, that purely consists of whitespace. * @paramstr the String to check ( could be {@codenull}) * @return {@codetrue if the String is not null and have length *@see#hasLength (charsequence)*/     Public Static Booleanhaslength (String str) {returnhaslength ((charsequence) str); }

    /*** Check The given charsequence is neither {@codenull} Nor of length 0. * Note:will return {@codetrue} for a charsequence that purely consists of whitespace.     * <p><pre class= "code" > * STRINGUTILS.HASLENGTH (NULL) = False * Stringutils.haslength ("") = False * Stringutils.haslength ("") = True * Stringutils.haslength ("Hello") = True * </pre> *@paramstr the charsequence to check ( could be {@codenull}) * @return {@codetrue} if the charsequence is not null and have length *@see#hasText (String)*/     Public Static Booleanhaslength (charsequence str) {return(str! =NULL&& str.length () > 0); }

A method like the trim method of string in the spring framework