Import Statement Different ways to refer ???

Dear Friends,
Can any one help me the difference between the usage of import statement....
1. using import statement
2. using the class directly
that is,
for example ;
1. import java.util.Date;
Date dt = new Date();
2. java.util.Date dt = new java.util.Date();
what's the difference between two reference of Date class...is there any meaning beyond this ?????
Regards,
V.Prasanna

what's the difference between two reference of Date
class...is there any meaning beyond this ?????there is no difference once the code is compiled - the compiler resolves single class names to their fully-qualified names (ie with the package prefix) and that appears in the .class file constant pool
before compilation then my opinion is that having all the imports at the top of the file is good practice because you can see what is being used easily

Similar Messages

Is there a different way to open a cursor for a ref cursor procedure?

hello everybody
i have two cursors, cur_a and cur_b, declared somewhere else in my application.
These two cursors have the same fields, in the same order, and i have to treat both in the same way. So i wrote a routine that gets as input a ref cursor based on the cur_a rowtype, and i am trying to use this routine for both.
The problem is that i am not able to open outside the routine the cursor in a different way than usual...
the common method is :
declare curs ref cursor ...
begin
open curs for (select *...)
end;
instead i would like to obtain something different
declare curs ref cursor ...
begin
open curs for cur_a
end;

hi
thanks for answering
i wanted just to give a better idea, anyway you were near to get it.
the only difference is that the two cursors are not written in dynamic sql, just like strings, but are real cursors.
anyway, this is the version of the package i need, but i am not able to compile
(your original code is commented and immediately below there is my code)
CREATE OR REPLACE PACKAGE BODY mytest
IS
--cur_a VARCHAR2(200) := 'SELECT dummy FROM DUAL';
CURSOR cur_a
IS
SELECT dummy
FROM DUAL;
--cur_b VARCHAR2(200) := 'SELECT ''fred'' FROM DUAL';
CURSOR cur_b
IS
SELECT 'fred' fred
FROM DUAL;
TYPE t_cur_a IS REF CURSOR
RETURN cur_a%ROWTYPE
--PROCEDURE routine_a_b (p_cur SYS_REFCURSOR) IS
PROCEDURE routine_a_b (p_cur t_cur_a)
IS
v_x VARCHAR2 (10);
BEGIN
LOOP
FETCH p_cur
INTO v_x;
EXIT WHEN p_cur%NOTFOUND;
DBMS_OUTPUT.put_line (v_x);
END LOOP;
END;
PROCEDURE doit
IS
--v_curs SYS_REFCURSOR;
v_curs t_cur_a;
BEGIN
NULL;
-- open v_curs FOR cur_a;
OPEN v_curs FOR cur_a;
routine_a_b (v_curs);
CLOSE v_curs;
-- open v_curs FOR cur_b;
-- routine_a_b(v_curs);
-- close v_curs;
END;
END;
the error is:
cursor 'V_CURS' cannot be used in dynamic SQL OPEN statement
i did read that if use weak ref cursor, it could work, so i declare the ref cursor type in this way:
TYPE t_cur_a IS REF CURSOR;
instead than
TYPE t_cur_a IS REF CURSOR
RETURN cur_a%ROWTYPE
what i get is another error (in the open cursor command)
PLS-00382: expression is of wrong type....
but if i replace
OPEN v_curs FOR cur_a;
with
OPEN v_curs for select dummy from dual;
it works... but i already knew it.. :-)
anyway, i used a work around to resolve it, so it's just philosophy

Different ways to referencing Session State variables

Hi,
According to APEX documentation there's 4 different ways to reference session state variables: http://download-west.oracle.com/docs/cd/B32472_01/doc/appdev.300/b32471/concept.htm#BEICHBBG
In an inline PL/SQL statement, what's the difference when using the different methods? I remember reading something that the bind and static text have a size restrictions. What's the difference between the V() and NV() functions?
Thank you.
Martin

Martin,
In PL/SQL, the preferable method is to use bind variable notation, e.g., :P1_ITEM. In HTML contexts, you must use &ITEM. notation. In stored procedures, you can use v or nv, the latter function being identical to the former with the additional characteristic that it raises an exception if the retrieved value is non-numeric.
Scott

Different ways to import 24fps video into DVD SP?

Hello.
I am making a NTSC HD DVD with 1280x720 24fps video clip, and there are few things that's not clear to me...
In the mannual, it says that 'if you import 24fps MPEG-2 assets, they are handled correctly and remain 24fps when you build the project.' 'If you import 24fps QuickTime assets, they are encoded as either 29.97fps or 25fps MPEG-2 files, based on your project's video standard, and no longer 24fps when you build the project.'
If I want to keep 24fps, should I definitely encode to MPEG-2 with Compressor? Or those are just the 2 different ways to result in the same end since 24fps will be played with 3:2 pull down in DVD player? Will there be any quality difference between the two method?
Also, I did a test HD authoring, and I made an 720p mpeg2 with 23.97fps. Yet, when I import it to the project, Frame Rate in Video Asset says 59.94... I am sure that I select 23.97 for encode setting in Compressor. Does anybody have any clue for this?
Many thanks in advance.
Dual 2.3 GHz PowerPC G5 Mac OS X (10.4.3)

Cinematize works great. You can select portions or the entire DVD. It will not read encrypted DVD's so assuming you are using media that you have rights to it will do fine.
You can import in several compressions. If you like you can import only the audio, only the video, etc. It will give you a QT file at the end.
http://www.miraizon.com/products/products.html

Write a SELECT statement in different ways is not the same thing!!!

Let's take a look
use AdventureWorks2012
go
dbcc freeproccache
go
and now select something
select * from [HumanResources].[vEmployeeDepartmentHistory]
go
so, analyzing 'Compiled Plan'
SELECT usecounts, cacheobjtype, objtype, text
FROM Sys.dm_exec_cached_plans
CROSS APPLY sys.dm_exec_sql_text(plan_handle)
where cacheobjtype = 'Compiled Plan'
ORDER BY usecounts DESC;
GO
and now let's write some SELECT in "fuzzy case"
dbcc freeproccache
go
select * from [HUMANResources].[vEmployeeDepartmentHistory]
go
select * from [HumanRESOURCES].[vEmployeeDepartmentHistory]
go
select * from [HumanResources].[VEmployeeDepartmentHistory]
go
select * from [HumanResources].[vEmployeeDEPARTMENTHistory]
go
select * from [HumanResources].[vEmployeeDepartmentHISTORY]
go
SELECT * from [HumanResources].[vEmployeeDepartmentHistory]
go
select * FROM [HumanResources].[vEmployeeDepartmentHistory]
go
and now let's see compiled plans again
SELECT usecounts, cacheobjtype, objtype, text
FROM Sys.dm_exec_cached_plans
CROSS APPLY sys.dm_exec_sql_text(plan_handle)
where cacheobjtype = 'Compiled Plan'
ORDER BY usecounts DESC;
GO
So, write a SELECT statement in different ways is not the same thing!!!
Hope it'll be useful
P.Ceglie

Yes. There is little or no query normalization that happens in front of the query plan cache. It would be a performance tradeoff to parse and normalize the query before matching it to the cached plans. The benefit of reducing the number
of plans in the cache probably wouldn't be worth it.
David
David http://blogs.msdn.com/b/dbrowne/

Repeating same import statement in different source files

If we have to repeat same bunch of import statements in all the java classes do we have an alternative rather than declaring the same import statements in all the java classes.

ryaliscs wrote:
Then don't you think its waste to repeate the same line in every class. Even if we have to chance one statement we have do it in all the classes say for example today I am using an object from "abc.ab.c" and tomorrow some one changes the package to "abc.ba.c" then we have to update the same in all of the classes where ever we use "abc.ab.c" earlier.Not especially. IDEs do the heavy lifting, and what would you think could be an alternative? Global implicit imports, configured on the compiler? Don't like that idea. Explicitly declaring exactly what imports each class has is a very good indicator of certain code smells, like god classes and the like. If I have to hunt around for what classes a particular piece of source is using, that's an extra hoop I'd rather not jump through
If you're finding it a bind to have to re-import huge amounts of classes into loads of other classes, that in itself is a good indicator you've got design problems

PreparedStatement & regular Statement - different results for same select

I was wondering if someone could either
i) try this out for me to confirm my results or
ii) let me know what I am doing wrong
I'm one of the developers on a product and am currently investigating localization for the Thai language...just checking to see that Java and Swing have no problems with it. The only bewildering thing which has happened is noticing that some values which are fetched from the database display in Thai perfectly and other values display as a garble. Sometimes the exact same column is displayed correctly in one part of the program but is not OK in another part. I think I've figured out what it going on and suspect a bug in Oracle's JDBC:
Some selects were configured as PreparedStatements and those return the Thai properly. The more common case however was for programmers to use a simple Statement object for their select and it is in those that the multi-byte strings don't get returned properly.
The following code shows the problem that I am experiencing. I am basically executing the exact same select in 2 different ways and they are both giving different results as long as the column being queried contains a Thai character. If someone could grab and check it out and let me know if they see the same thing, I'd appreciate it. Just change the column/table name and the username/password/databaseIP to get it to run.
<code>
import java.sql.*;
public class SelectTest {
public static void main(String[] args) {
try {
DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
Connection conn = DriverManager.getConnection( "jdbc:oracle:thin:@10.4.31.168:1524:ora8",
"dms_girouard",
"girouard");
String sqlCommand = "select C0620_Title from T0620_SwSheet";
Statement statement = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,
ResultSet.CONCUR_READ_ONLY);
ResultSet resultSet1 = statement.executeQuery(sqlCommand);
while (resultSet1.next()) {
if (resultSet1.getString("C0620_Title") != null) {
System.out.println("resultSet1 Title = " + resultSet1.getString("C0620_Title"));
PreparedStatement preparedStatement = conn.prepareStatement(sqlCommand);
ResultSet resultSet2 = preparedStatement.executeQuery();
while (resultSet2.next()) {
if (resultSet2.getString("C0620_Title") != null) {
System.out.println("resultSet2 Title = " + resultSet2.getString("C0620_Title"));
catch (Exception e) {
System.out.println(e.getMessage());
</code>

Hi Peter,
Are you using NCHAR column for Thai , or is your database character set set for Thai.
If you are using a NCHAR column for holding Thai data, then you have to use the
OraclePreparedStatement.setFormOfUse(...) before executing the select.
Regards
Elango. Hi Elangovan,
Thank you for answering.
The datatype on the column is VARCHAR2.
I did my initial tests without doing anything special to make sure the database is localized for Thai, and I was happy to find that almost everything still worked fine - I was able to save and retrieve Thai strings to the database almost perfectly.
The only problem I discovered was the difference between Statement and PreparedStatement selects on a column containing Thai. Colleagues of mine have said they see the same thing when testing on a Oracle database which has been configured specifically for the Thai customer.
I read somewhere that the current JDBC drivers are using an older version of the Unicode standard than the most current version of the Java SDK and that it was causing some problems with Korean. I'm wondering if maybe it's the same problem with Thai.

Import statement *not* required?

Can someone explain this to me? I was following along a
simple AS3 example (in the design video workshop) where a "Power
Button" has some MouseEven CLICK event handling applied to it with
a trace statement as the resulting handled function. Really simple
basic example. The import statement is import
flash.events.MouseEvent.
How come removing the import statement does not produce an
error?
Reference:
import flash.events.MouseEvent;
myButton.addEventListener(MouseEvent.CLICK, myButtonClicked);
function myButtonClicked(event:MouseEvent):void {
trace('do Something');
}

midimidi,
> So to be clear...if the AS is on the main timeline,
import statements
> are not needed, and if the AS is external and imported,
import
> statements are needed.
That's a general rule of thumb, but not 100% applicable.
> Are there any other exceptions to that, or does that go
for all AS3
> classes?
There are exceptions, and the easiest way to find them is to
leave out
your import statements and plug away ... sooner or later,
you'll get a
compiler error, and then you'll know. :)
>> It did strike me *** odd though, an imported .as
file uses the same
>> publish settings as code on the timeline. So why
treat them differently?
FLA files have publish settings, but AS files don't. They're
just text
files. I hear what you're saying ... they end up getting
compiled along
with / into the some FLA anyway -- and that FLA does have
classpaths
listed -- but those same AS files might be compiled in Flex
Builder 2 or
some 3rd party compiler. It would probably make good sense to
require the
import statement for inline FLA code, but not everyone is a
hardcore
programmer, and Adobe knows it. Nothing is *hurt* by using
import in FLAs,
but for folks who just want to do light programming, the
convenience of not
having to use it is nice.
David Stiller
Adobe Community Expert
Dev blog,
http://www.quip.net/blog/
"Luck is the residue of good design."

Confused about CLASSPATH and how java handles import statements...

Hello,
I must admit I don't get it. I read the articles about setting CLASSPATH etc. but I still wonder:
If you use an import statement, what does the compiler do? I.e. where does it look for the specified classes? I find it confusing because I see in different locations different .jar files:
C:\jdk1.3.1_03\lib\dt.jar
C:\jdk1.3.1_03\lib\htmlconvertor.jar
C:\jdk1.3.1_03\lib\tools.jar
and also
C:\jdk1.3.1_03\jre\lib\i18n.jar
C:\jdk1.3.1_03\jre\lib\rt.jar
C:\jdk1.3.1_03\jre\lib\jaws.jar
C:\jdk1.3.1_03\jre\lib\sunrassign.jar
Can someone explain me what the purpose is of these files?
And why do I have the same contents in
C:\Program Files\JavaSoft\JRE\1.3.1_03\lib
and in
C:\jdk1.3.1_03\jre\lib
Why is that?
Thanks for answering my questions!
-mike

Thanx for the answers, but I still wonder, everyone
here says I need to set the classpath, but I don't.Probably because your classes are already in the class path. The compiler/jvm also look for classes by themselves not just in jar files, when just a directory is supplied in the class path. And a period (".") is a valid directory.
Programs importing different classes compile with no
problem. So what's up with that?
Presumably you are referring to your own code - because they are in the class path.
Second, I still don't understand why the runtime needs
the .jar files. The runtime uses classes, like String, that have to come from somewhere.
This would also mean that end-users
need to set the classpath to the .jar files in their
JRE directory to be able to run programs that import
classes from these .jars. But this is not true, right?No it is true. The end-users will have to set the class path. There are variations on this which make it seem like no class path is set. For instance applets in a browser are java but the end-user does not need to set a class path. That is because the browser knows how to download classes/jars and how to set it up so it uses them. (Actually it uses a class loader, but that is probably more information that you need.)
Because if I make some nice classes myself and import
them, how can I expect my end-user to install these
classes and make a classpath for them?That would be between you and you end-user.
First installation is not part of java. For installation you will have to find something outside of java to accomplish the goal.
Additionally how the class path gets set is OS specific. Java does not deal with that. You will also have to find some way to deal with this (most likely part of the installation.)
There are also variations on this. For example the browser example I gave above. Or using the ext directory. Or creating an executable jar. Or simply setting the class path.
In my understanding it should only be needed in the JDK, not
in the JRE. True or am I mistaken?Mistaken. The class path is needed in the JRE as well. You will need to set it.

Java import statement memory problem

Hi,
will java.io.* loads all the classes in io package to the memory? will it afftect the program performance?

RajBabu wrote:
I hope that import statement might present in a java class fileNo, import statements are in no way represented in the java class files. All references to external classes are made via their fully quallified class names in a class file (com.foo.Bar and not just Bar*).
Imports only serve as a shortcut so that you don't have to write the full class name everywhere in your Source code. You could just as well write a program without using any import statements, just by using the fully qualified class names of each class you use and it would produce the same class files (although the source code would be rather unreadable).
* actually the format is different, but the idea is the same

Auto created import statements

I create a var of some type and the builder adds the import
statement and then if I change the type later on it adds another
import statement, is there a way to cleanup the unused import
statements?
Thanks,
Mike

Sadly, no.
There are a couple of different ways we might do this in
future. If we are able to get to an "organize imports" feature in
the next release, we could attempt to identify and remove obsolute
imports in addition to putting the imports in order.
Alternatively, if we can talk the compiler team into adding a
compiler warning for unused imports (which I don't believe it does
this currently), then we could make a quick fix that targets the
problem directly.
I'll make sure there's an enhancement request filed for this.
Rebecca Hyatt
Adobe

IMPORT Statement Issue (Internal Table)

Hi All,
I am using an IMPORT statement to get all the data from other report's internal table. Now whenever this (the other report's internal table) is changed (for field addition, etc), my report throws a dump. Hence, everytime I have to add these fields in my program as well.
Is there any way by which I can include the whole internal table of that report in my program just like
'INCLUDE STRUCTURE VBRK'.
Thanks in advance

Hi, CHeck this code related to your problem..This will helpful to you...
I have done this program earlier..I hope it will helpful to u..
This programa calling the other program to import the data..
Check it out...
*" Tables declarations.................................................
TABLES:
spfli.
*" Type declarations...................................................
Type declaration of the structure to hold data from table SPFLI     *
TYPES:
BEGIN OF type_s_spfli,
    carrid LIKE spfli-carrid,          " Carrier Id
    connid LIKE spfli-connid,          " Connection Number
    cityfrom LIKE spfli-cityfrom,      " City from
    cityto LIKE spfli-cityto,          " City to
    airpfrom LIKE spfli-airpfrom,      " Airport from
    airpto LIKE spfli-airpto,          " Airport to
    countryfr LIKE spfli-countryfr,    " Country from
    countryto LIKE spfli-countryto,    " Country to
END OF type_s_spfli.
Data Declaration...................................................*
     Field String To Hold Flight Details Record from SPFLI          *
DATA
fs_spfli TYPE type_s_spfli.
Data Declaration...................................................*
     Internal Table To Hold Flight Details Records from SPFLI       *
DATA
t_spfli LIKE STANDARD TABLE OF fs_spfli.
TYPES:
BEGIN OF types_s_itab,
    carrid LIKE sflight-carrid,        " Carrier id
    connid LIKE sflight-connid,        " Connection number
    fldate LIKE sflight-fldate,        " Flight date
END OF types_s_itab.
Data Declaration...................................................*
     Field String To Hold Flight Details Record from SFLIGHT        *
DATA
fs_itab TYPE types_s_itab.
Data Declaration...................................................*
     Internal Table To Hold Flight Details Records from SFLIGHT     *
DATA
t_itab LIKE STANDARD TABLE OF fs_itab.
*" Type declarations...................................................
Type declaration of the structure to hold data from table SBOOK     *
TYPES:
BEGIN OF type_s_sbook,
   carrid LIKE sbook-carrid,           " Carrier Id
   connid LIKE sbook-connid,           " Connection Number
   fldate LIKE sbook-fldate,           " Flight date
   bookid LIKE sbook-bookid,           " Booking number
   loccuram LIKE sbook-loccuram,       " Local currency
   loccurkey LIKE sbook-loccurkey,
   order_date LIKE sbook-order_date,   " Booking date
END OF type_s_sbook.
Data Declaration...................................................*
     Field String To Hold Flight Details Record from BOOK           *
DATA
fs_sbook TYPE type_s_sbook.
Data Declaration...................................................*
     Internal Table To Hold Flight Details Records from SBOOK       *
DATA
t_sbook LIKE STANDARD TABLE OF fs_sbook.
DATA
w_checkbox.                          " Checkbox
SELECT-OPTIONS:
s_carr FOR spfli-carrid.             " Carrier id range
                      START-OF-SELECTION EVENT                      *
START-OF-SELECTION.
PERFORM selectq.
                      END-OF-SELECTION EVENT                        *
END-OF-SELECTION.
SET PF-STATUS 'YH1314_030502'.
PERFORM display_basic.
AT USER-COMMAND.
PERFORM ucomm.
*&    Form selectq
    This subroutine retreive data from SPFLI table
There are no interface parameters to be passed to this subroutine.
FORM selectq .
SELECT carrid                        " Carrier id
         connid                        " Connection number
         cityfrom                      " City from
         cityto                        " City to
         airpfrom                      " Airport from
         airpto                        " Airport to
         countryfr                     " Country from
         countryto                     " Country to
         INTO CORRESPONDING FIELDS OF TABLE t_spfli
         FROM spfli
         WHERE carrid IN s_carr.
ENDFORM.                               " Selectq
*&      Form display_basic
    This subroutine displays data from internal table
There are no interface parameters to be passed to this subroutine.
FORM display_basic .
LOOP AT t_spfli INTO fs_spfli.
    WRITE:
      / w_checkbox AS CHECKBOX,
        fs_spfli-carrid,
        fs_spfli-connid,
        fs_spfli-cityfrom,
        fs_spfli-cityto,
        fs_spfli-airpfrom,
        fs_spfli-airpto,
        fs_spfli-countryfr,
        fs_spfli-countryto.
ENDLOOP.                             " LOOP AT T-SPFLI INTO...
ENDFORM.                               " Display_basic
*&      Form UCOMM
This subroutine for at user-command event
There are no interface parameters to be passed to this subroutine.
FORM ucomm .
RANGES :
    r_carr FOR spfli-carrid,
    r_conn FOR spfli-connid,
    r_carrid FOR sflight-carrid,
    r_connid FOR sflight-connid,
    r_fldate FOR sflight-fldate.
CASE sy-ucomm.
    WHEN 'DISPLAY'.
      DATA:
        lw_lines TYPE i,
        lw_lineno TYPE i VALUE 3.
      DESCRIBE TABLE t_spfli LINES lw_lines.
      DO lw_lines TIMES.
        READ LINE lw_lineno FIELD
             VALUE w_checkbox   INTO w_checkbox
                   fs_spfli-carrid INTO fs_spfli-carrid
                   fs_spfli-connid INTO fs_spfli-connid.
        IF sy-subrc = 0.
          IF w_checkbox = 'X'.
            r_carr-sign = 'I'.
            r_carr-option = 'EQ'.
            r_carr-low = fs_spfli-carrid.
            APPEND r_carr.
            r_conn-sign = 'I'.
            r_conn-option = 'EQ'.
            r_conn-low = fs_spfli-connid.
            APPEND r_conn.
          ENDIF.                       " IF W_CHECKBOX = 'X'
        ENDIF.                         " IF SY-SUBRC = 0
        ADD 1 TO lw_lineno.
      ENDDO.                           " DO LW_LINES TIMES
      SUBMIT yh1314_030502_call
        WITH s_carr IN r_carr
        WITH s_conn IN r_conn
         AND RETURN.
      IMPORT t_itab FROM MEMORY ID 'YH1314'.
      LOOP AT t_itab INTO fs_itab.
        r_carrid-sign = 'I'.
        r_carrid-option = 'EQ'.
        r_carrid-low = fs_itab-carrid.
        APPEND r_carrid.
        r_connid-sign = 'I'.
        r_connid-option = 'EQ'.
        r_connid-low = fs_itab-connid.
        APPEND r_connid.
        r_fldate-sign = 'I'.
        r_fldate-option = 'EQ'.
        r_fldate-low = fs_itab-fldate.
        APPEND r_fldate.
      ENDLOOP.                         " LOOP AT T_ITAB INTO.....
      SELECT carrid                    " Carriee Id
             connid                    " Connection number
             fldate                    " Flight date
             bookid                    " Booking number
             loccuram                  " Local Currency
             order_date                " Booking date
         INTO CORRESPONDING FIELDS OF TABLE t_sbook
         FROM sbook
         WHERE carrid IN r_carrid AND
               connid IN r_connid AND
               fldate IN r_fldate.
      IF SY-SUBRC NE 0.
        MESSAGE 'NO RECORDS FOUND'(006) TYPE 'S'.
      ENDIF.                           " IF SY-SUBRC NE 0
      LOOP AT t_sbook INTO fs_sbook.
        AT FIRST.
          WRITE: /5 'Carrier Id'(001),
                 20 'Conn Id'(002),
                 35 'Flight date'(003),
                 50 'Book Id'(004),
                 65 'Local Currency'(005).
        ENDAT.                         " AT FIRST
        WRITE: /5 fs_sbook-carrid,
               20 fs_sbook-connid,
               35 fs_sbook-fldate,
               50 fs_sbook-bookid,
               65 fs_sbook-loccuram CURRENCY fs_sbook-loccurkey.
      ENDLOOP.                         " LOOP AT T_SBOOK INTO.....
ENDCASE.                             " CASE SY-UCOMM
ENDFORM.                               " UCOMM
Regards
Kiran

Import statement is not working

hi everybody,
I have a directory under which I have a number of sub-directories. Lets call this directory "parent_directory". under this directory I have another directory called "child_1". Under "child_1" I have another subdirectory called "child_2". Now I have a code in child_2 that has the following statement:
import program_1;
//this is a program present in the parent directory. lets call it
//program_1.java
when I am compiling I am getting an error saying:
program_2.java:28: '.' expected
import program_1;
^
1 error
program_2.java is the program present in child_2 in which I have included the import statement.
If I change the ";" to "." then again error appears as the import statement only needs the name of the class and doesnot need the extension.
I will be very grateful to you if you could please suggest me a way around this.

This questions belongs in the "New to Java" forum ...
sigh
Anyways, import works on package names with trailing * or full qualified class names, e.g.import mypackage1.*; // imports all classes in mypackage1
import mypackage2.MyClass2; // imports MyClass2 from mypackage2So instead of import program_1; you need to do
1. ensure that program_1 is in some package
2. ensure that your directory structure mirrors your package structure (same names!)
3. ensure that your CLASSPATH is either not set at all or points to the parent dir of your topmost package
Example:
Directory structure:C:\tmp\java\top\
C:\tmp\java\top\MyClass1.java
C:\tmp\java\top\bottom\
C:\tmp\java\top\bottom\MyClass2.java
CLASSPATH=".;<java install dir>\jre\lib\rt.jar;C:\tmp\java"Source for MyClass1.java:package top;
public class MyClass1 {
}Source for MyClass2.java:package top.bottom;
import top.MyClass1;
public class MyClass2 {
private MyClass1 myClass1;
}

Import Statement without ID Specification

There is an import statement
IMPORT tab g_acc_tab FROM MEMORY.
While UCChecking it.. it saying that
import statement without id specification is only used for the sake of r/2 ......
Can i Comment it ? If so won't my application go into dump while running on 6.0cc???

It has to do with packages. Most java classes are in a package, the name of which must conform to its place on the filesystem relative to the classpath. By that I mean that if you have com.mystuff.One.java, it must be in a folder com/mystuff where com is located somewhere in the classpath.
What you've done is a little different. I'm assuming a couple of things:
1. you have no package declaration at the top of one.java or two.java
2. you have the current directory "." in your classpath.
Java has the concept of the "default package", which covers classes without a declared package, and in your case is the current directory.
So when you're in c:\sourcefolder and run the compiler, then "."="c:\sourcefolder", and that directory is part of the default package. No import statements are necessary for classes that are in the same package. This is why two.java can call methods in one.java without an import statement.
When you run your jsp, the "current directory" part of your classpath is not c:\sourcefolder, but some other value (probably the directory you start your jsp engine from) You will have to import all non-java-library classes because the jsp itself becomes a java class, with a package that is determined by the jsp engine.

Import statement -- Filesize^

How does the import statement work anyway?
Will it just "paste" the imported files in front of th class like a C preprocessor?
If so, is there a way to import packages only once?
I use (e. g.) java.awt.point in nearly ALL classes in my project, and at the moment, I import the class in every single file. If it will be pasted, this will significantly enlarge my project, I fear. Or does the compiler recognize double imports?

How does the import statement work anyway?The import statement just gives the compiler some info so you don't have to fully qualify the class names.
Will it just "paste" the imported files in front of th
class like a C preprocessor?No
It doesn't put anything into the compiled class, so won't affect the file size.

Import Statement Different ways to refer ???

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