Basic import statement

I have a question whenever I want to print out any string, value, I always use
System.out.println("some string");
System.out.print("some string");
System.out.printf("%s", "some string");my question is: is there anyway that I can write shorter code?
.out.println("hihi") or just .println("hihi"); I think there must be something to do with the import statement, but just I cant get it to work.

DO NOT do this. Your laziness will result in unreadble code for others. Anyone who looks at your code will know what System.out.println() means. Whereas they do not know what someObscureMethodName() is or does.

Similar Messages

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."

Java import statement problems

Hello...
I have the book "Java in a Nutshell, 2nd ed" and have a query about a nested top-level interface example they have in the book.
Basically there's two files/classes. The first, LinkedList.java, is as follows:
public class LinkedList {
    public static interface Linkable {
        // Linkable interface details here
    // rest of LinkedList class here
Next is LinkedList.java as follows:
import LinkedList.*;
class LinkableInteger2 implements Linkable {
    // rest of LinkableInteger2 class here
Now I thought the import statement had two forms - and both used a package name as part of the statement:
import package.class;
import package.*;
Obviously, neither class has a package statement.
As written, these classes do not compile. Am I right in assuming the lack of a package name is causing this problem, or is there something else going on here?
Thanks...
Mark.

Since you don't have package statements in the files, the classes are being placed in the default package. You cannot explicitly import classes from the default package. Al classes in the default package, the java.lang package and the current package are always imported automatically. Your import statement is incorrect - remove it.

Which one better to use - jsp:useBean or import statement

Hi,
I just want to know that which one is better to use jsp:useBean or import statement .
I can instantiate and call method of myclass -
1) by importing the class through import tag in jsp as <%@page import="myclass"%. or
2). by using <jsp:useBean tag....
i have these two option to do the same thing. i know that basically useBean is used to call setter and getter method of bean class and but it can be used to call a normal java file that have some logic .
so what should i used , which one is better and why?
useBean provides scope and object instance so no need to create object by new operator. and with import you have to create an instance .
but which tag should i use in my jsp?
i am confused???

ok, means i can use jsp:useBean tag for all my
classes that are not actually bean. so it will be
instantiated at run time and provide efficiency .No. Jsp:useBean is used for java bean components.
>
but when should i use import statement in my jsp and
it happen at translation time so will it create any
type of burden for my code if i import multiple
classes.For non-java beans, you need to import the classes, period.
It's not a burden, it's a necessity.

Newbie question : import statements

So, i'm a complete java newbie trying to make his first swing application, a basic calc. I download NetBeans 6.5, install it, and begin to code. I quickly learn about the Matisse GUI editor, find it very easy to use, and in a couple hours, the work is done and runs very fine.
But looking at my code, I realize I have forgotten all import statements (like import javax.swing, import java.awt.event ....), nevertheless the application runs fine. I suppose then that the Netbeans compiler automatically corrects my mistakes, but I want to do it right.
So, I write the import statements explicitly in my code and I get a warning message : "import unused". After that, I find out about the "fix import" tool in Netbeans, use it and all my import statements disappear. I guess i'm missing something here.
I thought import of swing classes were mandatory to write a swing application. I have NO import statement in my code, even if I'm using jFrames, jButtons, event handlers and the program works fine, why ?
Would I be able to compile this importless code in another environment (let's say Eclipse or even javac) ?
I'm using JDK 1.6 and Netbeans 6.5 with Windows XP.
TIA

glawen wrote:
Ok, thanks for the answers, and sorry for my misinterpretation of BigDaddyLoveHandles's first post. I understand now, the import statements are useful only if you don't want to write full class names, and the generated code uses full class names so no import needed.Please also understand BigDaddyLoveHandles's latest post. If you learn to code Swing with NetBeans' Matisse, then you will be learning Matisse, not Swing. When it comes time to try to tweak or upgrade your program, you will be lost. Better is to learn Swing from the ground up by going through the Sun Swing tutorials. Though having said that, if you are very new to the language, better still is to learn the fundamentals of Java first before embarking in the murky waters of GUI programming. Best of luck to you in your endeavors.

Filename in import statement

Hi srinivas bobbala,
Thank you for your response.But I think my quesition was not clear.My ques... is for suppose there is one datafile for importing like.. "datafile_21" Here my intention is it takes file from datafile_21 only but it appears in import statement like datafile_21<<curmon>>.
import database sample.sample data from data_file "c:\\ABC\datafile_21_AUG.txt" using server rules_file datafile on error abort;
In this it takes datafile from datafile_21.But it appears like datafile_21_AUG in import statement.This AUG coming from batch file.
Essmsh c:\\ABC\loadmxl.mxl %curmon%

No it is not possible.
I assume the data file "datafile_21" is first renamed to datafile_21_${CurrMth} in the batchscript.
After that this data file *datafile_21_${CurrMth}* is pointed in the import statement.
In the logs you will see this file as datafile_21_Aug.

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

Import Statement Error

Does anyone know what is wrong with these import statement?
import Reduction;
import Mapper;
import ApplyObj;
import ApplyObjUnary;
import java.lang.String;
public class Driver{
public static Driver me = new Driver();
public static void main(String[] args){
int i;
I places all my *.java file in the same directory as Driver.java
But when i try to compile Driver.java, it says :-
C:\assignment1>javac Driver.java
Driver.java:10: '.' expected
import Reduction;
^
Driver.java:11: '.' expected
import Mapper;
^
Driver.java:12: '.' expected
import ApplyObj;
^
Driver.java:13: '.' expected
import ApplyObjUnary;
^
4 errors
I set my class path as
C:\>SET CLASSPATH = .;C:\j2sdk1.4.0_01;c:\assignment1
Apparently, the current directory has been set and my assignment1 directory has been set.
Did i miss out anything? Why does it can't recognize the existence of other class file in the same directory?
thanks.

You don't need to import classes that are in the default package (i.e. you didn't put them in a package). And in Java 1.4, you can't import them. Just remove the import statements, you shouldn't need them.

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 - Which is Better ???

Which import statement is better? Are there any performance advantages of calling the ones you need explicitly instead of using the shorthand (.*)?
import java.util.*
or
import java.util.Vector;
import java.util.TreeMap;

there is no runtime performance difference. There could be a difference in compliation time if you use wildcards, but even that difference would probably be insignificant (plus, is compile time usually a concern in java?). The main advantage to importing only the classes you need, as the previous poster pointed out, is to reduce compilation ambiguities (e.g. does 'Date' refer to java.sql.Date or java.util.Date). For example, a recent poster just reported a problem where he imported java.beans.* and java.sql.* and, after upgrading to 1.4, none of his code compiles because both packages now have a Statement class, which causes ambiguities. As a general rule, it is best to import only the classes you need.

Import statement .. what does it do ??

Hi All,
What is IMPORT statement doing ??
IMPORT order_items_in to w_order_items_in from MEMORY ID
'FREEGOODSTERMS'.
can you kindly explain what this statement is doing ?
I was by my friend that this is used to pass order_items from one session to this sesssion, but when I searched for FREEGOODSTERMS, I could find export after this statment. I was wondering how can import me first and then export.
Please let me know.
Thanks
venkat.

Hello Venkat,
Sorry for late reply..
Please see the program which other program submitting somewhere.
if they are using multiple purpose then export and import statement may possible in one include.
Best way just use where used list for that include and other programs searching like export and submit..
For better understanding about export and import then see the below sample programs.
Create one program and paste below code :
REPORT ZTEST_AMEM1.
tables : lfa1.
data : begin of i_lfa1 occurs 0 ,
       lifnr like lfa1-lifnr,
       name1 like lfa1-name1,
       land1 like lfa1-land1,
       end of i_lfa1.
start-of-selection.
select lifnr
       name1
       land1 from lfa1
       into table i_lfa1 up to 100 rows.
Export
export i_lfa1 to memory id 'SAP'.
submit ztest_amem2 and return.
write:/ 'hello'.
Now create one more program and paste below code :
REPORT ZTEST_AMEM2.
data : begin of j_lfa1 occurs 0,
       lifnr like lfa1-lifnr,
       name1 like lfa1-name1,
       land1 like lfa1-land1,
       end of j_lfa1.
start-of-selection.
import i_lfa1 to j_lfa1 from memory id 'SAP'.
loop at j_lfa1.
write:/ j_lfa1-lifnr,j_lfa1-name1,j_lfa1-land1.
endloop.
Thanks
Seshu

Import statement for DateCalculator

Hi
What import statement should I add in my wed dynpro implementation for DateCalculator, I already added
import java.util.Date;

Hi,
If you want to perform some opperation with date in webdynpro,we have to import the some more along with above mentioned.like
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
Thanks,
Murthy.

Basic import statement

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