String tokenizer in java

• Home • Java • Servlet • JSP • Struts2 • Hibernate • Spring • MyBatis • Java WS • C • C++ • C# • Python • PHP • Excel • VBA • Web • JavaScript • JQUERY • JSON • AJAX • CSS • HTML • HTML5 • Node.js • Angular 7 • SQL • MySQL • SQL Server • Misc • Eclipse • Phần mềm tiện ích • Cấu trúc DL> • Selenium Test Các constructor của lớp StringTokenizer trong java Constructor Mô tả StringTokenizer(String str) tạo ra một lớp StringTokenizer với chuỗi chỉ định. StringTokenizer(String str, String delim) tạo ra một lớp StringTokenizer dựa trên chuỗi chỉ định và dấu phân cách. StringTokenizer(String str, String delim, boolean returnValue) tạo ra một lớp StringTokenizer dựa trên chuỗi định, dấu phân cách và cờ hiệu. Nếu cờ hiệu là true, dấu phân cách được xem như là các phần tử token. Nếu là false, dấu phân cách không được tính là các phần tử token. Các phương thức của lớp StringTokenizer trong java Các phương thức non-private của lớp StringTokenizer được tóm tắt trong bảng sau: Phương thức Public Mô tả boolean hasMoreTokens() Trả về true nếu còn nhiều token trong chuỗi. String nextToken() Trả về token tiếp theo khi duyệt đối tượng StringTokenizer. String nextToken(String delim) Trả về token tiếp theo dựa trên dấu phân tách. boolean hasMoreElements() Giống như phương thức hasMoreTokens(). Object nextElement() Giống như nextToken() nhưng nó trả về một đối tượng. int countTokens() Trả về tổng số lượng của các token. package vn.viettuts.string; import java.util.StringTokenizer; public class...

StringTokenizer class in Java is used to break a string into tokens. A StringTokenizer object internally maintains a current position within the string to be tokenized. Some operations advance this current position past the characters processed. A token is returned by taking a substring of the string that was used to create the StringTokenizer object. It provides the first step in the parsing process often called lexer or scanner. The String Tokenizer class allows an application to break strings into tokens. It implements the Enumeration interface. This class is used for parsing data. To use String Tokenizer class we have to specify an input string and a string that contains delimiters. Delimiters are the characters that separate tokens. Each character in the delimiter string is considered a valid delimiter. Default delimiters are whitespaces, new line, space, and tab. Illustration: • StringTokenizer(String str): default delimiters like newline, space, tab, carriage return, and form feed. • StringTokenizer(String str, String delim): delim is a set of delimiters that are used to tokenize the given string. • StringTokenizer(String str, String delim, boolean flag): The first two parameters have the same meaning wherein The flagserves the following purpose. 3.1: If the flag is false, delimiter characters serve to separate tokens Example: Input : if string --> "hello geeks" and Delimiter is " ", then Output: tokens are "hello" and "geeks". 3.2: If the flag is true, delimiter ch...

StringTokenizer is a class in Java that allows you to break a string into smaller pieces, or tokens, based on a specified delimiter. Here is an example of how to use the StringTokenizer class: import java.util.StringTokenizer; public class Example In this example, we create a StringTokenizer object called tokenizer and pass it the string “The quick brown fox jumps over the lazy dog”. By default, StringTokenizer uses whitespace as the delimiter, so the string is broken up into tokens based on spaces. We use the countTokens() method to count the number of tokens in the string and store the result in the tokenCount variable. Finally, we print the number of tokens to the console. When we run this code, we should see output like the following: Number of tokens: 9 This demonstrates how to use the countTokens() method of StringTokenizer to count the number of tokens in a string. Categories

Building or modernizing a Java enterprise web app has always been a long process, historically. Not even remotely quick. That's the main goal of Jmix is to make the process quick without losing flexibility - with the open-source RAD platform enabling fast development of business applications. Critically, it has very minimal impact on your server's performance, with most of the profiling work done separately - so it needs no server changes, agents or separate services. Simply put, a single Java or Kotlin developer can now quickly implement an entire modular feature, from DB schema, data model, fine-grained access control, business logic, BPM, all the way to the UI. Jmix supports both developer experiences – visual tools and coding, and a host of super useful plugins as well: >> Try out Jmix Slow MySQL query performance is all too common. Of course it is. A good way to go is, naturally, a dedicated profiler that actually understands the ins and outs of MySQL. The Jet Profiler was built for MySQL only, so it can do things like real-time query performance, focus on most used tables or most frequent queries, quickly identify performance issues and basically help you optimize your queries. Critically, it has very minimal impact on your server's performance, with most of the profiling work done separately - so it needs no server changes, agents or separate services. Basically, you install the desktop application, connect to your MySQL server, hit the record button, and you'll hav...

I am using a tab (/t) as delimiter and I know there are some empty fields in my data e.g.: one->two->->three Where -> equals the tab. As you can see an empty field is still correctly surrounded by tabs. Data is collected using a loop : while ((strLine = br.readLine()) != null) Yet Java ignores this "empty string" and skips the field. Is there a way to circumvent this behaviour and force java to read in empty fields anyway? There is a StringTokenizer issue with a status Will not fix. The evaluation of this RFE states, I quote: With the addition of the java.util.regex package in 1.4.0, we have basically obsoleted the need for StringTokenizer. We won't remove the class for compatibility reasons. But regex gives you simply what you need. And then suggests using String#split(String) method. Thank you at all. Due to the first comment I was able to find a solution: Yes you are right, thank you for your reference: Scanner s = new Scanner(new File("data.txt")); while (s.hasNextLine()) As you can see in the Java Doc public StringTokenizer(String str, String delim, boolean returnDelims) with returnDelims true So it returns each Delimiter as a seperate string! Edit: DON'T use this way, as @npe already typed out, StringTokenizer shouldn't be used any more! See JavaDoc: StringTokenizer is a legacy class that is retained for compatibility reasons although its use is discouraged in new code. It is recommended that anyone seeking this functionality use the split method of String or the j...

I have a text file which contains data seperated by '|'. I need to get each field(seperated by '|') and process it. The text file can be shown as below : ABC|DEF||FGHT I am using string tokenizer(JDK 1.4) for getting each field value. Now the problem is, I should get an empty string after DEF.However, I am not getting the empty space between DEF & FGHT. My result should be - ABC,DEF,"",FGHT but I am getting ABC,DEF,FGHT From StringTokenizer documentation : StringTokenizer is a legacy class that is retained for compatibility reasons although its use is discouraged in new code. It is recommended that anyone seeking this functionality use the split method of String or the java.util.regex package instead. The following code should work : String s = "ABC|DEF||FGHT"; String[] r = s.split("\\|"); Use the returnDelims flag and check two subsequent occurrences of the delimiter: String str = "ABC|DEF||FGHT"; String delim = "|"; StringTokenizer tok = new StringTokenizer(str, delim, true); boolean expectDelim = false; while (tok.hasMoreTokens()) this prints ABC DEF null FGHT The API isn't pretty and therefore considered legacy (i.e. "almost obsolete"). Use it only with where pattern matching is too expensive (which should only be the case for extremely long strings) or where an API expects an Enumeration. In case you switch to String.split(String), make sure to quote the delimiter. Either manually ( "\\|") or automatically using string.split(Pattern.quote(delim)); StringTokenizer ign...

i'm doing tokenizing a text file in java. I want to read an input file, tokenize it and write a certain character that has been tokenized into an output file. This is what i've done so far: package org.apache.lucene.analysis; import java.io.BufferedReader; import java.io.File; import java.io.FileReader; import java.io.IOException; import java.io.InputStreamReader; import java.io.StreamTokenizer; class StringProcessing //end class When i run this code, this is what i get: Please enter a java file name: D://eclipse-java-helios-SR1-win32/LexractData.DAT Number of tokens = 129 java.io.FileReader@19821fException in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: 25 at java.lang.String.charAt(Unknown Source) at org.apache.lucene.analysis.StringProcessing.main(StringProcessing.java:40) The input file will look like this: -K1 Account --Op1 withdraw ---Param1 an ----Type Int ---Param2 amount ----Type Int --Op2 deposit ---Param1 an ----Type Int ---Param2 Amount ----Type Int --CA1 acNo ---Type Int -K2 CheckAccount --SC Account --CA1 credit_limit ---Type Int -K3 Customer --CA1 name ---Type String -K4 Transaction --CA1 date ---Type Date --CA2 time ---Type Time -K5 CheckBook -K6 Check -K7 BalanceAccount --SC Account I just want to read the string which are starts with -K1, -K2, -K3, and so on... can anyone help me? when i run this code, this is what i got java.io.FileReader@19821fException in thread "main" java.lang.StringIndexOutOfBoundsException: St...

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 returnDelims flag having the value true or false: • If the flag is false, delimiter characters serve to separate tokens. A token is a maximal sequence of consecutive characters that are not delimiters. • If the flag is true, delimiter characters are themselves considered to be tokens. A token is thus either one delimiter character, or a maximal sequence of consecutive characters that are not delimiters. A StringTokenizer object internally maintains a current position within the string to be tokenized. Some operations advance this current position past the characters processed. A token is returned by taking a substring of the string that was used to create the StringTokenizer object. The following is one example of the use of the tokenizer. The code: StringTokenizer st = new StringTokenizer("this is a test"); while (st.hasMoreTokens()) prints the following output: this is a test StringTokenizer is a legacy class that is retained for compatibility re...

StringTokenizer is a class in Java that allows you to break a string into smaller pieces, or tokens, based on a specified delimiter. Here is an example of how to use the StringTokenizer class: import java.util.StringTokenizer; public class Example In this example, we create a StringTokenizer object called tokenizer and pass it the string “The quick brown fox jumps over the lazy dog”. By default, StringTokenizer uses whitespace as the delimiter, so the string is broken up into tokens based on spaces. We use the countTokens() method to count the number of tokens in the string and store the result in the tokenCount variable. Finally, we print the number of tokens to the console. When we run this code, we should see output like the following: Number of tokens: 9 This demonstrates how to use the countTokens() method of StringTokenizer to count the number of tokens in a string. Categories

Building or modernizing a Java enterprise web app has always been a long process, historically. Not even remotely quick. That's the main goal of Jmix is to make the process quick without losing flexibility - with the open-source RAD platform enabling fast development of business applications. Critically, it has very minimal impact on your server's performance, with most of the profiling work done separately - so it needs no server changes, agents or separate services. Simply put, a single Java or Kotlin developer can now quickly implement an entire modular feature, from DB schema, data model, fine-grained access control, business logic, BPM, all the way to the UI. Jmix supports both developer experiences – visual tools and coding, and a host of super useful plugins as well: >> Try out Jmix Slow MySQL query performance is all too common. Of course it is. A good way to go is, naturally, a dedicated profiler that actually understands the ins and outs of MySQL. The Jet Profiler was built for MySQL only, so it can do things like real-time query performance, focus on most used tables or most frequent queries, quickly identify performance issues and basically help you optimize your queries. Critically, it has very minimal impact on your server's performance, with most of the profiling work done separately - so it needs no server changes, agents or separate services. Basically, you install the desktop application, connect to your MySQL server, hit the record button, and you'll hav...