StringTokenizer is a string-separated parsing type, which belongs to: java.util package.
The substring method in Java can decompose a string and return a substring of the original string.
If you want to decompose a string into individual words or tokens, StringTokenizer can help you.
StringTokenizer has two commonly used methods:
Note: All methods are public
1.hasMoreTokens()
The hasMoreElements()usage of this method is the same as that of the method , except that StringTokenizer implements the method to implement the Enumeration interface. From the declaration of StringTokenizer, you can see: class StringTokenizer implements Enumeration.
2.nextToken()
The nextElement()usage of this method is the same as that of the method, and returns the next token of this StringTokenizer.
Other methods
int countTokens(): Returns how many tokens are matched in total
String s = new String("www.baidu.com");
// 分词器构造函数三个参数，第一个是待分隔的字符串，第二个为分隔字符串，以字符为分隔单位（比如the，可能匹配到e，就会分隔），
//第三个参数说明是否要把分割字符串作为标记返回
StringTokenizer st = new StringTokenizer(s, ".", true);
System.out.println("Token Total:" + st.countTokens());
while (st.hasMoreElements()) {
System.out.println(st.nextToken());
}
result:
Three construction methods of StringTokenizer:
1.StringTokenizer(String str)
By default, "\t\n\r\f" (preceded by a space, quotation marks are not) is used as the separator.
public static void main(String[] args) {
StringTokenizer st = new StringTokenizer("www baidu com");
while(st.hasMoreElements()){
System.out.println("Token:" + st.nextToken());
}
}
Output:
Token:www
Token:baidu
Token:com
2.StringTokenizer（String str，String delim）
Construct a StringTokenizer object for parsing str and provide a specified separator.
3.StringTokenizer（String str，String delim，boolean returnDelims）
Construct a StringTokenizer object for parsing str and provide a specified separator. At the same time, specify whether to return the separator.
public static void main(String[] args) {
StringTokenizer st = new StringTokenizer("www.baidu.com", ".", true);
while(st.hasMoreElements()){
System.out.println("Token:" + st.nextToken());
}
}
Output:
Token:www
Token:.
Token:baidu
Token:.
Token:com