Question about Queue, what is the difference of add() and offer()?

Not all Queue contain add() method, but when it existing, is it just same?

All Queues contain both add and offer, because Queue inherits from Collection, which has add, and Queue itself specifies offer.
If you read the docs, you'll see that if add fails to add the item for any reason other than that it's already there, it must throw an exception, but offer can simply return false if it didn't add for any reason--such as the queue is full.

Similar Messages

  • What's the Difference Between OLAP and OLTP?

    HI,
    What's the difference between OLAP and OLTP ? and which one is Best?
    -Arun.M.D

    Hi,
       The big difference when designing for OLAP versus OLTP is rooted in the basics of how the tables are going to be used. I'll discuss OLTP versus OLAP in context to the design of dimensional data warehouses. However, keep in mind there are more architectural components that make up a mature, best practices data warehouse than just the dimensional data warehouse.
    Corporate Information Factory, 2nd Edition by W. H. Inmon, Claudia Imhoff, Ryan Sousa
    Building the Data Warehouse, 2nd Edition by W. H. Inmon
    With OLTP, the tables are designed to facilitate fast inserting, updating and deleting rows of information with each logical unit of work. The database design is highly normalized. Usually and at least to 3NF. Each logical unit of work in an online application will have a relatively small scope with regard to the number of tables that are referenced and/or updated. Also the online application itself handles the majority of the work for joining data to facilitate the screen functions. This means the user doesn't have to worry about traversing across large data relationship paths. A heavy dose of lookup/reference tables and much focus on referential integrity between foreign keys. The physical design of the database needs to take into considerations the need for inserting rows when deciding on physical space settings. A good book for getting a solid base understanding of modeling for OLTP is The Data Modeling Handbook: A Best-Practice Approach to Building Quality Data Models by Michael C. Reingruber, William W. Gregory.
    Example: Let's say we have a purchase oder management system. We need to be able to take orders for our customers, and we need to be able to sell many items on each order. We need to capture the store that sold the item, the customer that bought the item (and where we need to ship things and where to bill) and we need to make sure that we pull from the valid store_items to get the correct item number, description and price. Our OLTP data model will contain a CUSTOMER_MASTER, A CUSTOMER_ADDRESS_MASTER, A STORE_MASTER, AN ITEM_MASTER, AN ITEM_PRICE_MASTER, A PURCHASE_ORDER_MASTER AND A PURCHASE_ORDER_LINE_ITEM table. Then we might have a series of M:M relationships for example. An ITEM might have a different price for specific time periods for specific stores.
    With OLAP, the tables are designed to facilitate easy access to information. Today's OLAP tools make the job of developing a query very easy. However, you still want to minimize the extensiveness of the relational model in an OLAP application. Users don't have the wills and means to learn how to work through a complex maze of table relationships. So you'll design your tables with a high degree of denormalization. The most prevalent design scheme for OLAP is the Star-Schema, popularized by Ralph Kimball. The star schema has a FACT table that contains the elements of data that are used arithmatically (counting, summing, averaging, etc.) The FACT Table is surrounded by lookup tables called Dimensions. Each Dimension table provides a reference to those things that you want to analyze by. A good book to understand how to design OLAP solutions is The Data Warehouse Toolkit: Practical Techniques for Building Dimensional Data Warehouses by Ralph Kimball.
    Example: let's say we want to see some key measures about purchases. We want to know how many items and the sales amount that are purchased by what kind of customer across which stores. The FACT table will contain a column for Qty-purchased and Purchase Amount. The DIMENSION tables will include the ITEM_DESC (contains the item_id & Description), the CUSTOMER_TYPE, the STORE (Store_id & store name), and TIME (contains calendar information such as the date, the month_end_date, quarter_end_date, day_of_week, etc).
      Database Fundamentals > Data Warehousing and Business Intelligence with Mike Lampa
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  • What is the use of AET? What are the differences between AET and EEWB?

    Hi,
    I would like to know about AET? What is the use of AET? What are the differences between AET and EEWB? Please help me out?
    Thanks,
    Satish

    Hi
    You can refer the following links for your question.
    Difference between AET and EEWB
    What is the use of AET? What are the differences between AET and EEWB?
    Difference between EEWB - UI Configuration Tool - AET
    http://senthilsapcrm.wordpress.com/2010/02/04/adding-custom-fields-in-sap-crm-7-0-using-aet/
    What is the main difference between eewb and aet tool ?
    Hope it is useful.
    Thanks and regards
    Preeti Viswanath

  • What is the difference between ojvm and client versions?

    Changing the java vm from client to ojvm result in the following error:
    Errormessage:
    java.lang.UnsatisfiedLinkError: no UniqueC in java.library.path
    Project Settings -> Configurations -> Development -> Runner -> Virtual Machine -> ojvm FAILS
    Project Settings -> Configurations -> Development -> Runner -> Virtual Machine -> ojvm      RUNS OK.
    Project Settings -> Configurations -> Development ->Paths ->Additional Classpath:
    C:\jars\xerces.jar;C:\jars\UniqueC.dll;C:\jars\log4j-1.2.8.jar
    What is the difference between ojvm and client versions? How can I make ojvm to find UniqueC.dll?
    Various version info:
    Output from program:
    java version:1.4.2_01
    java home:C:\programfiler\JAVA\2sdk1.4.2_01\jre
    java vm version:9.0.3.738 cdov
    Taken from JDeveloper Help About:
    Oracle IDE     9.0.3.10.35
    UML Modelers Version     9.0.3.9.4
    Business Components Version     9.0.3.10.7
    java.version     1.3.1_02
    java.vm.name     OJVM Client VM
    java.vm.version     9.0.3.738 o

    However, Adobe offers extra paid services to create PDF or to export PDF to other formats. You are not required to buy them, however.

  • What is the difference between upgradation and migration.

    Hi Guru's
    what is the difference between upgradation and migration.
    actuallly i involved in upgradation project, here my role is
    1. first i check the query's in 3.5 save the query and transport the query. and check the query in bex analyzer also.
    2. go to BI .7  find the query;s ,give the query name and save the query ,
    3. once save the query, again will come to 3.5 open the query , it will not open. this is my job here,
        come to 7.0 check the query in analyzer also.
    i am having littile bit confusion, how it will comes query in 7.0, why are u saving the query's in 3.5 and 7.0
    query's already available in 7.0 why are u doing this work?
    can i know the upgrades those  objects, is it neccessary, if necessary how can i upgrade.
    infoobje , transferrules, transferstructure ,infosoure, datasoure,updaterules, ods, cubes.
    Points will be Assingned ,
    Thanks & Regards
    prabhavathi

    Hi,
    I was talking in a general sense not on a query level.
    If your taling about migration in that level meaning as a part of larger upgradation (in your case 3.x to 7) there may be many places where you need to do this kind of activities.
    Fr eg migration into new data flow, Migration of Web templates from BW 3.x to Netweaver 2004s, etc
    Hope this helps.
    Thanks,
    JituK

  • What is the difference between count(*) and count(1)

    what is the difference between count(*) and count(1)

    Hi,
    903830 wrote:
    some say count(1) is faster and some say count(*), i am confused about count function?In the link provided by Prakash :
    prakash wrote:
    http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:1156159920245
    You can read :
    Followup   August 31, 2001 :
    I'll have to guess, since you don't say, that you are using 7.x and before when count(*) and count(1) were different (and count(1) was slower). In all releases of the databases for the last 4-5 years, they are the same.
    Don't waste your time on that.
    ;-)

  • What's the difference between 45Wh and 54Wh battery?

    Hi,
    I was looking for a new battery for my MacBook Aluminum Unibody (Late 2008) and found that there are 45Wh and 54Wh battery. So what's the difference between 45Wh and 54Wh one at the same capacity? Will the 54Wh one offer a longer usage-time?
    Thanks,
    Nathan

    aznjia wrote:
    I wouldn't trust it. Even though the new battery is rated at 54 Watt hour but an apple battery may or may not run up to 1000 cycles. I looked the product reviews on amazon and I will go for what others said. However, Apple battery is designated to last about 700-1000 charge cycles but a battery over than 700 cycles. I am apple battery tech savvy. I would like to share my experience and provide sufficient answers to all the people in this forum.
    I have no idea what you are trying to say. But I am NOT buying or recommending any 3rd party battery. Please read the post.

  • What's the difference between CoBuilder and other developmen​t tools?

    Is there any more excellent features about CoBuilder?
    or What's the difference between CoBuilder and other development tools?
    I just want to know more about it.
    Thanks!

    One more thing, if you do not have the hard drive icon on the desktop you can get it there by:
    click on the desktop so the menu bar says Finder next to the apple logo, click Finder, then Preferences, General, Show These Items on desktop and check the hard disks:
    That makes life a lot easier when you want to find out information.
    Ralph

  • What's the difference between "overloading" and "overriding" in Java

    What's the difference between "overloading" and "overriding" in Java

    hashdata wrote:
    What is the real-time usage of these concepts...?Overriding is used when two classes react differently to the same method call. A good example is toString(). For Object it just returns the class name and the identityHashCode, for String it returns the String itself and for a List it (usually) returns a String representation of the content of the list.
    Overloading is used when similar functionality is provided for different arguments. A good example is [Arrays.sort()|http://java.sun.com/javase/6/docs/api/java/util/Arrays.html#sort(byte%5B%5D)]: all the sort() methods do the same thing (they sort arrays), but one sorts byte-arrays, another one sorts int-arrays, yet another one sorts Object-arrays.
    By the way, you almost certainly mean "real-world" usage. "real-time" (and thus "real-time usage) means something entirely unrelated to your question.

  • What is the difference between  ABAP and HR-ABAP?

    Hi people,
    Could u just tel me abt what is the difference between ABAP and HR-ABAP?
    Thanks in advance,
    Sanjeev K.V

    Hi Sir ,
    Please have a look below .Hope it is suitable and simpler solution for your question.
    Please do reward if useful.
    Thankx.
    HR deals with the INFOTYPES which are similar to Tables in General ABAP.
    There are different ways of fetching data from these infotypes.
    There are different areas in HR LIKE Personal Admn, Orgn Management, Benefits, Time amangement, Event Management, Payroll etc
    Infotypes for these areas are different from one another area.
    storing of records data in each type of area is different
    LDBS like PNP are used in HR programing.
    Instead of Select.. we use some ROUTINES and PROVIDE..ENDPROVIDE.. etc
    and in the case of Pay roll we use Clusters and we Import and Export them for data fetching.
    On the whole Normal ABAP is different from HR abap.
    Also,
    HR:
    HR deals with the INFOTYPES which are similar to Tables in General ABAP.
    There are different ways of fetching data from these infotypes.
    There are different areas in HR LIKE Personal Admn, Orgn Management, Benefits, Time amangement, Event Management, Payroll etc
    Infotypes for these areas are different from one another area.
    storing of records data in each type of area is different
    LDBS like PNP are used in HR programing.
    Instead of Select.. we use some ROUTINES and PROVIDE..ENDPROVIDE.. etc
    and in the case of Pay roll we use Clusters and we Import and Export them for data fetching.
    On the whole Normal ABAP is different from HR abap.
    For Personal Admn the Infotypes start with PA0000 to PA1999
    Time Related Infotypes start with PA2000 to PA2999.
    Orgn related Infotypes start with HRP1000 to HRP1999.
    All custom developed infotypes stsrat with PA9000 onwards.
    In payroll processing we use Clusters like PCL1,2,3 and 4.
    Instead of Select query we use PROVIDE and ENDPROVIDE..
    You have to assign a Logical Database in the attributes PNP.
    Go through the SAp doc for HR programming and start doing.
    http://www.sapdevelopment.co.uk/hr/hrhome.htm
    See:
    http://help.sap.com/saphelp_46c/helpdata/en/4f/d5268a575e11d189270000e8322f96/content.htm
    sites regarding hr-abap:
    http://www.sapdevelopment.co.uk/hr/hrhome.htm
    http://help.sap.com/printdocu/core/Print46c/en/data/pdf/PAPA/PAPA.pdf
    http://help.sap.com/printdocu/core/Print46c/en/data/pdf/PAPD/PAPD.pdf
    http://help.sap.com/printdocu/core/Print46c/en/data/pdf/PYINT/PYINT_BASICS.pdf
    http://www.atomhr.com/training/Technical_Topics_in_HR.htm
    http://www.planetsap.com/hr_abap_main_page.htm
    You can see some Standard Program examples in this one ...
    http://www.sapdevelopment.co.uk/programs/programshr.htm
    http://searchsap.techtarget.com/originalContent/0,289142,sid21_gci1030179,00.html?Offer=SAlgwn12604#Certification
    http://www.erpgenie.com/faq/hr.htm.
    http://www.planetsap.com/hr_abap_main_page.htm
    http://www.sapbrain.com/TUTORIALS/FUNCTIONAL/HR_tutorial.html
    These are the FAQ's that might helps you as well.
    http://www.sap-img.com/human/hr-faq.htm
    http://www.sapgenie.com/faq/hr.htm
    http://www.planetsap.com/hr_abap_main_page.htm
    http://www.atomhr.com/library_full.htm
    HR Long texts Upload
    Look at the below link
    And finally,
    Few notes are below:
    InfoSets in the HR Application
    You can use SAP Query in HR to report on HR data. Queries are maintained as described in Creating Queries. The special features of queries created for HR are described in Maintaining Queries in the Human Resources Application. The maintenance procedure for HR InfoSets differs from the described procedure inasmuch as HR data fields are grouped together in infotypes.
    InfoSet management in SAP Query is also used for InfoSet Query. For further information, see Functions for Managing InfoSets.
    If you want to create InfoSets for HR, you can use logical databases PNP, PNPCE, PAP, and PCH (see HR Logical Databases). The database you must use to create your InfoSet depends on the component in which the data you want to report on is stored.
    The reports you can execute using InfoSets based on logical databases PNP (or PNPCE) or PCH are similar, but differ in that they can select different objects. The following table describes the connection between the logical database, and the infotypes you can include in an InfoSet. It also provides you with one or two examples of reports that you can execute using the appropriate InfoSets.
    Logical database PNP/PNPCE* PCH PAP
    Selection of Persons Objects from Personnel Planning Applicants
    Infotypes that can be included in the InfoSet Infotypes for· Personnel Administration (0000-0999) · Time Management (2000-2999) · Payroll infotypes · Infotypes for Personnel Planning objects that can be related to persons If the object type is specified:· Infotypes for the object type · Infotypes for objects that can be related to the specified object typeIf the object type is not specified:· All infotypes · Infotypes for Recruitment (4000-4999)· Some infotypes for Personnel Administration (such as 0001 and 0002)
    · Customer infotypes
    Reporting examples · Selection of all persons who participated in a specific business event, output of prices for reserved business events · Selection of all persons assigned to a specific personnel area, output of qualifications held by these persons · Selection of all business events held in London in March, output of all persons who participated in these business events · Selection of all positions assigned to a specific organizational unit, output of all persons assigned to the positions · Selection of all applicants hired last year to work on special projects, output of addresses for the applicants selected
    Logical database PNPCE (PNP Concurrent Employment) functions just like logical database PNP. The procedure for creating InfoSets is also the same. It only becomes significant if you work with Concurrent Employment.
    Creating InfoSets
    The maintenance procedure for HR InfoSets differs from the procedure described so far in this section inasmuch as HR data fields are grouped together in infotypes. To set up an InfoSet for the HR application, proceed as follows:
    1. On the initial screen for maintaining InfoSets, enter a name for the InfoSet and choose Create.
    2. On the next screen, enter a name for the InfoSet and select one of the HR logical databases in accordance with your reporting requirements.
    Customer infotypes can be created on all HR logical databases. In each individual case, therefore, you must decide which database to select so that you can report on customer infotypes.
    This screen enables you to enter an authorization group. All of the queries that are subsequently created using this InfoSet can only be executed by persons who have this authorization group.
    3. Choose .
    This takes you to the Infotype Selection for InfoSet  screen. You now have the option of creating field groups and assigning fields as required for non-HR InfoSets. Field groups that correspond to infotypes and already contain fields, however, are always created for HR InfoSets. The field groups are displayed in an overview tree in the top right section of the screen.
    The infotypes that you included in the InfoSet are displayed in an overview tree on the left of the screen. The infotype fields that are already included in field groups are displayed in a different color, and the corresponding field group ID is displayed.
    In the standard system, a field group is created automatically for each infotype that you included in the InfoSet (a field group corresponds to an infotype).
    In the standard system, each field group contains the infotype-specific fields. To ensure that working with the InfoSet is as easy as possible, you are advised to restrict your use of fields in each field group to those you really require. This means you should remove fields that are not required.
    An infotype's fields must only be assigned to the pertinent field group. Make sure this assignment is correct. If the assignment is incorrect, the InfoSet could be rendered unusable.
    When an InfoSet is created, the following fields are transferred automatically to the first field group:
    § Logical database PNPCE or PNP Personnel number
    § Logical database PAP Applicant number
    § Logical database PCH Object ID, plan version, and object type
    6. Determine the fields that must be included in the field groups of your InfoSet. If you require further information, see Assigning Fields to a Field Group.
    If you want, you can change the default sequence of field groups and fields as required using Drag&Drop.
    7. To save the InfoSet, choose .
    8. To generate the InfoSet, choose .
    On the Change InfoSet (InfoSet name) screen, you can choose Edit ® Change infotype selection to add more infotypes to the InfoSet, or to remove infotypes from the InfoSet. Remember to regenerate the InfoSet afterwards.
    This screen also enables you to update InfoSets if, for example, the system contains new additional fields for specific key values. To do so, choose InfoSet ® Additional functions ® Update additional HR fields.
    9. Go back to the initial screen for InfoSet maintenance.
    10. Choose User group assignment.
    11. Select a user group, and save your entry.
    sample code
    START-OF-SELECTION.
    GET pernr.
    rp_provide_from_frst p0000 space pn-begda pn-endda.
    if pnp-sw-found EQ '1'.
    READ TABLE p0001 WITH KEY pernr = p0000-pernr.
    if sy-subrc = 0.
    write : p0001-plans. " earliest.
    endif.
    endif.
    rp_provide_from_last p0014 space pn-begda pn-endda.
    if pnp-sw-found EQ '1'.
    READ TABLE p0014 WITH KEY pernr = p0000-pernr.
    if sy-subrc = 0.
    write : p0014-LGART. .
    endif.
    endif.

  • Could any one tell me what is the difference between swfloader and module loader?

    Hi  All,
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    Hi,
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    the module that will keep it alive and un-GC'ed.
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    The main difference between modules and applications is that modules have lower overhead, and they only ever get loaded once, no matter how many times you load them. If you're using the ModuleLoader API, keep in mind that you're losing about half the functionality of the module system.  I will assume that you are, because otherwise it would be obvious where to expose methods.  You might want to play around with the lower level ModuleManager API just to get a hang of what's going on - ModuleLoader is a pretty thin veneer over the lower API.                
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  • What is the Differences between Caingorm2 and Parsley(Caingorm3) ? Very Urgent ...plz help me out..

    Hi all,
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    Hi
    You can refer the following links for your question.
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    What is the use of AET? What are the differences between AET and EEWB?
    Difference between EEWB - UI Configuration Tool - AET
    http://senthilsapcrm.wordpress.com/2010/02/04/adding-custom-fields-in-sap-crm-7-0-using-aet/
    What is the main difference between eewb and aet tool ?
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  • HT202574 what is the difference between Flash and Fusion Drives?

    what is the difference between Flash and Fusion Drives?

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  • What is the difference between add ons/boosters?

    what is the difference between add ons/boosters?

    Hi ,
    Welcome to the community. Thanks for joining.
    Great question here is the answer.
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    Add on information can be found on the EE help pages. (Page size to download 11.22kb)
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  • What is the difference between Campaign and Trade Promotion?

    hi experts,
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    regards,
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    Hi,
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    Trade Promotions are Marketing activity used by industries that sell into the retail channel or through brokers or wholesalers. A trade promotion takes place within a specific time period and aims to increase brand capital, brand awareness, and market share. It is also used to increase sales volume or to launch new products or product lines.
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