THE PACKAGE JAVA.LANG
java.lang.String
20.12
20.12.36
public String toUpperCase()
If this
String
 object does not contain any character that is mapped to a different
character by the method
Character.toUpperCase
 ( 20.5.21), then a reference
to this
String
 object is returned. Otherwise, this method creates a new
String
object representing a character sequence identical in length to the character
sequence represented by this
String
 object and with every character equal to the
result of applying the method
Character.toUpperCase
 to the corresponding
character of this
String
 object.
Examples:
"Fahrvergn gen".toUpperCase()
returns
 "FAHRVERGNUGEN"
"Visit Ljubinje!".toUpperCase()
returns
 "VISIT LJUBINJE!"
20.12.37
public String trim()
If this
String
 object represents an empty character sequence, or the first and last
characters of character sequence represented by this
String
 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 is created and
returned.
Otherwise, let
k
 be the index of the first character in the string whose code is
greater than
\u0020
, and let
m
 be the index of the last character in the string
whose code is greater than
\u0020
. A new
String
 object is created, representing
the substring of this string that begins with the character at index
k
 and ends with
the character at index
m
 that is, the result of
this.substring(k, m+1)
.
This method may be used to trim whitespace ( 20.5.19) from the beginning
and end of a string; in fact, it trims all ASCII control characters as well.
20.12.38
public static String valueOf(Object obj)
If the argument is
null
, then a string equal to
"null"
 is returned. Otherwise, the
value of
obj.toString()
 is returned. See the
toString
 method ( 20.1.2).
545






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