Using String Tokenizer in constructors

Hi there,
I am supposed to create a constructor name called Abbreviation (String abbrName, String fullName).
and Im given a list of abbreviation and their full name as followed in a text file: eg:
US - United States
UK - United Kingdom
How do I initialize the objects using the Abbreviation class?
I have done some codings, please do take a look:
public Abbreviation(String abbrName, String fullName)
               this.abbrName = abbrName;
               StringTokenizer strToken = new StringTokenizer(fullName, "- ");
               //how do I count the number of abbreviation and stored them in a array ?
Thanks..

You need to create a new instance of your Abreviation class for each line you read from the file, so you can't read the file in the constructor. The constructor gets called for each instance of the class you create.
I wouldn't recommend StringTokenizer here, unless it's specified in your project. There are various ways you could try. I suggest you read up on String.split(), and regular expressions. (you might use the java.util.regexp.Pattern class).
Also read up on ArrayList.

Similar Messages

How to retrieve IndividualStrings from a txt file using String Tokenizer.

hello can any one help me to retrieve the individual strings from a txt file using string tokenizer or some thing like that.
the data in my txt file looks like this way.
Data1;
abc; cder; efu; frg;
abc1; cder2; efu3; frg4;
Data2
sdfabc; sdfcder; hvhefu; fgfrg;
uhfhabc; gffjcder; yugefu; hhfufrg;
Data3
val1; val2; val3; val4; val5; val6;
val1; val2; val3; val4; val5; val6;
val1; val2; val3; val4; val5; val6;
val1; val2; val3; val4; val5; val6;
i need to read the data as an individual strings and i need to pass those values to diffarent labels,the dat in Data3 i have to read those values and add to an table datamodel as 6 columns and rows depends on the data.
i try to retrieve data using buffered reader and inputstream reader,but only the way i am retrieving data as an big string of entire line ,i tried with stringtokenizer but some how i was failed to retrive the data in a way i want,any help would be appreciated.
Regards,

Hmmm... looks like the file format isn't even very consistent... why the semicolon after Data1 but not after Data2 or Data3??
Your algorithm is reading character-by-character, and most of the time it's easier to let a StringTokenizer or StreamTokenizer do the work of lexical analysis and let you focus on the parsing.
I am also going to assume your format is very rigid. E.g. section Data1 will ALWAYS come before section Data2, which will come before section Data3, etc... and you might even make the assumption there can never be a Data4, 5, 6, etc... (this is why its nice to have some exact specification, like a grammar, so you know exactly what is and is not allowed.) I will also assume that the section names will always be the same, namely "DataX" where X is a decimal digit.
I tend to like to use StreamTokenizer for this sort of thing, but the additional power and flexibility it gives comes at the price of a steeper learning curve (and it's a little buggy too). So I will ignore this class and focus on StringTokenizer.
I would suggest something like this general framework:
//make a BufferedReader up here...
do
String line = myBufferedReader.readLine();
if (line!=null && line.trim().length()>0)
line = line.trim();
//do some processing on the line
while (line!=null);So what processing to do inside the if statement?
Well, you can recognize the DataX lines easily enough - just do something like a line.startsWith("Data") and check that the last char is a digit... you can even ignore the digit if you know the sections come in a certain order (simplifying assumptions can simplify the code).
Once you figure out which section you're in, you can parse the succeeding lines appropriately. You might instantiate a StringTokenizer, i.e. StringTokenizer strtok = new StringTokenizer(line, ";, "); and then read out the tokens into some Collection, based on the section #. E.g.
strtok = new StringTokenizer(line, ";, ");
if (sectionNo==0)
//read the tokens into the Labels1 collection
else if (sectionNo==1)
//read the tokens into the Labels2 collection
else //sectionNo must be 2
//create a new line in your table model and populate it with the token values...
}I don't think the delimiters are necessary if you are using end-of-line's as delimiters (which is implicit in the fact that you are reading the text out line-by-line). So the original file format you listed looks fine (except you might want to get rid of that rogue semicolon).
Good luck.

Using String Tokenizer on connection string

I have a database connnection string like so:
jdbc:oracle:thin:@<url>:<port number>:<database name>
I'm planning to use String Tokenizer to extract the database name. Is this possible. Where can I start?

I have a database connnection string like so:
jdbc:oracle:thin:@<url>:<port number>:<database
name>
I'm planning to use String Tokenizer to extract the
database name. Is this possible. Where can I start?You can tokenize on ":". Then put eack token on a list. Yourdatabase name will be last element of the list. Take a look at on StrnngTokenizer API.

How to read a file using string tokenizer ?

He everybody
I am bit new to java !
i have a text file call Student.txt which contain a StudentName + thier marks
like this way
Shane 60
Will 73
Lorenzo 12
What i need to do is i need to use stringtokenizer class to populate an array of Student name and marks and display the array ?
i need to store Studentname as a String and Marks as integer ?
how do i do this task ?
help me to solve my problem !
regards
suis

Hallo,
I am giving a sample code and just look at that one, and think about your requirement.
File file = new File(" employee.txt");
FileReader freader = new FileReader(file);
BufferReader breader = new BufferReader(freader);
String inLine = null;
while ((inLine = inputStream.readLine()) != null) {
st = new StringTokenizer(inLine, DELIM);
String studentname[] =String[10];
for(int i=0; i<studentname.length;i++)
studentname[i] = st.nextToken();
int marks[] = new int[10];
for ( int i=0;i<marks.length;i++)
marks[i] = st.nextToken();
If you want print out these value, you can...
Best Regards
Maruthi

Trying to use string tokenizer but not working as expected

Hello friends,
In the following code, I am trying to acheive an output like this:
Manju Nambiar
Mini Nambiar
-variable mc stands for the maximum number characters allowed in a line.
-variable wb stands for wordbreak allowed i.e if set to false, a word should be printed as it is without splitting even if the maxchar limit is crossed, but then the next word should come on the next line.
String input = "Manju Nambiar Mini Nambiar";
String token;
String wb = "f";
String newlineop = System.getProperty("line.separator");
int mc = 10;
if(wb.equalsIgnoreCase("f"))
StringTokenizer splitip = new StringTokenizer(input," ");
while(splitip.hasMoreTokens())
token = splitip.nextToken();
System.out.println("length is:"+newlineop.length());
if((newlineop.length())<mc)
newlineop = newlineop.concat(token+" ");
else
newlineop = newlineop.concat(newline+token);
System.out.println(newlineop);
The output I am getting is:
Manju Nambiar
Mini
Nambiar
I know it is because of the length of the newlineop variable that I am checking in the loop - but I am not able to see how to circumvent this??? :-(
Please Help,
Thanks,
Manju

        String input = "Manju Nambiar Mini Nambiar";
        String token;
        boolean wb = false; // as Nasch pointed out, use boolean here
        String newlineop = System.getProperty("line.separator");
        int tokenLength = 0; // variable to check length of line
        int mc = 10;
        if (!wb)
            StringTokenizer splitip = new StringTokenizer(input, " ");
            while (splitip.hasMoreTokens())
                token = splitip.nextToken();
                if (tokenLength < mc)
                    tokenLength += token.length();
                    newlineop = newlineop.concat(token + " ");
                else
                    tokenLength = token.length(); //new line, reset length
                    newlineop = newlineop.concat("\n" + token + " ");
        System.out.println(newlineop);
    ram.

Compare file using string tokenizer

hi there..
i have a file creation file_20061208.txt
and how am i suppose to tokenize it so i can juz retrieve 20061208??

ok this is my code so how do i go abt tokenising it?
files = directory.listFiles();
               File lastModifiedFile = null;
               for (int i = 0; i < files.length; i++)
                    if(files.isFile())
                         if(lastModifiedFile == null)
                         lastModifiedFile = files[i];
                         if(lastModifiedFile != null)
                              if(lastModifiedFile.lastModified() < files[i].lastModified())
                                   lastModifiedFile = files[i];

Parsing and String tokenizer

I am trying to use String Tokenizer to extract fields from a file then do a calculation on some of the fields.
My problem is when I try to parse the strings that need the calculations I get error codes as shown at the end of post. I don't see why the parsing shouldn't work.( error codes are class expected and incompatable types)
// ParsingTextFile.java: Process text file using StringTokenizer
import java.io.*;
import java.util.StringTokenizer;
public class ParsingTextFile1 {
/** Main method */
public static void main(String[] args) {
   // Declare buffered file reader and writer streams
   BufferedReader brs = null;
   BufferedWriter bws = null;
   //declare tokenizer
   StringTokenizer tokenizer;
   // Declare a print stream
   PrintWriter out = null;
    // Five input file fields:total string, student name, midterm1,
    // midterm2, and final exam score
    String line=null;
    String sname = null;
   String mid1= null;
    String mid2 = null;
    String finalSc = null;
/ double midterm1 = 0;
    double midterm2 = 0;
    double finalScore = 0;
    // Computed total score
    double total = 0;
    try {
      // Create file input and output streams
      brs = new BufferedReader(new FileReader("in.dat"));
      bws = new BufferedWriter(new FileWriter("out.dat"));
     while((line= brs.readLine())!=null){
     tokenizer =new StringTokenizer(line);
      sname = tokenizer.nextToken();
      mid1 = tokenizer.nextToken();
      mid2 = tokenizer.nextToken();
      finalSc= tokenizer.nextToken();
      midterm1 = double.parseDouble(mid1)//this code not working
      midterm2 = double.parseDouble(mid2);)//this code not working
      finalScore = double.parseDouble(finalScore);//this code not working
      out = new PrintWriter(bws);
      total = midterm1*0.3 + midterm2*0.3 + finalScore*0.4;
      out.println(sname + " " + total);
    catch (FileNotFoundException ex) {
      System.out.println("File not found: in.dat");
    catch (IOException ex) {
      System.out.println(ex.getMessage());
    finally {
      try {
        if (brs != null) brs.close();
        if (bws != null) bws.close();
      catch (IOException ex) {
        System.out.println(ex);
}[\code]
errorsC:\j2sdk1.4.1_06\bin\ParsingTextFile1.java:43: class expected
    midterm1 = double.parseDouble(mid1);
                      ^
C:\j2sdk1.4.1_06\bin\ParsingTextFile1.java:44: class expected
    midterm2 = double.parseDouble(mid2);
                      ^
C:\j2sdk1.4.1_06\bin\ParsingTextFile1.java:45: class expected
    finalScore = double.parseDouble(finalScore);
                        ^
C:\j2sdk1.4.1_06\bin\ParsingTextFile1.java:43: incompatible types
found   : java.lang.Class
required: double
    midterm1 = double.parseDouble(mid1);
                     ^
C:\j2sdk1.4.1_06\bin\ParsingTextFile1.java:44: incompatible types
found   : java.lang.Class
required: double
    midterm2 = double.parseDouble(mid2);
                     ^
C:\j2sdk1.4.1_06\bin\ParsingTextFile1.java:45: incompatible types
found   : java.lang.Class
required: double
    finalScore = double.parseDouble(finalScore);
                       ^
6 errors
Process completed.

while(line.hasMoreTokens())
sname = tokenizer.nextToken();
   mid1 = tokenizer.nextToken();
mid2 = tokenizer.nextToken();
   finalSc= tokenizer.nextToken();
    midterm1 = double.parseDouble(mid1)//this code not working
     midterm2 = double.parseDouble(mid2);)//this code not working
   finalScore = double.parseDouble(finalScore);//this code not working
}if it doesn't work then you need to add delimiter Or the token that you are trying to convert into is not valid.

Regarding string tokenizer

Hello all,
Can anybody help me to get the file name which is specified in the path like C:/programs/folder/example.txt" or "C:/programs/folder/test.txt" or "C:/programs/example/verify.txt" . The path name will change dynamically in my program.
What I want to do is to get the filename from the path using string tokenizer.
Thanks in advance.

I think I do. Why don't you try that code snippet out
and see that when you invoke File.getName it returns
you the file name with the path part stripped out.
Isn't that what you said you wanted?Even if that ability did not exist (but clearly a programmer should always use it if it is available) then it would be simply to substring the full path starting at last index of the current platform's file separator, and ending at the end of the path string.

Help!! i dont know how to make use of token from string tokenizer :(

Hi,
I would like to ask how to manipulate the token that are taken from string tokenizer. For example :
input = a b 1 f 986
supposed output:
a
b
1
f
986
How to make the output look like this?
Output = (a,b,f),(1,986)
Below is the source code of Algebra.java
import java.io.*;
import java.util.*;
* Read and print, using BufferedReader from System.in, onto System.out
public class Algebra {
public static void main(String[] av) {
try {
BufferedReader is = new BufferedReader(new InputStreamReader(System.in));
String inputLine;
System.out.print("Input =");
while ((inputLine = is.readLine()) != null) {
System.out.println("Output="+inputLine);
StringTokenizer st =
new StringTokenizer(inputLine, ", |");
while (st.hasMoreElements())
System.out.println("Token: " + st.nextElement());
break;
is.close();
} catch (IOException e) {
System.out.println("IOException: " + e);
Thank You

You can modify this to serve your goal.
BufferedReader is=null;
try {
is = new BufferedReader(new InputStreamReader(new FileInputStream("Data.txt")));
StreamTokenizer st = new StreamTokenizer(is);
int n=0,k=0,q=0;
String[] s=new String[20];
String[] s0=new String[10];
while(st.nextToken() != StreamTokenizer.TT_EOF) {
        switch(st.ttype) {
          case StreamTokenizer.TT_EOL:
            s[k] = new String("EOL");k++;
            break;
          case StreamTokenizer.TT_NUMBER:
            s0[q] = Double.toString(st.nval);q++;
            break;
          case StreamTokenizer.TT_WORD:
            s[k] = st.sval; // Already a String
             k++;
            break;
          default: // single character in ttype
            s[k] = String.valueOf((char)st.ttype); k++;
        } //end of while
   //   Some output processing here
}catch(IOException ioe){
   ioe.printStackTrace();
}catch(ArrayIndexOutOfBoundsException bx){
   System.err.println(bx);
}finally{
       try{      if(is !=null)     is.close();}catch(IOException ioe){;}
}

Do i need to use a string tokenizer here?

I am doing a program that reads a text file and write it to another new file. Before, writing out the required text lines to a new file, the program should be able to extract certain words from the text file that had been read and the user can able to put some semicolons after certain word character. Do i need to use substring or string tokenizer in order to extarct the words and add some chracters to it??? i dunt understand how to do it. Can anyone help me out here?..thanks.

sure, uncle. here i give u the input and the sample out put it should be. Another thing, is that my data length for certain characters are not same , so how would i determine the appropriate length to put the semicolon....the example input :
470615-03-5039058004TA SECURITIES HOLDINGS BERHAD 000891226AB KARIM BIN MAT HUSSIN LOT 2761 DEPAN ESSO TG MAS JALAN PENGKALAN CHEPA15400 KOTA BHARU 15400DMYSMYSBI 09-7735699 8516 000000080000000100 812974
this is stored in a file n the program will read it
then, it shud put semicolon at certain parts n write it out back. i try to use the insert code but it only works for string buffer as im using buffer reader here.
the output should be.
470615-03-5039 ; 004; SECURITIES HOLDINGS BERHAD ;00891226AB ; KARIM BIN MAT HUSSIN; LOT 2761 DEPAN ESSO TG MAS ; JALAN PENGKALAN CHEPA;15400 KOTA BHARU ; 15400;D;MY;SMYSBI ;09-7735699 8516 ;000000080000000100; 2812974 ...the semicolons shud be put here...but there are different numbers for this part ( 470615-03-5039 )....for example...(978T)...so, how am i goin to determine the correct part to put the semicolon????..plz help me...thanks

Problems with string tokenizer

okay heres my problem, i have a textarea displaying a program listing and i have to extract variables i.e public int something;
i have tried many different approaches but still the output is not what i was looking for. Can someone have a look at my code and check for mistakes that i cant find
public void createDataDictionary() {
          if(fullText.equals("")) return;//do nothing if no text exists
          String checkText = fileContents.getText();//store text area contents into string
          String dataType = "";
          String variable = "";
          String accessModifier = "";
          StringTokenizer str = new StringTokenizer(checkText," \n", true);
          fileCheckBox.setText("");//clear file check box
          while(str.hasMoreTokens()) {//loop while there are more tokens to tokenize
               try{
                    checkText = str.nextToken();
                    //check for comments
                    if((checkText.startsWith("//")) || (checkText.equals("//")) ||
                       (checkText.startsWith("/**")) || (checkText.equals("/**")) ||
                       (checkText.startsWith("*")) || (checkText.equals("*"))) {
                         isComment = true;
                    if((checkText.equals("\n"))) isComment = false;
                    if(!isComment)
                         //check for access modifiers
                         if((checkText.equals("public")) || (checkText.equals("private")) ||
                            (checkText.equals("protected"))) {
                                      accessModifier = checkText;
                                 }else {
                                      accessModifier = "";
                         //check for data types
                         if((checkText.equals("boolean")) || (checkText.equals("char")) ||
                                 (checkText.startsWith("String")) || (checkText.equals("int"))) {
                                   dataType = checkText;
                                   variable = str.nextToken();//get variable expression
                                   System.out.println(accessModifier + " " + dataType + " " + variable);
               }catch(NoSuchElementException nsee) {//not enough tokens to complete operation
                    JOptionPane.showMessageDialog(null, "End of file");
                    return;//break from method
     }here is sample text
private String seven = "help";
char five[];
// String here
//int found
public boolean okay
and here is the output
String
char
String
boolean
//note the space before each output
hope someone can help
thanx in advance

1. Why do you check to see if the token starts with
//, /*, etc, etc. Later you check if the token
equals private, public, protected. It couldn't
equal if it started with a comment.if the token starts with a comment i dont want to read the rest of the line, so i set the isComment flag to true
2. I strongly suggest that you do it line by line.
Perhaps a string tokenizer that only tokenizes by
lines, then within that loop, another that tokenizes
by whitespace. i take it you mean putting the text into a bufferedreader and then using readLine()?? Bit new to string tokenization as you can possibly see
i managed to get the small test text to work more or less as i wanted but when ever i load a large code listing, the results are erratic to say the least
heres a section of this code
private int textNum = 0;/**Integer used to hold the text position within any given line*/
     private int lineNum = 0;/**Integer used to hold the line number within any given file*/
     static boolean application = false;/**Used to track if applet is ran from a browser or JAR file*/
     static boolean fileOpened = false;/**Used to track if file has already been opened*/
     static boolean isComment = false;
     private char lCurve = '(';
     private char rCurve = ')';
     private char lCurly = '{';
     private char rCurly = '}';
     private char lSquare = '[';
     private char rSquare = ']';
     String fullText = "";and heres the output
public int textNum //should be private!!!!
int lineNum //missing private
boolean application //missing static
boolean fileOpened //missing static
boolean isComment //missing static
//all below missing private
char lCurve
char rCurve
char lCurly
char rCurly
char lSquare
char rSquare
String fullText //not there at all

How can i delete a UserName from a text file using Strings or io.

hi i m trainee
i have been assigned to make java program which deletes a UserName and
his Passwor from a Text File
i m unable to do it using the code below
plz help
do reply
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java .applet.*;
import java.io.*;
class Del extends JFrame implements ActionListener
     String s2;
     JTextField CWDMUserDText = new JTextField();
     JButton CWDMSecDelButton = new JButton("DELETE");
     JLabel CWDMUserLabel = new JLabel("USER NAME");
     JPasswordField CWDMPassDText = new JPasswordField();
     JLabel CWDMPassLabel = new JLabel("PASSWORD");
     //String user,pass;
     /* CONSTRUCTOR*/
          Del()
               Container contentPane=getContentPane();
               contentPane.setLayout(null);
              setLocation(400,200);
               contentPane.add(CWDMUserDText);
               contentPane.add(CWDMSecDelButton);
               contentPane.add(CWDMUserLabel);
               contentPane.add(CWDMPassDText);
               contentPane.add(CWDMPassLabel);
              CWDMUserLabel.setBounds(20,70,100,25);
              CWDMPassLabel.setBounds(20,100,100,25);
               CWDMUserDText.setBounds(150,70,100,25);
               CWDMPassDText.setBounds(150,100,100,25);
               CWDMSecDelButton.setBounds(80,135,100,25);
               CWDMUserDText.addActionListener(this);
               CWDMPassDText.addActionListener(this);
               CWDMSecDelButton.addActionListener(this);
               contentPane.setBackground(Color.CYAN);
               setVisible(true);
               setDefaultCloseOperation(EXIT_ON_CLOSE);
     public void actionPerformed(ActionEvent ae)
              if(ae.getSource()==CWDMSecDelButton)
     //             user = CWDMUserDText.getText();
     //          pass = CWDMPassDText.getText();
     //          showarr();
               s2 = CWDMUserDText.getText();
               CWDMUserDText.setText("");
               CWDMPassDText.setText("");
               DelUser(s2);
          public static void main(String args[])
               Del myframe1= new Del();
               myframe1.setSize(300,200);
               myframe1.setVisible(true);
          public void DelUser(String s)
               //int a;
               try
                    FileReader fr = new FileReader("file.txt");
                    BufferedReader br = new BufferedReader(fr);
                   String s1;
                   int a;
                   int len = s.length();
                   System.out.println(len);
                   //s2 = CWDMUserDText.getText();
                    while ((s1=br.readLine()) !=null)
                         if((a=s1.indexOf(s))>0 && (a=s1.indexOf(s))!=0)
                              System.out.println(a);
                    fr.close();
               catch(FileNotFoundException e)
                    System.out.println("exception occured");
               catch(IOException e)
                    System.out.println("io");
     }

Some tips:
1) If you are adding or deleting stuff from a text file you need to write a new, modified file and then, optionally, do something like:
rename the old file to whatever.bak or the like.
rename the new file to the old.
2) Don't depend on System.out so much on a GUI application. For example if you get an exception use javax.swing.JOptionPane to display an alert (and show the message from the exception). You can write the stack trace to System.out if you want.
3) Don't muck about with calculating bounds for screen objects, let a layout manager sort it out. I like BoxLayoutManager for most things like this.
4) For bonus points do your IO in a separate Thread. Generally you don't want anything happening in an actionPerformed method which significantly delays it's return. The method should launch a new Thread to do the job, and disable the button until the Thread finishes.

Error in XSLT mapping while using string functions

Hi All,
While using tokenize() and substring-before() functions in XSLT mapping,we are getting an error.The error message is Unexpected symbol "" So while using string functions in XSLT mapping do we have to use any header functions.
Please through light on syntax etc.,of string functions in XSLT.
Thanx in advance,
Lokesh Dhulipudi
Edited by: LOKESH DHULIPUDI on Dec 27, 2007 7:32 AM

Hi,
Hope you have gone thru this help:
http://w3schools.com/xsl/default.asp
Rgds, Moorthy

Need help for string tokenizer!

I need help in writing out the string tokenizer.. i've got all of the functions written except for the nexttokken function which i am stuck in. Can anyone help me out in writing the function?

An example of splitting string by comma
String str"A,B,C";
StringTokenizer st = new StringTokenizer(str,",");
while (st.hasMoreTokens()) {
System.out.println(st.nextToken());
This is just an example of usage; i would prefer to use split() function instead

String Tokenizer Helps

I need a little help
i am having trouble removing ALL the white space from my string using a tokenizer
here is my code so far:
    String str = "klj f a sklj fdaskldf"
    String deLimiters = " ";
    StringTokenizer tokens = new StringTokenizer(str, deLimiters);
    while(tokens.hasMoreTokens())
}how would i remove all the white space...and then display the string w/out white space???

DrLaszloJamf wrote:
<quote>
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.
</quote>
It feels quite comfortable to use StringTokenizer over split. And in schools, and the way that I was tough at my time
instructors mainly used StringTokenizer.

Using String Tokenizer in constructors

Similar Messages

Maybe you are looking for