String[] args fights String... args

Hi,
I thought this error message was a joke at first, but it's for real:
Arrayz.java:15: cannot declare both in(java.lang.String,java.lang.String[]) and in(java.lang.String,java.lang.String...) in krc.utilz.ArrayzPlease, would anyone care to offer an opinion as to WHY the compiler does not differentiate between String[] args and String... args. Obviously String... args is implemented internally as String[] args, but that really shouldn't effect the interface... and if they are internally equivalent then wny not allow a syntax that effectively declares both in one... It's just that I would have thought it was possible (and desirable) for the compiler & JVM to do the required parameter matching for both definitions... in my mind the calling parameter list of (String, String, String) is distinct from (String, String[]) ... Or does java (like C/C++) internally not differentiate between the types reference-to-String and reference-to-array-of-Strings and reference-to-array-of-array-of-Strings ????
I'm just a tad miffed about this... I mean, it's easy to work around in at least a dozen simple ways, it's just that the compiler didn't do what I expected it to do, so it should just pull it's socks up, and, well, you know, Work!
Here's the code... complete with compiler error.
package krc.utilz.stringz;
public class Arrayz
    * returns true if the given value is in the args list, else false.
    * @param value - the value to seek
    * @param args... - variable number of String arguments to look in
public static boolean in(String value, String... args) {
    for(String a : args) if(value.equals(a)) return true;
    return false;
//Arrayz.java:15: cannot declare both in(java.lang.String,java.lang.String[]) and in(java.lang.String,java.lang.String...) in krc.utilz.Arrayz
public static boolean in(String value, String[] array) {
    for(String s : array) if(value.equals(s)) return true;
    return false;
}Thanx all. Keith.

I didn't know that. Cool!
package forums;
class VarArgsTester
public static String join(String FS, String... args) {
    if (args==null) return null;
    if (args.length==0) return "";
    StringBuffer sb = new StringBuffer(args[0]);
    for (int i=1; i<args.length; i++) {
      sb.append(FS+args);
return sb.toString();
public static void main(String[] args) {
System.out.println(join(" ", "Your", "momma", "wears", "army", "boots"));
String[] words = {"But", "she", "looks", "very", "nice", "in", "them"};
System.out.println(join(" ", words));
I was expecting a compiler error from the line[
pre]System.out.println(join(" ", words));
Thanks ~Puce.

Similar Messages

Req help in conversion of string to array of args

Hi,
i need help in converting a string into array of args just like command line args
i have a string s1 = 12 13 56 etc
now i want to copy that into an array a[]
a[0] = 12
a[1] = 13 etc
Thanks for help

U can use String tokenizer.Why prefer that over split?Yah Bobby u can use split too..
J2SE 1.4 added the split() method to simplify the task of breaking a string into substrings, or tokens.
Thanks BigDaddy.. I realized after you told.
try this too..
String str = "Your string";
String[] arr = str.split (" ");
for (int i=0; i < arr.length; i++)
System.out.println (arr);

Covert String Array to String

Hey,
I have this code that take a string
EX:
Straw? No, too stupid a fad, I put soot on warts
and takes out the "?" and "," and places a space in their spot, then tokenizes the string so now all the spaces are gone (right?) then places the tokenized string into and array. Now I want that array into a string.
Pretty much what I want to go from is
this:
Straw? No, too stupid a fad, I put soot on warts
to:
StrawNotoostupidafadIputsootonwarts
here is my code
import java.util.*;
public class TrivialApplication {
     public static void main(String args[])
          System.out.println( "Hello World!\n" );
          String hello = "Straw? No, too stupid a fad, I put soot on warts";
          hello = hello.replace('?',' ');
          hello = hello.replace(',',' ');
          StringTokenizer tokenizer = new StringTokenizer(hello);
          String[] array = new String[hello.length()];
          System.out.println(tokenizer.countTokens());
          System.out.println(hello.length());
          int count = tokenizer.countTokens();
          int x = 0;
          while(tokenizer.hasMoreTokens())
               array[x] = tokenizer.nextToken();
               x++;
}

Sweet thanks man here is the finished code. I took out the array because it was now not needed.
import java.util.*;
public class TrivialApplication {
     public static void main(String args[])
          System.out.println( "Hello World!\n" );
          String hello = "Straw? No, too stupid a fad, I put soot on warts";
          System.out.println(hello + "\n");
          hello = hello.replace('?',' ');
          hello = hello.replace(',',' ');
          StringTokenizer tokenizer = new StringTokenizer(hello);
          StringBuffer buffer = new StringBuffer();
          int count = tokenizer.countTokens();
          while(tokenizer.hasMoreTokens())
               buffer = buffer.append(tokenizer.nextToken());
          hello = buffer.toString();
          System.out.println("New String with changes \n");
          System.out.println(hello);
[\code]

Converting numerous strings to one string - any ideas how to do this?

Hi,
I've written a test main class where the user inputs, via the keyboard, one integer value and four strings. I've already converted the one integer to a string value, but I now need to convert all of the strings to one string
Does anybody know how to achieve this?
Many thanks!!

Thanks for the reply.
How do I change the saveTo method so it will add commas to the String filmDetails in the constructor within the class Title?
I don't understand what you mean when you say that I write to one file and read back from another. In my main class I'm only reading and writing to one file, as follows,
import simplejava.*;
import videos.*;
import java.io.*;
public class AddTitle {
    public static void main(String[] args) {
        String film, actor1, actor2, director, title;
        int codeNum;
        SimpleReader keyboard = new SimpleReader();
        SimpleWriter screen = new SimpleWriter();
        SimpleReader inFile = new SimpleReader("title_test.txt");
        //title = inFile.readLine();
        //String[] myStrings = title.split(",");
        TitleList titles = new TitleList(inFile);
        codeNum = keyboard.readInt("Title Code for the Film");
        int intValue = codeNum;
        String stringValue = Integer.toString(intValue);
        film = keyboard.readLine("Film Title?");
        actor1 = keyboard.readLine("Lead Actor?");
        actor2 = keyboard.readLine("Supporting Actor?");
        director = keyboard.readLine("Director?");
        String videoTitles = film+actor1+actor2+director;
        titles.add(new Title(codeNum, videoTitles));
        screen.println(titles);
        SimpleWriter outFile = new SimpleWriter("title_test.txt");
        titles.saveTo(outFile);
        outFile.close();
}In the main class I thought I was closing the file with the code,
outFile.close();Any ideas how to solve these problems?

Null String and Empty String problem

Hello everyone,
since i am totally new in JSP, i am getting problem in handling strings.
Suppose i have a variable users = ""; then
I want to ask when to use:
if (users.equals(""))
and
if(users == "")
in my code, variable users has value "regional" for regional users.
and i am checking this code as:
if (users.equals{"regional")) {
out.print ("I am inside code");
at that time, the code is throwing error (run time error)
and when i changed the code as:
if (users == "regional") {
out.print ("I am inside code");
this time, the code is not generating error but the part message "I am inside code " is not displaying. The code do not inserts inside the if condition
I hope u understand my problem. Can anybody help me out with this.

This has basically nothing to do with JSP, but with basic Java knowledge.
When using the '==' operator to compare Objects (yes, String is actually a subclass of Object), then it will look if they are of the same reference. Using the '==' operator to compare primitive datatypes (int, boolean, char, etc) will look if they have the same value.
That is why the Object class has the equals() method to give the ability compare with another objects. And you can only invoke it when the Object is actually instantiated. So if it is not null.
if (string != null && string.equals("somevalue")) {
// or
if ("somevalue".equals(string)) {
}should work.
Edit rym82: this will not throw a NPE, but an ordinary compilation error ;)
Message was edited by:
BalusC

What is difference between Null String and Empty String ?

Hi
Just i have little confusion that the difference bet'n NULL String and Empty String ..
Please clear my doubte.
Thankx

For the same reason I think it's okay to say "null
String" and "empty String "as long as you know they
really mean "null String reference" and "empty String
object" respectively. Crap. It's only okay to say that as long as *the one you're talking to" knows what it really means. Whether you know it or not is absolutely irrelevant. And there is hardly any ambiguity about the effects that a statement like "assign an object to a reference" brings. "Null String" differs in that way.

Difference between String and final String

Hi friends,
This is Ramana. Can u suggest me in this Question
What is the difference between String and final String? Means
String str="hai";
final String str="hai";
Regards,
Ramana.

*******REPEAT POST***********
We already answered your question why post in a different section?
http://forum.java.sun.com/thread.jspa?threadID=5201549

Replace String in a String

How can I replace a String in a String ,for example :
in the String "Hello World" replace Hello with Bye" ?
Is there a class or code I can find for that purpose?

use an utility method like this :
I did not found an existing method doing this in java.lang.String or StringBufer
public static String replaceFirstSubstring(
String stringToSubstitute, String searchString, String replaceString) {
if (stringToSubstitute == null) {
return null;
int prefixEndIndex = stringToSubstitute.indexOf(searchString);
if (prefixEndIndex == -1) {
return stringToSubstitute;
int suffixStartIndex = prefixEndIndex + searchString.length();
StringBuffer newString = new StringBuffer(stringToSubstitute.substring(0, prefixEndIndex));
newString.append(replaceString).append(stringToSubstitute.substring(suffixStartIndex));
return newString.toString();
put it in a while if you need to replace more than 1 time

Creating String frm new String(charBuffer.array()) Vs charBuffer.toString()

Whats the difference in creating String from CharBuffer by using array and by using toString() ?
When ever i have some UTF-8 chars in my file (""someFile"), String created from new String( charBuffer.array()) appends some extra null/junk charaters at the very end of the file.
How ever when i try charBuffer.toString() its working fine.
For simple ASCII i.e ISO-*** charset both methods are working fine.
Please see below code for reproducing. Here "someFile" is any text file with some UTF-8 characters.
public char[] getCharArray()
throws IOException
Charset charset = Charset.forName("UTF-8");
CharsetDecoder decoder = charset.newDecoder();
FileInputStream fis = new FileInputStream("someFile");
FileChannel channel = fis.getChannel();
int size = (int) channel.size();
MappedByteBuffer mbb = channel.map(FileChannel.MapMode.READ_ONLY, 0 , size);
CharBuffer cb = decoder.decode(mbb);
channel.close();
fis.close();
return cb.array();
public String getAsString()
throws IOException
Charset charset = Charset.forName("UTF-8");
CharsetDecoder decoder = charset.newDecoder();
FileInputStream fis = new FileInputStream("someFile");
FileChannel channel = fis.getChannel();
int size = (int) channel.size();
MappedByteBuffer mbb = channel.map(FileChannel.MapMode.READ_ONLY, 0 , size);
CharBuffer cb = decoder.decode(mbb);
channel.close();
fis.close();
return cb.toString();
String fromToString = getAsString();
String fromCharArray = new String(getCharArray());

Whats the difference in creating String from CharBuffer by using array and by using toString() ?array() returns the entire backing array regardless of offset and position. toString() takes those into account.
When ever i have some UTF-8 chars in my file (""someFile"), String created from new String( charBuffer.array()) appends some extra null/junk charaters at the very end of the file.More probably you haven't filled the array.
How ever when i try charBuffer.toString() its working fine.So there you go.

Replacing a special character in a string with another string

Hi
I need to replace a special character in a string with another string.
Say there is a string - "abc's def's are alphabets"
and i need to replace all the ' (apostrophe) with &apos& ..which should look like as below
"abc&apos&s def&apos&s are alphabets" .
Kindly let me know how this requirement can be met.
Regards
Sukumari

REPLACE
Syntax Forms
Pattern-based replacement
1. REPLACE [{FIRST OCCURRENCE}|{ALL OCCURRENCES} OF]
pattern
          IN [section_of] dobj WITH new
          [IN {BYTE|CHARACTER} MODE]
          [{RESPECTING|IGNORING} CASE]
          [REPLACEMENT COUNT rcnt]
          { {[REPLACEMENT OFFSET roff]
             [REPLACEMENT LENGTH rlen]}
          | [RESULTS result_tab|result_wa] }.
Position-based replacement
2. REPLACE SECTION [OFFSET off] [LENGTH len] OF dobj WITH new
                  [IN {BYTE|CHARACTER} MODE].
Effect
This statement replaces characters or bytes of the variable dobj by characters or bytes of the data object new. Here, position-based and pattern-based replacement are possible.
When the replacement is executed, an interim result without a length limit is implicitly generated and the interim result is transferred to the data object dobj. If the length of the interim result is longer than the length of dobj, the data is cut off on the right in the case of data objects of fixed length. If the length of the interim result is shorter than the length of dobj, data objects of fixed length are filled to the right with blanks or hexadecimal zeroes. Data objects of variable length are adjusted. If data is cut off to the right when the interim result is assigned, sy-subrc is set to 2.
In the case of character string processing, the closing spaces are taken into account for data objects dobj of fixed length; they are not taken into account in the case of new.
System fields
sy-subrc Meaning
0 The specified section or subsequence was replaced by the content of new and the result is available in full in dobj.
2 The specified section or subsequence was replaced in dobj by the contents of new and the result of the replacement was cut off to the right.
4 The subsequence in sub_string was not found in dobj in the pattern-based search.
8 The data objects sub_string and new contain double-byte characters that cannot be interpreted.
Note
These forms of the statement REPLACE replace the following obsolete form:
REPLACE sub_string WITH
Syntax
REPLACE sub_string WITH new INTO dobj
        [IN {BYTE|CHARACTER} MODE]
        [LENGTH len].
Extras:
1. ... IN {BYTE|CHARACTER} MODE
2. ... LENGTH len
Effect
This statement searches through a byte string or character string dobj for the subsequence specified in sub_string and replaces the first byte or character string in dobj that matches sub_string with the contents of the data object new.
The memory areas of sub_string and new must not overlap, otherwise the result is undefined. If sub_string is an empty string, the point before the first character or byte of the search area is found and the content of new is inserted before the first character.
During character string processing, the closing blank is considered for data objects dobj, sub_string and new of type c, d, n or t.
System Fields
sy-subrc Meaning
0 The subsequence in sub_string was replaced in the target field dobj with the content of new.
4 The subsequence in sub_string could not be replaced in the target field dobj with the contents of new.
Note
This variant of the statement REPLACE will be replaced, beginning with Release 6.10, with a new variant.
Addition 1
... IN {BYTE|CHARACTER} MODE
Effect
The optional addition IN {BYTE|CHARACTER} MODE determines whether byte or character string processing will be executed. If the addition is not specified, character string processing is executed. Depending on the processing type, the data objects sub_string, new, and dobj must be byte or character type.
Addition 2
... LENGTH len
Effect
If the addition LENGTH is not specified, all the data objects involved are evaluated in their entire length. If the addition LENGTH is specified, only the first len bytes or characters of sub_string are used for the search. For len, a data object of the type i is expected.
If the length of the interim result is longer than the length of dobj, data objects of fixed length will be cut off to the right. If the length of the interim result is shorter than the length of dobj, data objects of fixed length are filled to the right with blanks or with hexadecimal 0. Data objects of variable length are adapted.
Example
After the replacements, text1 contains the complete content "I should know that you know", while text2 has the cut-off content "I should know that".
DATA:   text1      TYPE string       VALUE 'I know you know',
        text2(18) TYPE c LENGTH 18 VALUE 'I know you know',
        sub_string TYPE string       VALUE 'know',
        new        TYPE string       VALUE 'should know that'.
REPLACE sub_string WITH new INTO text1.
REPLACE sub_string WITH new INTO text2.

I need to append a string to another string

I'm working with some inherited code, I'm a Colf Fusion
novice myself, and I'm trying to make this order form display the
correct data. The problem is a lot of data in the database is
missing. Description in the QStockDB query can contain a lot of
stuff. For our full color work the text "4/0", "4/BLACK", and "4/4"
are consistent so I'm changing the newitem (I know, not very
descriptive but it's not my code) to CMYK Printing.
<cfif #QStockDB.description# contains "4/0"><cfset
newitem = "CMYK Printing"></cfif>
<cfif #QStockDB.description# contains
"4/4/BLACK"><cfset newitem = "CMYK Printing"></cfif>
<cfif #QStockDB.description# contains "4/4"><cfset
newitem = "CMYK Printing"></cfif>
I want to then go back through description and compare it
more to add more description. For instance with this:
<cfif #QStockDB.description# contains "12 pt"><cfset
newitem = newitem + " - BC"></cfif>
I know that the job is a business card. So I want to append
the newitem variable with " - BC". Likewise:
<cfif #QStockDB.description# contains
"catalog"><cfset newitem = newitem + " - Catalog
Sheets"></cfif>
displays CMYK Printing - Catalog Sheets. Or, it should... or,
more precisely, I want it to. :)
How do I append a string to another string?

+ is the addiion operator and works with numbers. Because
your string is a ...well, string... you need to use an ampersand.
Thus, instead of:
<cfif #QStockDB.description# contains
"catalog"><cfset newitem = newitem + " - Catalog
Sheets"></cfif>
Use...
<cfif #QStockDB.description# contains
"catalog"><cfset newitem = newitem & " - Catalog
Sheets"></cfif>
<cfoutput>#newitem#</cfoutput>
At least I think that will work - haven't tested it
though.

Double.parseDouble(String) - problems when string is in scientific notation

Hello guys,
I'm doing some numerical calculations and I wonder whether it is possible for Double.parseDouble(String) to parse string in the scientific notation i.e. 1.0824234234E-10. Is it the notation itself causing the exception : NumberFormatException or the number is just too big/small and double can't hold it ?
If it's just the notation how can I fix it ?
Regards

i'm not quite sure whether double odoes not allow it.
perhaps consider the api Double.valueOf() and the testing code provided; reproduced below:To avoid calling this method on a invalid string and having a NumberFormatException be thrown, the regular expression below can be used to screen the input string:
        final String Digits     = "(\\p{Digit}+)";
final String HexDigits = "(\\p{XDigit}+)";
        // an exponent is 'e' or 'E' followed by an optionally
        // signed decimal integer.
        final String Exp        = "[eE][+-]?"+Digits;
        final String fpRegex    =
            ("[\\x00-\\x20]*"+ // Optional leading "whitespace"
             "[+-]?(" + // Optional sign character
             "NaN|" +           // "NaN" string
             "Infinity|" +      // "Infinity" string
             // A decimal floating-point string representing a finite positive
             // number without a leading sign has at most five basic pieces:
             // Digits . Digits ExponentPart FloatTypeSuffix
             // Since this method allows integer-only strings as input
             // in addition to strings of floating-point literals, the
             // two sub-patterns below are simplifications of the grammar
             // productions from the Java Language Specification, 2nd
             // edition, section 3.10.2.
             // Digits ._opt Digits_opt ExponentPart_opt FloatTypeSuffix_opt
             "((("+Digits+"(\\.)?("+Digits+"?)("+Exp+")?)|"+
             // . Digits ExponentPart_opt FloatTypeSuffix_opt
             "(\\.("+Digits+")("+Exp+")?)|"+
       // Hexadecimal strings
       "((" +
        // 0[xX] HexDigits ._opt BinaryExponent FloatTypeSuffix_opt
        "(0[xX]" + HexDigits + "(\\.)?)|" +
        // 0[xX] HexDigits_opt . HexDigits BinaryExponent FloatTypeSuffix_opt
        "(0[xX]" + HexDigits + "?(\\.)" + HexDigits + ")" +
        ")[pP][+-]?" + Digits + "))" +
             "[fFdD]?))" +
             "[\\x00-\\x20]*");// Optional trailing "whitespace"
if (Pattern.matches(fpRegex, myString))
            Double.valueOf(myString); // Will not throw NumberFormatException
        else {
            // Perform suitable alternative action
http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Double.html

Converting from xsd:string into soapenc:string

Hi.
I was successfull in invoking an axis web service with complex type definitions.
However, when building and deploying the process flow, I get a warning message as follows:
" [bpelc] [Warning]: Trying to assign incompatible types
[bpelc] [Description]: in line 53 of "C:\eclipse\workspace\ComplexTypeWSFlow\TimeSheetProcess.bpel", <from> value type "{http://www.w3.org/2001/XMLSchema}string" is not compatible with <to> value type "{http://schemas.xmlsoap.org/soap/encoding/}string".
[bpelc] [Potential fix]: Please make sure that the return value of from-spec query is compatible with the to-spec query.
[bpelc]
[bpelc] [Warning]: Trying to assign incompatible types
[bpelc] [Description]: in line 58 of "C:\eclipse\workspace\ComplexTypeWSFlow\TimeSheetProcess.bpel", <from> value type "{http://www.w3.org/2001/XMLSchema}string" is not compatible with <to> value type "{http://schemas.xmlsoap.org/soap/encoding/}string".
[bpelc] [Potential fix]: Please make sure that the return value of from-spec query is compatible with the to-spec query."
My question is:
How can I convert between xsd:string and soapenc:string types when using the "assign" activity so I don't keep getting this warning message?
Regards

Hi Paulo,
This warning has been fixed in recent builds. eventhough soapenc:string is different type, it extends xs:string and its simple content. the compiler shouldn't display warnings for this case.

String to 2D string array conversion

Hi,
I have a string like this below. I would like to extract all the texts within the quotes " ". How to do that?.
05-Mar.20:52 skalyana label type "BASELINE_1.2" (locked)
28-Apr.19:19 skalyana label type "BASELINE_1.8"
i have tried using Match regular expression. I am able to extract one text within " ".
I would like to know how to extract all the text within " "
I have attached the vi for your reference
Thanks
Kalyan
Attachments:
string to 2D string array conversion.vi ‏19 KB

Hi Jim,
its simply superb...
how to get more info on these 'Regular Expressions', is there any KB (knowledge base) or tutorial available for the same.
I am not allergic to Kudos, in fact I love Kudos.
Make your LabVIEW experience more CONVENIENT.

Search string-1 in string-2 gives wrong results.

Hi,
I am searching for the string 'COM' in the sentence
below.
I am getting the string positons of string "COM"
as 1 and 16.
It Should be 1 and 19.
thanks
sharath
SET SERVEROUTPUT ON
DECLARE
str VARCHAR2(200):='COM-1 Hello world COM-1 speaking';
pos NUMBER ;
ps NUMBER :=0 ;
srch VARCHAR2(20) :='COM' ;
BEGIN
While( ps <= length(str))
Loop
pos := instr(str,srch);
If pos > 0 then -- found string COM
str := substr(str,pos + length(srch));
dbms_output.put_line('COM found in pos ==> ' || pos );
End If;
ps := ps + 1;
END LOOP;
END;

I believe the problem is that you are redefining the variable str within your loop. Once you find the first occurrence of "COM" in the string, you modify the string to remove that occurrence and then search again. The logic of your stored procedure is
Loop 1:
str = "COM-1 Hello world COM-1 speaking"
- first occurrence of COM is at position 1
Loop 2:
str = "-1 Hello world COM-1 speaking"
- first occurrence of COM is at position 16 in this new string
Since you are removing the first three characters of the string when you call substr at the beginning of the second loop, you're looking for the position of "COM" in a slightly different string the second time around, hence the confusion.
If you want to find the position in the original string, you'd want something like
CREATE OR REPLACE PROCEDURE findOccurrence( string IN varchar2, search IN varchar2, offset IN number)
AS
currentPosition NUMBER;
BEGIN
currentPosition := INSTR( string, search );
IF( currentPosition > 0 )
THEN
    dbms_output.put_line( 'Search string found at position ==> ' || to_char(currentPosition+offset));
    findOccurrence( substr( string, currentPosition+length(search) ),
                    search,
                    currentPosition+length(search)+offset-1 );
END IF;
END;
scott@jcave > exec findOccurrence( 'COM COM COM', 'COM', 0 );
Search string found at position ==> 1
Search string found at position ==> 5
Search string found at position ==> 9
PL/SQL procedure successfully completed.Justin
Distributed Database Consulting, Inc.
http://www.ddbcinc.com/askDDBC

String[] args fights String... args

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