字串變為字元陣列：
public
char tochararray()
public
string(char value)
public
string(char value,int offset,int count)
public
char
charat(int index)
public
byte getbytes()
public
string(byte bytes)
public
string(byte bytes, int offset, int length)
public
intlength()
thefirst occurrence of
thecharacter
inthe
character sequence represented by this object, or -1
ifthe
character
does
not occur.
public int indexof(int ch, int fromindex)
the index of
thefirst occurrence of
thecharacter
inthe
character sequence represented by this object that
isgreater than
orequal
to fromindex, or -1
ifthe
character
does
not occur.
public int lastindexof(int ch)
the index of
thelast occurrence of
thecharacter
inthe
character sequence represented by this object, or -1
ifthe
character
does
not occur.
public int lastindexof(int ch,int fromindex)
the index of
thelast occurrence of
thecharacter
inthe
character sequence represented by this object that
isless than or equal
to fromindex, or -1
ifthe
character
does
not occur before
that point.
public
string
trim()
public string substring(int beginindex)
public string substring(int beginindex, int endindex)
public
string split(string regex)
public
string split(string regex,int limit)
public string tolowercase()public string touppercase()public
boolean
startswith(string prefix)
public
boolean
endswith(string suffix)
public
boolean
equals(object anobject)
public
boolean
equalsignorecase(string anotherstring)
by replacing every occurrence of oldchar with newchar.
public string replace(charsequence target,
charsequence replacement)
replaces each substring of this string
that matches the literal target sequence with
the specified literal replacement sequence. the replacement proceeds from
thebeginning
ofthe
string
tothe
end, for example, replacing "aa"
with
"b"in
thestring
"aaa" will result
in"ba" rather than "ab".
public string replaceall(string regex,
string replacement)
replaces each substring of this string
that matches the
given regular expression with
thegiven replacement.
public string replacefirst(string regex,
string replacement)
replaces the
first substring of this string
that matches the
given regular expression with
thegiven replacement.
還是檢視api文件靠譜，省時省力，而且是第一手資料。
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