Create a static method that verifies things without if statements

Similar Questions

• It is beneficial to create new static methods to replace lambda expressions?

  Simon told us to replace the lambda expression by method handles. Is there an advantage to do so, such as better performance? And it means that it is always advantageous to create new static methods instead of write lambda expressions?

  What Simon says - or should have said - is to use a reference method, is not a handle method. (A method handle is a construction of low level used by the invokedynamic bytecode and as such is much closer to the JVM. "It is not a feature of the Java language).

  In all cases, it can often be a good idea to use a method instead of an explicit lambda expression reference. Performance is not a problem. I did a comparative analysis and I was unable to discern the difference.

  First of all, you may already have a method that does what you want, so if you need a lambda that does the same thing, just write a method reference in the existing method.

  But sometimes it makes sense to take a lambda expression and then replace the lambda with a method reference refactor in a named method. There are several reasons for this:

  • Testability. A named method is easier to unit test to a lambda expression incorporated in a more complex construction as a data flow pipeline.
  • Reuse. The same logic can be used in several places, by calls direct or other references of the method.
  • Readability. If a lambda begins to be too big (in particular, several lines), it can disrupt the readability of a data flow pipeline.
  • Debugging. While most debuggers can today point stop and step by step through lambda expressions, control flow can be confusing.

  It is above all a question of degree. I find that about 95% of the lambda expressions that I write, or calculate something trivial, for example

  x -> x + 1
  

  or call a method in a way that cannot be expressed using a method reference, for example

  (a, b) -> a.foo(b.getBar())
  

  Rarely, I'll write an inline lambda, such as multi-instructions

  x -> { foo(x); bar(x); }
  

  Anything more complicated I'll tend to refactor in a separate method and use a method reference.

  Finally, a method reference can often be an instance instead of a static method method. If you're in an instance method and you want to write a reference to a method that is called on the same instance, you can write

  this::someMethod
  

  refer to it.

• Create a static button that does not move when you slide on several pages.

  Is it possible to do? I have a button that directs the user to the top of the document, but it is position moves when you drag on several pages. Is it possible to create something that is entirely static which remains in the same position?

  Thank you

  It's not a way to do this in DPS. All the elements are linked to the page.

  Neil

• How to create a generic method that calls the Web Service

  Hi I have a question how to create the Web Service client. In design mode, I can't specify static URLs? WSDL and process.
  
  I found the briliant method in library of apache cxf.
  
  for example
  
  DCF JaxWsDynamicClientFactory = JaxWsDynamicClientFactory.newInstance ();
  Customer customer = dcf.createClient ("http://soabpm-vm:8001 / soa-infra/services/default/MailSender/mailsender_client_ep?") WSDL");
  
  Object [] results;
  try {}
  Results = clientA.invoke (QName new ("http://xmlns.oracle.com/SynchDSBpel20/MailSender/MailSender", "process"), '@', 'body', 'subject');
  } catch (Exception e) {}
  
  
  In my case, I should create a method with params (URL? WSDL, URI, name of operation, param1, praram2, param3)
  
  
  Y at - it something like CXF in the ADF library?

  If your question has been answered, can you please mark as answer?
  THX
  Antonis

• extending class that contains static methods

  Hallo,
  is there a way to extend the static methods?
  
  I think that the small example can better explain what I need.
  

  public class StaticClass {
  
       public static void main(String[] args) {
            A a1 = new A1();
            A a2 = new A2();
            System.out.println("a1.f()=" + a1.f() + ", it would be 1");
            System.out.println("a1.foo()=" + a1.foo() + ", it would be 1");          // warning: The static method foo() from the type A should be accessed in a static way
            System.out.println("a2.f()=" + a2.f() + ", it would be 2");
            System.out.println("a2.foo()=" + a2.foo() + ", it would be 1");          // warning: The static method foo() from the type A should be accessed in a static way
            System.out.println("A1.foo()=" + A1.foo() + ", it would be 1");
            System.out.println("A2.foo()=" + A2.foo() + ", it would be 2");
       }
  }
  
  abstract class A {
       public static int foo() { return 0; }
       public int f() { return foo(); }
  }
  
  class A1 extends A {
       public static int foo() { return 1; }
  //     public int f() { return foo(); }
  }
  
  class A2 extends A {
       public static int foo() { return 2; }
  //     public int f() { return foo(); }
  }

  The line commented out in A1 and A2 are because I don't want to duplicate a same code
  
  Thanks a lot for any suggestion,.
  
  Carlo
  
  Published by: 918374 on 14-giu-2012 8.47

  You must present a new class/interface that describes the InputOut so you can use it without an instance of IO (and can delegate the normal methods of).

  interface IODescriptor {
    String getName();
    String getDescription();
    InputOutput createIO();
  }
  
  public abstract class AbstractIODescriptor implements IODescriptor {
    // save name, prefix and implements getDescription() with translator
  }
  
  public abstract class InputOutput {
    public InputOutput(IODescriptor descriptor) {
    // etc
  }
  

• ADF Faces: RicheTableau - how to create a richeTableau method of bean datacontrol object that returns a list of objects

  Build JDEVADF_12.1.2.0.0_GENERIC_130608.2330.6668

  I have a data bean control method that returns a list of SearchResultRow objects. Each SearchResultRow has a list of SearchResultColumn objects. SearchResultColumn is the attribute name, value, type of data.

  The method returned data looks like:

  SearchResultRow {col1, a1, string}, {col2, a2, date}, {col4, 13, number}, {col4, a4, string}

  SearchResultRow {col1, b1, string}, {col2, b2, date}, {col4, 23, number}, {col4, b4, string}

  SearchResultRow {col1, c1, string}, {col2, c2, date}, {col4, 33, number}, {col4, c4, string}

  I try to display searchResult table depending on whether it

  col1 col2 col3 col4

  A1 a2 a4 13

  B1 b2 b4 23

  C1 c2 c4 33

  I drag my return value of method to the jsf page to create a link to the tree.

  < Tree IterBinding = "retrieveSearchResultsIterator" id = "SearchResultRow" >

  < nodeDefinition DefName = 'model. SearchResultRow"name ="SearchResultRow0">

  < AttrNames >

  < item Value = "resultType" / >

  < / AttrNames >

  < accessors >

  < item Value = "searchResultColumns" / >

  < / accessors >

  < / nodeDefinition >

  < nodeDefinition DefName = 'model. ResultColumn"name ="SearchResultRow1">

  < AttrNames >

  < item Value = "name" / >

  < item Value = 'length' / >

  < item Value = "query" / >

  < item Value = 'type' / >

  < item Value = 'value' / >

  < / AttrNames >

  < / nodeDefinition >

  < / tree >

  On my jsf page, I added a table then reused the liaison of the tree.

  < af:table value = "#{bindings." SearchResultRow.collectionModel width}"= '100% '.

  var = "row" rowBandingInterval = "0" id = "t3" binding = "#{backingBeanScope.backing_Test4.t3}" partialTriggers ="": b1 ' columnStretching 'last' = > "

  My thought is in backing bean, loop through the table variable "line" which is my SearchResultRow and then loop SearchResultColumns of the line to build the RichColumn and add it to the table.

  My question is: is this feasible? How can I get hold of the var 'line' backing bean?

  Any other suggestions how to proceed?

  Thank you.

  I thought about it the adf table creation dynamically.

  This link is useful. ORACLE ADF (Application Development Framework): creating dynamic table

• I am very new to dream. I created a simple site that worked very well. I tried SEO booster and was checking on things different (for example Goigle webmaster). I don't know exactly what I did, but now when I type in my site it says the Palestinian Authori

  I am very new to dream. I created a simple site that worked very well. I tried SEO booster and was checking on things different (for example Goigle webmaster). I don't know exactly what I did, but now when I type in my site it tells me that the page cannot be opened because it was redirected too many times...? Help, please!

  Let me add some details to the choice in the scenarios you have for the use of domains.

  The areas are to simplify all kinds of activities on the Internet for users. Instead of addressing your email to go to the software from e-mail server to a computer with the IP 113.78.59.238 number, users can simply run their mail to "hannah" @ "gmail.com" or go to the website to "gildedgraces.com". This makes things a lot easier for users, but requires a little more difficult techniques backstage, because Internet computers connected and hardware (servers, tablets, phones, refrigerators) have only single numbers, not names. So, how internet needs to know which computer manages all emails for "@gildedgraces.com", and where physically this site 'www.gildedgraces.com '? This is where the "Domain Name Servers" kick in. They maintain long lists of these domain names, with references to the IP numbers correct and up-to-date. In this way, technicians can also easily Exchange computers, servers, connections, where a site is moved to another host, or when a server suddenly collapses. These things will happen, things have to change. They want to update certain IP numbers in the list on the DNS servers. I have it?

  So in order to get a Web site running, you know where your domain registry database is guarded and kept safe, and where your Web site is physically located.

  Note the difference between DNS (or servers) and the service (or Web servers) throughout all the instructions and documentation.

  Now, have a look at this PDF that was returned by Brad, in his response above.

  The domain name can be registered at any domain provider and the registry itself is not always need to reside there. You could relegate (you might say "move" or move) the registry for the DNS to another provider (like BC) service. In such a scenario, he must tell the provider holding the credentials of your registry, to redelegate it in British Colombia. That's what the article 4 in the PDF file. And of course, BC DNS service can internally so all applications for this field to their own web server.

  You can also choose to keep your current domain provider maintains the registry, but that their DNS servers before any request of this area on the web servers of British Colombia, where your site is published. This is typically a necessity for registrations from non-American, since many extensions of national domains (such as .nl and .de) can be recorded by suppliers outside of this nation. So the registry simply cannot be moved to an American company (it's a legal thing). In such a situation, article 6 of the PDF comes into play, describing what BC would normally internally: to the domains of the physical location of the Web site.

• 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.

• How can I use objects in a static method

  Hello everyone, I have a problem, I need to show objects such as labelfield in a screen, and there is no problem, but, when I call a static method (due to the process that are made) I call a static method, I use a screen like this:

  static display;

  And when I print I use screen.add (object);

  But in the screeen nothing happens, please, can you help me?

  OK, if you use a static method ot locate your screen, so that you can reference your screen from the Thread.

  This is not, in my opinion, a good way to do what you're trying to do.

  As an alternative, pass a reference to your screen to your feed.  Say your current Thread it looks like:

  SerializableAttribute public class MyTherad extends Thread {}

  Variables of your Thread

  public MyTherad() {}

  your constructor for Thread stuff

  }

  public void run() {}

  What is your wire actuallly

  MyScreen.update (...); To update your screen

  }

  }

  and start you by doing this:

  AThread MyThread = new MyThread();

  aThread.start ();

  You can change it to something like:

  SerializableAttribute public class MyTherad extends Thread {}

  Variables of your Thread

  MyScreen myscreen = null;

  public MyTherad (MyScreen myscreen) {}

  your constructor for Thread stuff

  this.myScreen = myScreen;

  }

  public void run() {}

  What is your wire actuallly

  myScreen.update (...); To update your screen

  }

  }

  and start you doing this in your MyScreen:

  AThread MyThread = new MyThread (this);

  aThread.start ();

  Now you Thread has a revference on the screen, it will update and can update the non-static version.  This will do a lot of things much easier.

  I hope this helps.

  Edit:

  I see that I was in change when arkadyz posted what is pretty much exactly the same solution!

• Why not use the static methods

  Hello world
  
  I was informed in a previous thread to avoid using static methods it was possible.
  Why is it, could someone please tell me a little more about this? Are there best practices, concepts on this?
  
  Thanks in advance,
  lemonboston

  Hi Lemonbottom,

  The rule I used generally goes like this:

  If the method does something that I can use without the object containing it instantiate, then it can be made public static.

  In the previous examples, I had various foods. Apple might have a method called "getCaloricContent" that returns the number of calories in an Apple. I don't need an actual Apple to get this information, so I do static. However, if I want to Breathe() an Apple, then I need to build an Apple to do this, so static would not be appropriate.

  It is a loose guidance to help you get started. Try to avoid as much as possible of static methods. They add an extra dimension (often unwanted) to unit tests. It's not so say it is not a proper use of static methods.

  Once you've got your head around this concept, consider the model Singleton, who, in most cases, eliminates the need for static methods of learning.

  Kind regards
  Robb Salzmann

• How the static methods are mocked in any mocking framework JMockit?

  I've learned that we can mock static methods using Basic with PowerMock java library? Jmockit.Want to understand how it does in short in-house?
  
  I think I understand:-as we define the mock class in the test case itself (although there are different ways to create the mock class in each frame as using a syntax of waiting in Jmockit), these framework must define custom classes thru Chargers that they should be looking for this class definition in the unit test is. Its an assumption. Not sure if this is correct? But even if I'm right, preference of classloader hirerchy is boootstraploader then applicationclassloader than customerclassloader. So, how's that search for customerclassloader instead of applicationclassloader? is there a way that we can set the preference of the customer above on applicationclassloader class loader?

  You can tell your not custom class loaders to delegate to its parent.

  Or you can give the custom class loaders a different classpath from its parent and place classes to be loaded by the loader custom only on the way to his class, and on the parent.

• Calling static methods

  Hello
  I have a problem with calling the static methods after creating an object:
  I use coldfusion 7.0 and this is my code:
  When I use either < cfobject > or the same createObject
  
  < cfobject action = "crΘer" type = "java" class = "com.endeca.navigation.ENEQueryToolkit" name = "new_N" > "
  < cfset new_N = createObject ("java", "com.endeca.navigation.ENEQueryToolkit") >
  < cfdump var = "#new_N #" >
  < cfset new_N.selectRefinement = new_N (#my_nav_results #, toString (sample_refinement_value)) >
  
  1 CFDUMP tells me this object [unknown type] and [unable to convert to string]
  2. when I call a method static new_N.selectRefinement (...) I get "the selectRefinement of the chosen method was not found."
  3. the method of selectRefinement() arguments are correct data type
  
  Here are all of the methods of this class (all are static):
  public static boolean isImplicitRefinement (refinement of DimVal Sun, Dimension)
  public static DimValIdList removeDescriptor (DimVal descriptor n, Navigation)
  public static DimValIdList selectAncestor (n, DimVal, DimVal descriptor ancestor Navigation)
  public static DimValIdList selectRefinement (DimVal n, Navigation refinement)
  
  Any suggestions?
  Thank you

  After reading the http://www.bennadel.com/index.cfm?dax=blog:737.view and all the items, I found a solution to the problem: this is a code that works. First gives no results significant but second after the static method call returns the correct value. The problem was with the second parameter for the #sample_refinement_value # toSring (sample_refinement_value), which caused the error, I had:
  Thank you all for the comments and suggestions.
  
  
  
  

• Public static method &amp; amp; Asynchronous Web service... Save me

  Some ninjas need asynchronous to help me fill in the way that it works in Flex...
  
  Let's say we have an actionscript class called 'student '. I try to include a static method called findById(id:int) back student type. In theory, which allows me to create a new student by searching for the specific student by, say, a Web Services call...
  
  var newStudent:Student;
  newStudent = Student.findById (920);
  
  Now, the whole plan falls apart at the point where it's time to make the WebService call. For the life of me I can't figure out how to get the result of the Web service call to the return value of the findById() method. I've added the different listeners and created functions for them, but how to get the object resulting in, say, webserviceHandler() method in findById() to return?
  
  I'm quite sure I'm just a jerk Asynch stuff. Great programming karma awaits the person who can make me a little less stupid.
  
  -Steve
  Text

  You can change your Student.findById function to take two parameters: an entire ID and a callback function. The callback function must accept a ResultEvent parameter and you get your student.

• Compaq Presario CQ60 - 120ES: I tried the method that I said but is not working, black screen completely.

  Hello

  The method that I explain a message before did not. I tried with a boteable cdrom and usb

  but they didn't work as I thought or there may be errors with the steps that I followed.

  I'm confused, because it's a new situation for me, he never had a similar situation before.

  Please, if you know the solution, or if you know that this kind of problem have no solution only by software,

  write me about it.

  While I will continue to search for.

  Thank you very much and best wishes.

  Hi @f4t4pmKbZ,
  
  Please become a member of the HP's Support Forums. I understand that you have a problem with starting the computer. I would like to help you to solve this problem today.

  If you have al the troubleshooting of the message passed, the next step will be the call HP to set up the repair.

  If still have a warranty, please use the following http://www.hp.com/contacthp and create a folder for your question and contact HP. If you do not live in the United States / Canada, please click on the link below to get contact information for your region.
  http://WWW8.HP.com/us/en/contact-HP/WW-phone-assist.html

• I created a DVD of a video cassette (without using the PC). I would now like to make a copy of this DVD (DVD - RW) on the PC. How can I make a copy of the DVD?

  How to make a copy of a DVD (-RW) by using Windows Media or any program using PC?

  First... just a suggestion... using a slow burn speed
  produces a more reliable copy.

  If you have software installed Nero should have
  an option for copying DVDs.

  Also, the following method can be your answer...

  The following freeware can create an ISO Image
  that allows to burn copies. Once you have the
  image created... you can use it to burn as many copies
  as you need.

  FWIW... it's always a good idea to create a system
  Restore point before installing software or updates)

  Download ImgBurn:
  http://www.Digital-Digest.com/software/download.php?sid=470&SSID=0&did=1
  (The download is: SetupImgBurn_2.5.5.0.exe)

  (During the installation there will be an option to install
  Shortcuts of UniBlue and the "Ask Toolbar"... you can
  you want to deselect those)

  The following tutorials may be worth a visit:

  How to create an image file of a disc with ImgBurn
  http://Forum.ImgBurn.com/index.php?showtopic=6379

  How to write an image file to a disc with ImgBurn
  http://Forum.ImgBurn.com/index.php?showtopic=61