why we use the symbol $ java variable?

Similar Questions

• Why use the symbol {} in the following script?

  Why use the symbol * {} * in the following script?
  < reading-writing-support-map-plan >
  < scheme name > SampleDatabaseScheme < / system-name >
  < internal-cache-system >
  < local plan >
  < system-Ref > SampleMemoryScheme < / plan-ref >
  < / local plan >
  < / internal-cache-system >
  < dumps-plan >
  schema < class >
  > class name < com.tangosol.examples.coherence.DBCacheStore < / class name >
  < init-params >
  < init-param >
  java.lang.String < param-type > < / param-type >
  * < {cache name} param-value > < / param-value > *.
  < / init-param >
  < / init-params >
  < / class-system >
  < / dumps-plan >
  < / reading-writing-support-map-plan >
  
  
  Thank you very much
  
  Published by: jetq on June 24, 2009 18:26

  Hi Frank,.

  In the example, the '{cache-name}' is supposed to be replaced by a table name or view of data that is queried for the cached data. Its purpose is show how to pass parameters to the constructor of class.

  Kind regards

  Harv

• Why use the symbol "!" here?

  Why use the symbol "!" here?
  If (! contactOld.getWorkAddress) .equals)
  ...
  

  public void entryUpdated(MapEvent event)
  {
  Contact contactOld = (Contact)event.getOldValue();
  Contact contactNew = (Contact)event.getNewValue();
  StringBuffer sb = new StringBuffer();
  if (!contactOld.getHomeAddress().equals(
  contactNew.getHomeAddress()))
  {
  sb.append("Home address ");
  }
  if (!contactOld.getWorkAddress().equals(
  contactNew.getWorkAddress()))
  {
  sb.append("Work address ");
  }
  if (!contactOld.getTelephoneNumbers().equals(
  contactNew.getTelephoneNumbers()))
  {
  sb.append("Telephone ");
  }
  
  sb.append("was updated for ").append(event.getKey());
  System.out.println(sb);
  }

  The "!" reverse value.

• Why not use the static methods - example

  Hello world
  
  I would like to continue the below thread about "why not use static methods.
  Why not use the static methods
  with the concrete example.
  
  In my small application, I need to be able to send keystrokes. (java.awt.Robot class is used for this)
  I created the following class for these "operations" with static methods:
  

  public class KeyboardInput {
  
       private static Robot r;
       static {
            try {
                 r = new Robot();
            } catch (AWTException e) {
                 throw new RuntimeException(e + "Robot couldn't be initialized.");
            }
       }
       
       public static void wait(int millis){
            r.delay(millis);
       }
       
       public static void copy() {
            r.keyPress(KeyEvent.VK_CONTROL);
            r.keyPress(KeyEvent.VK_C);
            r.keyRelease(KeyEvent.VK_C);
            r.keyRelease(KeyEvent.VK_CONTROL);
       }
  
       public static void altTab() {
            r.keyPress(KeyEvent.VK_ALT);
            r.keyPress(KeyEvent.VK_TAB);
            r.keyRelease(KeyEvent.VK_TAB);
            r.keyRelease(KeyEvent.VK_ALT);
       }
  
                 // more methods like  paste(), tab(), shiftTab(), rightArrow()
  }

  You think it's a good solution? How could it be improved? I saw something Singleton vs somewhere of static methods. Wouldn't be better to use Singleton?
  
  Thanks for your comments in advance.
  lemonboston

  maheshguruswamy wrote:

  lemonboston wrote:

  maheshguruswamy wrote:
  I think a singleton might be a better approach for you. Just kill the public constructor, and provide a getInstance method to provide late initialization.

  Maheshguruswamy thanks for the tips on the steps create a singleton of this class.
  Perhaps you could say also why do you say that it would be preferable to use singleton? What is behind it? Thank you!

  In short, it seems to me that a single instance of your class will be able to coordinate actions across your entire application. If a singleton should be sufficient.

  But who doesn't answer why he expected prefer a singleton instead of a bunch of static methods. Functionally, the two are almost identical. In both cases, there is that a single 'thing' to call methods - either a single instance of the class or the class itself.

  To answer the question, the main reason to use a Singleton on a class of static methods is the same reason readers much of not static vs static decisions: polymorphism.

  If you use a Singleton (and and interface), you can do something like this:

  KeyboardInput kbi = get_some_instance_of_some_class_that_implements_KeyboardInput_somehow_maybe_from_a_factory();
  

  And then everything calling public methods of KBI has to know that there an implementor of this interface, without worrying about what concrete class is, and you can replace some implementation is appropriate in a given context. If you do not need to do, then the approach of the static method is probably enough.

  There are other reasons that may suggest a Singleton - serialization, persistence, use as a JavaBean pop to mind - but they are less frequent and less convincing in my experience.

  And finally, if this thing keeps updated a State between method calls, even if you can manage it with static member variables, it is more in line with the OO paradigm to make them non-static fields of an instance of this class.

• why I use the new cc photoshop cannot open, have and pdf

  why I use the new cc photoshop cannot open have and pdf.

  and more slow then former execution

  According to your records, you bought the CC for photography program under the same ID from Adobe Photoshop.

  It gives you access to use Photoshop & light room.

  Concerning

  Stéphane

• Why FF uses the IE temporary Internet files directory?

  I used Firefox exclusively as my browser for the last 6 months. Recently, I checked my "Temporary Internet Files" folder, where IE stores the pages visited and found complete and up-to-date, even if I had deleted everything that it when I started using FF. Why Firefox stores data here? Please note: on my computer, I have implemented the 'Temporary Internet Files' as folder hidden IE... IT IS NOT THE FF CACHE FOLDER. Thanks for any help.

  If you visit a Web site that uses MS plugins like Windows Media Player or Silverlight then these plugins will use the cache (temporary Internet files) Windows than IE also uses.

• why we use the network module

  Why use the network module? What is the purpose of it

  Hello

  When you buy a switch or router, it comes with some default interfaces and some empty slots.

  The default interfaces are usually ethernet interfaces; However, router or switch supports more types of interfaces. You can order and buy these interfaces according to your needs. New interfaces in the form of modules can be put inside these empty slots. Suppose you need a WAN connection between two places. If you buy a module WAN. It's like buying a card your computer's ethernet. Or you need to connect fiber optic cables to your router, you will need to purchase a module with a fiber interface.

  There are two types of module and also two different locations on the routers. Small slits are WIC and bigger for NM (network module)

  Module 1-network (your question).

  This is a great module which can contain a variaty of ports and also some NM modules and some WICs. These modules can usually be inserted into larger routers.

  2-

  WIC is smallest card that can be inserted into a router dirrectly or some cards NM.

  WIC and NM are a little old and today HWIC and NME are mainly used.

  Please click the link below to check the different types of module for router 2800. Take a look at modules with the prefix of NM, NME, WIC HWIC.

  http://www.Cisco.com/c/en/us/products/routers/2800-Series-integrated-SER...

  It will be useful,

  Masoud

• Why we use the Cisco Voice environment CUBE

  Hi all

  Hope you all are doing well.

  (1) can someone describer that's why we use CUBE in Cisco voice environment and this is the main purpose? Configure the steps?

  (2) what is allowed and what type of license that we use in the world of VOICE?

  (3) features and integration between the CUCM CUPS CUPS?

  Thank you

  Arjun keita

  This very open Q

  To read a bit of paper on the product

  http://www.Cisco.com/c/en/us/products/unified-communications/unified-BOR...

  and no further questions, see the Q & A

  https://supportforums.Cisco.com/document/69976/frequently-asked-question...

  BR
  Mamdouh

• By using the symbol as password

  is it possible to use a symbol drawn on the screen to act as a password to open the Surface?

  You can use the text password, password PIN or password photo. That's all.

• Why we use the cursor

  Hi all

  I would be grateful someone right me if I'm wrong. I ask the question below just for my purpose of learning.

  Question - Why do we use the cursor?

  Response Cursor is used to treat several lines in PL/SQL.

  Or

  Is used to treat a set of records from one or more tables, you can write a cursor on the table using select statement and then you can browse through all these a Recordset, and perform your required operations.

  Post edited by: Muzz, I'll open another discussion to my other question. Thank you

  Hello

  Muzz says:

  Hi all

  I would be grateful someone right me if I'm wrong. I ask the question below just for my purpose of learning.

  Question - When we use Procedure and Function when?

  Response

  When you want to run a series of DML statements then do like us and when we want to return a single value, then we use the function.

  Much has been written on this subject.  Start by finding some of them:

  https://www.Google.com/#q=when+use+procedure+function+Oracle

  read some of them and then ask a more specific question

  Procedures are not just for the DML; There are a lot of things in addition to DML you can do in the procedures.  For example, you can send e-mail messages, or can read and write files.

  The second half of your response, 'when we want to return a single value, then we use the function', is the right of bascally.  In particular, when you want to return a value that will be used in a SQL statement, you use a function.

  Functions in the pipeline are a special case.  A lot of what you read or you say about 'functions' means implicitly 'no Pipeline functions.

  Question - Why do we use the cursor?

  Response Cursor is used to treat several lines in PL/SQL.

  Or

  Is used to treat a set of records from one or more tables, you can write a cursor on the table using select statement and then you can browse through all these a Recordset, and perform your required operations.

  You'll have best results if you start a separate thread for each separate issue.  This issue is completely separate from the question on procedures

  You're right that the sliders are a way to process the rowsets, which can contain 1 line or several lines.

  Yes, you can use a slider to manage the rows one at a time.  Do not forget that it will be less effective than the manipulation of all at once, so don't use a cursor to do something that can be done in a single SQL statement.

• Using the KM configuration variable

  Hello
  
  I use LKM that uses the utility oracle sqlldr to load the data. I don't want to use the path hard-coded in the configuration of LKM.
  for example defalut directory = / root/home /.
  
  I defined a V_SQLDR_DIR variable to store the path. The value of the variable is not resolved during execution.
  
  Default directory = #V_SQLDR_DIR

  You must use a package, the first step of your package will be to define and initialize the variable, and then add your interface in the package.

• Why FF uses the '\n' in the textarea tag line endings, but when the data sent to the server it uses "\r\n" thin line?

  I type a text in a text box and using a jQuery expression:
  "$('textarea:first').val (.replace(/\r/g,_'R').replace) (/ \n/g, 'n')'"
  It shows that FF use the endings '\n' and once the form is submitted the endings of line "\n" is replaced by "\r\n" fine line

  The problem is length of incorrect text for the text of the line multi - on the browser side, it is less due to '\n' line thin and server side, it is more long term "\r\n" purposes of line and triggers a certain inconsistency to the validation of a length text between browser and server.

  Hi vparamon,
  I do not mean that it is a statement is beyond the scope of this forum, because I know, you can file a bug with troubleshooting information and steps to reproduce this with an example. However, I also know that it must be reproducible. Is this unique to your server? If this isn't the case, please fill out a bug in http://bugzilla.mozilla.org with an example to make it easy to reproduce.

• How to use the 'Get Shared Variable list' VI on a target RT?

  Hello

  I would like to browse all variables shared in a library hosted on my CompactRIO programmatically. I dropped the 'Get Shared Variable list' VI in my VI in real time, but when I tried deploying, LabVIEW says

  Deployment PRC_GetVarList.viPRC_GetVarList.vi loaded with errors on the target and was closed.
  LabVIEW: Unable to load the shared library dscProc.dll:ni_lvdsc_process_GetTagListEnd:C. ensure that the library is present on the target of RT. MAX allows you to install software from OR or FTP to transfer custom RT target libraries.
  LabVIEW: Unable to load the shared library dscProc.dll:ni_lvdsc_process_GetTagListBegin:C. ensure that the library is present on the target of RT. MAX allows you to install software from OR or FTP to transfer custom RT target libraries.

  I watched the wizard of the MAX software, but cannot find the DSC-based modules. Where should I look?

  Thank you!

  Hello

  The palette of DSC is not supported on the screws in real-time and will lead to errors when they are deployed.  Unfortunately, to have a successful build you will need to modify your application and remove the screws from the palette of DSC on your target of RT.

• Why PE10 uses the incorrect date format when it creates the files during import?

  Hey,.

  Since I upgraded to 10 EP, I had a problem with the date when the import format.  I have always used the format yyyy-mm-dd when I import my pictures, and this is the format that I choose when I import using Organizer, but it invariably creates files in the format yyyy-mm-dd.  It becomes tedious to rename folders.  Any advice?

  Thank you!

  Hello

  Try the appropriate fix

  Mac: http://kb2.adobe.com/cps/930/cpsid_93...

  Win: http://kb2.adobe.com/cps/930/cpsid_93...

  Brian

• use the stored procedure VARIABLE in an ODI procedure

  Hello
  
  I have a stored procedure that takes custId as an input parameter and returns the age as output parameter.
  
  custId is a varaible ODI that we spend during execution.
  
  I want to insert the age value in a table.
  
  declare
  cust_age customer_details.age%type;
  Start
  FETCH_CUSTOMER_DATA(#Customer.CustomerID,cust_age);
  end;
  
  INSERT INTO CUSTOMER_AGE VALUES(#customerid,*cust_age*)
  
  Thank you.

  Hello

  Just use the insert in an ODI procedure in an anonymous pl/sql block.

  I mean:

  declare

  cust_age customer_details.age%type;

  Start

  FETCH_CUSTOMER_DATA(#Customer.CustomerID,cust_age);

  INSERT INTO CUSTOMER_AGE VALUES(#customerid,*cust_age*);

  end;

  Ok?

  Cezar Santos
  http://odiexperts.com