A map to keep track of classes and interfaces of all api's

Sorry because of my english, i hope someone can help me by telling me if there is a sort of map or schema in which graphically be deployed all api's clases in a uml style; i wish that resource exists and be able to be downloaded for free; if someone replies my answer thankyou very much.

smithdale87 wrote:
i dont think you will find a UML of all classes and API's.
The closest I can get you is http://java.sun.com/javase/6/docs/api/
Experiment with these links at the top of the page - Overview, Package, and Tree
Selecting Overview and Tree shows all of the class hierarchy.
Selecting Package and Tree shows it for that package.
This is close to what you want.

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Mapping data model to java classes and Interface.

Need help in mappning my data model into java classes;
Here are some of the details:
Table, Poll:
PollID int
PollName varchar
BusinessUnit varchar
DisplaySchemeID int // reference to DisplayScheme table.
Table, DisplayScheme
DisplaySchemeID
DisplaySchemeName
etc
Table, URL
UrlID
UrlName
UrlDesc
Table, PollURL
PollURLID
PollID
UrlID
PublishDate
etc
Table, Tag
TagID
TagName
PollID
So, a POLL is associate with a DisplayScheme.
A Poll can have many URLs and a URL can be associate with many Polls , mapped in the PollURL table.
and same is the situation with tags.
Essentially I want to learn how to do one to many mappning and many to many mapping.
Also to add, since I plan to use Ibatis for OR mapping.
So I should a Parameter call to map for creaint a Poll. And to create a poll the form submitted will have:
- PollName
- URLs ( multiple )
- one display scheme.
- Tags ( many )
So if you can show how to write a DAO createPoll method, then it would be great.
Not sure if am asking a lot, but this would be a great example to move forward.

The below is the sample DAO Class.
For your case, you have to create your own PollBean with getters and setters and just pass the object to the method
public int create(Connection con, ProjectBean projectBean) throws SQLException {
          int result = 0;
          String insertQuery = " INSERT INTO" +
                    " M_PROJECT(" +
                    " PROJECT_ID," +
                    " PROJECT_NAME," +
                    " PROJECT_DESCRIPTION) " +
                    " VALUES(?,?,?,?)";
          initPrepareStmt(con, insertQuery);
          setString(projectBean.getProjectID());
          setString(projectBean.getProjectName());
          if(projectBean.getProjectDescription().equals("")){
               setString(" ");
          }else{
               setString(projectBean.getProjectDescription());
          result = executeUpdate();
     return result;
     }

HT204023 My husband and I have different phone numbers for our business; however, we need a way to keep track of incoming and outgoing calls on both phones. By the end of the day, our phone has deleted several numbers. How can we locate those deleted nu

My husband and I have separate phone numbers for our business but need to keep track of incoming and outgoing calls; however, by end of day many numbers have been automatically erased from our phone. How can we find those deleted numbers?

I believe the total amount is 100 calls that will list.
No way of changing that.

My daughter and I both have iPhone 4s'. Last night she switched to ios7 and I am still using ios6. I use the find my iPhone app to keep track of her and since the update it no longer works. Her phone says its on. ???

My daughter and I both have iPhone 4s'. Last night she switched to ios7 and I am still using ios6. I use the find my iPhone app to keep track of her and since the update it no longer works. Her phone says its on but when I try and locate it from either my phone or laptop it shows it offline. Any suggestions. It's my only peace of mind! Thanks!

Does she have her own iCloud account? You can have more than one iCloud account installed on a device, and some users install a secondary iCloud account which is common to others in the family to allow "Find My iPhone" to be used from one account while keeping separate iCloud contacts, mail, etc.
But with iOS 7 although you can still have multiple iCloud accounts installed, only the "primary" iCloud account supports "Find my iPhone". So if her iCloud account is the primary, you can no longer track her from your iCloud account. Is that what happened in your case?

How to keep track of the users who are all currently logged in

Hi All,
I have basic knowledge of Session and Servlets. I am wondering how to keep track of the users who are all currently logged in. There should be some way of achieving it.
I thought of it and come up with having an Application variable that hold it when ever a user successfully logged in.
Thanks in advance for any reply.

You can do this by keeping data in a static veriable in a some class of yours. The variable will need to be a collection.
Whenever a user loogs in to the site a servlet/jsp should put the users information in to the collection and when logs off or when the session expires the entry should be take off.
You can achive this by storing the velues in a some sort of a week collection where the entries are automaticaly removed when all the other refferences to the entry goes out of scope.
You might need to read bit about java.lang.ref package and WeekReference
Or you can make the entry in the collection contain the last time that the user visited any of the pages and a thread can run time to time and clean up the older entries which have timed out

Question about Classes, Abstract Classes and Interfaces.

I have been experimenting with Classes, Abstract Classes and Interfaces and wonder if anyone can explain this to me.
I was looking for a way to assign a value to a variable and then keep it fixed for the session and have devised this.
First I create an abstract class like this:
public abstract class DatabaseConnection {
private static String ServerName = null;
public static void setServerName(String serverName) {
          ServerName = serverName;
     public static String getServerName() {
          return ServerName;
}and then I created an interface
public interface DatabaseAccess {
     String servername = DatabaseConnection.getServerName();
}And finally the class itself with some test lines in it so I could see what was going on:
public class CreateDatabase extends DatabaseConnection implements DatabaseAccess {
     public static void main (String args[]){
          new CreateDatabase();
     public CreateDatabase(){
          setServerName("Server Name 1");
          System.out.println ("Before update ");
          System.out.println ("ServerName from Interface           = " + servername);
          System.out.println ("ServerName from Abstract Class = " + getServerName());
          System.out.println ("After update ");
          setServerName("Server Name 2");
          System.out.println ("ServerName from Interface           = " + servername);
          System.out.println ("ServerName from Abstract Class = " + getServerName());
          System.out.println ("==========================");
}The output I get from the above is:
Before update
ServerName from Interface           = Server Name 1
ServerName from Abstract Class = Server Name 1
After update
ServerName from Interface           = Server Name 1
ServerName from Abstract Class = Server Name 2
==========================I also tried this in another class which calls the above class to see if I get the same effect
public class CheckDatabaseAccess {
     public static void main (String args[]){
          new CreateDatabase();
          CreateDatabase.setServerName("Server 3");
          System.out.println("CreateDatabase "+CreateDatabase.servername);
          CreateDatabase.setServerName("Server 4");
          System.out.println("CreateDatabase "+CreateDatabase.servername);
          CreateDatabase.setServerName("Server 5");
          System.out.println("CreateDatabase "+CreateDatabase.servername);
}The output of which is this:
Before update
ServerName from Interface           = Server Name 1
ServerName from Abstract Class = Server Name 1
After update
ServerName from Interface           = Server Name 1
ServerName from Abstract Class = Server Name 2
==========================
CreateDatabase Server Name 1
CreateDatabase Server Name 1
CreateDatabase Server Name 1Can anyone explain why I appear to only be able to change or set the ServerName only the once?
Is this the correct way to do it? If it is it's exactly what I am looking for, a way to set the value of variable once in a session and then prevent it being changed.
Or is there a better way of doing this.
What I want to use this for is for example, storing the accesses to a database on a server. I won't know what server the database will be stored on nor what the database is called so I create an INI file which stores this information in encrypted format, which is set by the database administrator. It occurs to me I can use this method to then retrieve that data once and once only from the INI file and use that throughout the life of the session to access the database.
Any help appreciated
Regards
John

Not gonna read all of it, but this jumps out:
public abstract class DatabaseConnection {
private static String ServerName = null;
public interface DatabaseAccess {
     String servername = DatabaseConnection.getServerName();
}You have two completely separate variables (with two different names, for that matter, since you were inconsistent in your capitalization, but it wouldn't make a difference if they did have the same name with the same case). And the one in the interface is implicitly public, static, and final.
Anytime you refer to "servername" through a reference of type DatabaseAccess, it refers to the one declared in the interface.
Anytime you refer to "ServerName" inside the DatabaseConnection class, it refers to the one declared in that class.

Compiling Nested Classes and Interfaces

I am looking for documentation about compiling nested classes and interfaces. I have found something in the JVM Specification, but there does not explain how a nested class is compiled and what is included in the top level class to mark a "place holder" to the nested class. The JVM Specification in this topic cite the web page http://java.sun.com/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc.html that does not exists any more.
My root problem is that: I am compiling a class with a private nested class, but in the class file generated TopLevelClass$NestedClass.class the class does not have the private modifier. So I am not understanding why the "private" modifier was removed during compilation.
I performed the same test with a protected nested class and the result was the nested class with the public modifier. So I am not understanding why the "protected" modifier was changed to "public".
Thanks in advance,
Mardoqueu.

This should not be happening. What compiler are you using? If it's a reasonably recent Sun compiler, could you post a minimal example?

Documentation for Oracle XML parser Classes and Interfaces

I would like to use the oracle XMLParser V2 classes with JDeveloper 3.1, but I cannot find any reference documentation for the classes and interfaces in help.
I am especially interested in a documentation for the XSLProcessor class. The only information I found was provided with the few provided samples.

I don't think the javadoc for this was included in the release. You can get the Javadoc (as well as the latest version of the XML Parser v2) here on OTN.
Take Care,
Rob
null

About Classes and Interfaces

How can we define the classes and interfaces in an interview can u give me any realtime example for this

How can we define the classes and interfaces in an
interviewThe easiest explanation probably is to say that an interface in Java is a special class, namely a totally abstract one, that has been given a separate name.
Classes and interfaces (because they're classes in disguise) both constitute types, meaning that variables can be declared of them. The difference is that a class can carry implementation whereas an interface cannot (because it's totally abstract).
Java has single inheritance of implementation which means the the inheritance of classes is restricted to exactly one while you can inherit as many interfaces you like.

What are the classes and interface in JDBC

Please anybody tell me
What are the Classes in JDBC?
and
What are the Interfaces in JDBC?
Will you please show the classes in one table and interfaces in one table. Plesae
regards
pooja.

Hi jeyan,
Very more thanks. I am searching lot of time in net to exactly get the classes and interface in jdbc. Now you have given helpful link.
thank you.
regards
pooja

What is the difference between Abstract class and Interface ?

Hi,
Could u plz tell me the difference between Abstract class and Interface?
Thanks in advance.
Gopi

Lots.
An abstract class can contain some method implementations, or indeed all the method implementations. It may contain methods with all the various access modifiers. It cannot be instantiated. A class may inherit from only a single abstract class.
An interface contains only public method stubs and constants. A class may implement multiple interfaces. An interface cannot (obviously) be instantiated.
Abstract classes are particularly useful when you need to provide a semi-complete implementation for reuse. Interfaces are used more like types.
Look at java.util.* for some good examples of the use of both.

Difference between Abstarct Class and Interface

HI,
Here is a simple one for the gurus but quite important for me.
What is the difference b/w an Interface and an abstract class?
Why do we need each one of them?
I would appreciate if you people can give examples of each so that I amy understand fully
Thanks in advance...

A normal class (not abstract) has a special behaviour, like java.awt.Frame. A Frame is a frame no matter how you subclass it. If you create a subclass it will still be able to be displayed by calling it's show method. So by using a normal class you can create a type of class.
An abstract class does the same, but it leaves some of the code unwritten. For instance java.lang.Number. This class is abstract becuase it has no knowledge of how to store the number in memory. But it knows that it is a number, and any subclass will still be a number. You could create a subclass of Number that can hold the time in milliseconds and checks your system clock to see what the time is, it could also have methods that return the time in another country, but it would still be just a Number.
An interface is a way to describe what an object can do, not what it is. So with java.lang.Comparable as an example you can make any class comparable. This means that no matter what type of object you have, it can be compared with other objects. So you can have a subclass of Frame that can be compared with other windows. Or a subclass of Number that can be compared with other Numbers. You can even compare those two different types if you like. So you could compare a window with a number.
That is the difference between abstract classes and interfaces.
I hope you could follow my arguments, it isn't an easy subject,
Daniel

Difference between abstract classes and interfaces

I actually wonder about what are the differences between abstract classes and interfaces may somebody give an example code about it?
and i have one more question how can i use interfaces like multiple inheritance ? i mean when i implement an interface like
class a extends b implements c,di have to use all c and d methods but what that methods means?
I mean as i know we cannot make implementations of methods in interfaces
but for example in runnable interface there is a method like run() and it has been defined somewhere because it knows what to do(i mean when it will run), i just write my code into that method .

Once you get past the starting point (I am referring to the OP here), there are a few salient differences:
You can only extend (or generalize) a single superclass; however, you can implement (or realize) multiple interfaces. As such, all things being equal, using an interface in lieu of an abstract class 'frees' your design. Later, if you want the implementor of an interface to inherit from another class, there is not issue.
Any abstract method specifies a contract. However, abstract classes allow you to also add common behavior to subclasses. This is an overused justification for abstract classes, IMO. You can achieve the same effect using delegation and still having interfaces.
Always program to interfaces wherever possible. This means that you define an interface and have an implementing class (usually at a minimum). Do not do this for all your classes, but rather the ones that make your system unique (the domain model or M in MVC architecture). This allows you to later change implementation with a minimal amount of refactoring. This is a core precept from the Group of Four and any number of decent programming books.Best of luck.
- Saish

Difference between abstact class and interface

hi
i am new in java.
plz tell me abstract class support which type of polymorphisam and
interface support which type of polymorphisam
plz explain
bye
siva

There's only one type of polymorphism.
Does that make it mono-polymorphism? ;)
Indeed - do a search for the forums.
The short answer is that both abstract classes and interfaces define required method signatures for subclasses that extend/implement them, but abstract classes can have implementation for some or all methods that are not abstract; interfaces have no implementation whatsoever for any methods.

What happens as we use strictfp modifier with class and interface ?

I just knew that strictfp can't be used with variables?
I want to know that why we use strictfp with class and interface?

makpandian wrote:
i hope i can understand if you explain myself.Okay, let me go ahead and try to explain yourself.
The concept of a makpandian can be summed up as the following: a simple-minded, java forum-goer who posts questions directly from his SCJP 6 study guide in hopes that forum members will give him a simple answer that he can correlate to a multiple-choice response. By doing this, the makpandian suspects that passing the SCJP 6 exam will become a tangible reality, thus enabling it to obtain a job in the public work sector (given the great significance of this type of certification in the makpandian's presumed country of origin (India, for those of you who aren't following along)).
So how'd I do? Did I do a good job of explaining yourself?

A map to keep track of classes and interfaces of all api's

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