java.lang.Object | +----java.util.StringTokenizer
The string tokenizer class allows an application to break a
string into tokens. The tokenization method is much simpler than
the one used by the StreamTokenizer class. The
StringTokenizer methods do not distinguish among
identifiers, numbers, and quoted strings, nor do they recognize
and skip comments.
The set of delimiters (the characters that separate tokens) may be specified either at creation time or on a per-token basis.
An instance of StringTokenizer behaves in one of two
ways, depending on whether it was created with the
returnTokens flag having the value true
or false:
false, delimiter characters serve to
separate tokens. A token is a maximal sequence of consecutive
characters that are not delimiters.
true, delimiter characters are considered to
be tokens. A token is either one delimiter character, or a maximal
sequence of consecutive characters that are not delimiters.
The following is one example of the use of the tokenizer. The code:
StringTokenizer st = new StringTokenizer("this is a test");
while (st.hasMoreTokens()) {
println(st.nextToken());
}
prints the following output:
this
is
a
test
nextToken method can be called before it generates an
exception.
hasMoreTokens
method.
nextToken method,
except that its declared return value is Object rather than
String.
public StringTokenizer(String str,
String delim,
boolean returnTokens)
delim argument are the delimiters
for separating tokens.
If the returnTokens flag is true, then
the delimiter characters are also returned as tokens. Each
delimiter is returned as a string of length one. If the flag is
false, the delimiter characters are skipped and only
serve as separators between tokens.
public StringTokenizer(String str,
String delim)
delim argument are the delimiters
for separating tokens.
public StringTokenizer(String str)
"\t\n\r": the space character, the tab
character, the newline character, and the carriage-return character.
public boolean hasMoreTokens()
true if there are more tokens available from this
tokenizer's string; false otherwise.
public String nextToken()
public String nextToken(String delim)
public boolean hasMoreElements()
hasMoreTokens
method. It exists so that this class can implement the
Enumeration interface.
true if there are more tokens;
false otherwise.
public Object nextElement()
nextToken method,
except that its declared return value is Object rather than
String. It exists so that this class can implement the
Enumeration interface.
public int countTokens()
nextToken method can be called before it generates an
exception.
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