Use of the stringtokenizer class

 

Stringtokenizer is an application class used to separate strings. It is equivalent to the split function of VB.
1. Constructor
Public stringtokenizer (string Str)
Public stringtokenizer (string STR, string delim)
Public stringtokenizer (string STR, string delim, Boolean returndelims)
The first parameter is the string to be separated, the second is the delimiter character set combination, and the third parameter indicates whether the separator is returned as a mark. If no Delimiter is specified, the default value is: "\ t \ n \ r \ f"
2. Core Methods
Public Boolean hasmoretokens ()
Public String nexttoken ()
Public String nexttoken (string delim)
Public int counttokens ()
In fact, there are three methods. You can also specify the delimiter when the Delimiter is returned, and the last separator is used in the future.
3. Redundant Methods
Public Boolean hasmoreelements ()
Public Boolean hasmoreelements ()
This class implements the enumeration interface, so there is no need to implement these two methods.
Its name is stringtokenizer, and returning an object is meaningless.

 

Belongs to: Java. util package.

 

1. constructor.

 

1. stringtokenizer (string Str): constructs a stringtokenizer object used to parse Str. The default delimiter for Java is space, tab ('\ t'), line feed (' \ n'), and carriage return ('\ R ')".
2. stringtokenizer (string STR, string delim): constructs a stringtokenizer object used to parse STR and provides a specified separator.
3. stringtokenizer (string STR, string delim, Boolean returndelims): constructs a stringtokenizer object for parsing STR, provides a specified separator, and specifies whether to return a separator.

 

2. method.
Note:
1. All methods are public;
2. Writing format: [modifier] <return type> <method name ([parameter list])>
For example:
Static int parseint (string s) indicates that this method (parseint) is a class method (static), the return type is (INT), and the parameter required for the method is a string type.

 

1. Int counttokens (): the number of times the nexttoken method is called. If constructors 1 and 2 are used, the number of separators (Example 2) are returned ).
2. boolean hasmoretokens (): returns whether there are delimiters.
3. boolean hasmoreelements (): the result is the same as 2.
4. String nexttoken (): returns the string from the current position to the next separator.
5. Object nextelement (): the result is the same as 4.
6. String nexttoken (string delim): similar to 4, return results with the specified separator.

 

Example:
Code:
String S = new string ("the Java platform is the ideal platform for network computing ");
Stringtokenizer ST = new stringtokenizer (s );
System. Out. println ("token Total:" + st. counttokens ());
While (St. hasmoreelements ()){
System. Out. println (St. nexttoken ());
}
Result:
Token Total: 10
The
Java
Platform
Is
The
Ideal
Platform
For
Network
Computing

 

Example 2:
Code:
String S = new string ("the = Java = platform = is = The = ideal = platform = for = network = computing ");
Stringtokenizer ST = new stringtokenizer (S, "=", true );
System. Out. println ("token Total:" + st. counttokens ());
While (St. hasmoreelements ()){
System. Out. println (St. nexttoken ());
}
Result:
Token Total: 19
The
=
Java
=
Platform
=
Is
=
The
=
Ideal
=
Platform
=
For
=
Network
=
Computing

 

Use of the stringtokenizer class