1 *java.util.StringTokenizer* *StringTokenizer* The string tokenizer class allows
3 public class StringTokenizer
4 extends |java.lang.Object|
5 implements |java.util.Enumeration|
7 |java.util.StringTokenizer_Description|
8 |java.util.StringTokenizer_Fields|
9 |java.util.StringTokenizer_Constructors|
10 |java.util.StringTokenizer_Methods|
12 ================================================================================
14 *java.util.StringTokenizer_Constructors*
15 |java.util.StringTokenizer(String)|Constructs a string tokenizer for the specif
16 |java.util.StringTokenizer(String,String)|Constructs a string tokenizer for the
17 |java.util.StringTokenizer(String,String,boolean)|Constructs a string tokenizer
19 *java.util.StringTokenizer_Methods*
20 |java.util.StringTokenizer.countTokens()|Calculates the number of times that th
21 |java.util.StringTokenizer.hasMoreElements()|Returns the same value as the hasM
22 |java.util.StringTokenizer.hasMoreTokens()|Tests if there are more tokens avail
23 |java.util.StringTokenizer.nextElement()|Returns the same value as the nextToke
24 |java.util.StringTokenizer.nextToken()|Returns the next token from this string
25 |java.util.StringTokenizer.nextToken(String)|Returns the next token in this str
27 *java.util.StringTokenizer_Description*
29 The string tokenizer class allows an application to break a string into tokens.
30 The tokenization method is much simpler than the one used by the
31 StreamTokenizer class. The StringTokenizer methods do not distinguish among
32 identifiers, numbers, and quoted strings, nor do they recognize and skip
35 The set of delimiters (the characters that separate tokens) may be specified
36 either at creation time or on a per-token basis.
38 An instance of StringTokenizer behaves in one of two ways, depending on whether
39 it was created with the returnDelims flag having the value true or false:
41 If the flag is false, delimiter characters serve to separate tokens. A token is
42 a maximal sequence of consecutive characters that are not delimiters. If the
43 flag is true, delimiter characters are themselves considered to be tokens. A
44 token is thus either one delimiter character, or a maximal sequence of
45 consecutive characters that are not delimiters.
47 A StringTokenizer object internally maintains a current position within the
48 string to be tokenized. Some operations advance this current position past the
49 characters processed. A token is returned by taking a substring of the string
50 that was used to create the StringTokenizer object.
52 The following is one example of the use of the tokenizer. The code:
54 StringTokenizer st = new StringTokenizer("this is a test"); while
55 (st.hasMoreTokens()) { System.out.println(st.nextToken()); }
57 prints the following output:
61 StringTokenizer is a legacy class that is retained for compatibility reasons
62 although its use is discouraged in new code. It is recommended that anyone
63 seeking this functionality use the split method of String or the
64 java.util.regex package instead.
66 The following example illustrates how the String.split method can be used to
67 break up a string into its basic tokens:
69 String[] result = "this is a test".split("\\s"); for (int x=0; x<result.length;
70 x++) System.out.println(result[x]);
72 prints the following output:
78 *java.util.StringTokenizer(String)*
80 public StringTokenizer(java.lang.String str)
82 Constructs a string tokenizer for the specified string. The tokenizer uses the
83 default delimiter set, which is "tnrf": the space character, the tab character,
84 the newline character, the carriage-return character, and the form-feed
85 character. Delimiter characters themselves will not be treated as tokens.
87 str - a string to be parsed.
89 *java.util.StringTokenizer(String,String)*
91 public StringTokenizer(
93 java.lang.String delim)
95 Constructs a string tokenizer for the specified string. The characters in the
96 delim argument are the delimiters for separating tokens. Delimiter characters
97 themselves will not be treated as tokens.
99 Note that if delim is null, this constructor does not throw an exception.
100 However, trying to invoke other methods on the resulting StringTokenizer may
101 result in a NullPointerException.
103 str - a string to be parsed.
104 delim - the delimiters.
106 *java.util.StringTokenizer(String,String,boolean)*
108 public StringTokenizer(
109 java.lang.String str,
110 java.lang.String delim,
111 boolean returnDelims)
113 Constructs a string tokenizer for the specified string. All characters in the
114 delim argument are the delimiters for separating tokens.
116 If the returnDelims flag is true, then the delimiter characters are also
117 returned as tokens. Each delimiter is returned as a string of length one. If
118 the flag is false, the delimiter characters are skipped and only serve as
119 separators between tokens.
121 Note that if delim is null, this constructor does not throw an exception.
122 However, trying to invoke other methods on the resulting StringTokenizer may
123 result in a NullPointerException.
125 str - a string to be parsed.
126 delim - the delimiters.
127 returnDelims - flag indicating whether to return the delimiters as tokens.
129 *java.util.StringTokenizer.countTokens()*
131 public int countTokens()
133 Calculates the number of times that this tokenizer's nextToken method can be
134 called before it generates an exception. The current position is not advanced.
138 Returns: the number of tokens remaining in the string using the current delimiter set.
140 *java.util.StringTokenizer.hasMoreElements()*
142 public boolean hasMoreElements()
144 Returns the same value as the hasMoreTokens method. It exists so that this
145 class can implement the Enumeration interface.
149 Returns: true if there are more tokens; false otherwise.
151 *java.util.StringTokenizer.hasMoreTokens()*
153 public boolean hasMoreTokens()
155 Tests if there are more tokens available from this tokenizer's string. If this
156 method returns true, then a subsequent call to nextToken with no argument will
157 successfully return a token.
161 Returns: true if and only if there is at least one token in the string after the current
162 position; false otherwise.
164 *java.util.StringTokenizer.nextElement()*
166 public |java.lang.Object| nextElement()
168 Returns the same value as the nextToken method, except that its declared return
169 value is Object rather than String. It exists so that this class can implement
170 the Enumeration interface.
174 Returns: the next token in the string.
176 *java.util.StringTokenizer.nextToken()*
178 public |java.lang.String| nextToken()
180 Returns the next token from this string tokenizer.
184 Returns: the next token from this string tokenizer.
186 *java.util.StringTokenizer.nextToken(String)*
188 public |java.lang.String| nextToken(java.lang.String delim)
190 Returns the next token in this string tokenizer's string. First, the set of
191 characters considered to be delimiters by this StringTokenizer object is
192 changed to be the characters in the string delim. Then the next token in the
193 string after the current position is returned. The current position is advanced
194 beyond the recognized token. The new delimiter set remains the default after
198 delim - the new delimiters.
200 Returns: the next token, after switching to the new delimiter set.