Whts the need of static ....

Simple code....
in the following code ... wht is the need of "static"
import java.io.*;
public class sample
static int a=34;
public static void main(String args[])
System.out.println(a);
What "Static " actually means?

What "Static " actually means?It means a field (as in your sample) is associated with the class, as opposed to being associated with the single instances of that class.
You could (I dare assume) and should read the documentation before asking such questions, since they -- presumably -- will explain it better (accumulated accuracy) than anybody here will.
http://java.sun.com/docs/books/tutorial/java/javaOO/classvars.html

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What is the need for static block?

this was my interview question..
what is the scenario where u need a static block?

SO
public static String foo = "FOO";
and
static
public String foo="FOO";
both are static blocks?I don't know what the JLS says about that term. The second one is usually called a static initializer. I wouldn't consider the first one a block, but the JLS may say differently.
What is the difference between both?They're not quite the same.
public static String foo = "FOO";
// is equivalent to
public static String foo;
static {
foo = Foo;
}Note that the variable must be declared outside the block to be a class member variable.
Now, consider the following, for which the static initializer block is necessary:
static ComplexThingummy ct;
static {
try {
    ct = new ComplexThingrummy();
    ct.initializeSomethingSomehow();
catch (CTCheckedException exc) {
    throw new ExceptionInInitializerError(exc);
    // OR
    ct = someDefaultPreInitializedComplexThingummy;
}

Avoiding the need to compile static content...

Hi,
In the absence of any way to download fonts on the fly for mobile content, particularly iOS, I am forced to compile around 70MB of fonts into the app. This, needless to say, takes A Long Time. And every time I change anything, it seems to be done _again_.
But the fonts don't change...
Can anybody suggest a way to still include the fonts as compiled, embedded media but without the need to recompile them each and every time? For example, if I have them as compiled SWF CSS, can I embed those in a way that will avoid the need to tie up my "Build workspace" task?
Thanks,
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Dear Sir/Mam,
We had purchased licenced version of adobe acrobat x pro
We are facing issues while embedding the font in the pdf file
Please find the below mentioned requirement
Requirement:
We have a pdf file (template) with some static images and static text in it
We need to populate dynamic data in the pdf file for this we may use text boxes
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Queries
Please let us know how to embed the needed fonts in the pdf file?
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There is a similar post just a few away from yours. I will suggest what I would try. Open your job settings file (press or print preferred to get all fonts) and then select the properties and the font tab. At your font to the always embed list and you will likely need to uncheck the subset box. Then save your job settings (give it a name that is meaningful to you, you can not use the settings file you started with as they are read only and I do not recommend changing that). Maybe that will do the job. Of course that is for the creation of the PDF, I forgot you were talking about a form. You might check the form field properties, but I suspect you have already tried that. Guess I don't play with forms enough. Others may be by to answer.

How to get the class name static method which exists in the parent class

Hi,
How to know the name of the class or reference to instance of the class with in the main/static method
in the below example
class AbstA
public static void main(String[] args)
System.out.println(getXXClass().getName());
public class A extends AbstA
public class B extends AbstA
on compile all the class and run of
java A
should print A as the name
java B
should print B as the name
Are there any suggestions to know the class name in the static method, which is in the parent class.
Regards,
Raja Nagendra Kumar

Well, there's a hack you can use, but if you think you need it,Could you let me the hack solution for this..
you probably have a design flaw and/or a misunderstanding about how to use Java.)May be, but my needs seems to be very genuine..of not repeat the main method contents in every inherited class..
The need we have is this
I have the test cases inheriting from common base class.
When the main method of the test class is run, it is supposed to find all other test cases, which belong to same package and subpackages and create a entire suite and run the entire suite.
In the above need of the logic we wrote in the main method could handle any class provided it knows what is the child class from which this main is called.
I applicate your inputs on a better way to design without replicating the code..
In my view getClass() should have been static as the instance it returns is one for all its instances of that class.
I know there are complications the way compiler handles static vars and methods.. May be there is a need for OO principals to advance..
Regards,
Raja Nagendra Kumar
Edited by: rajanag on Jul 26, 2009 6:03 PM

I really need abstract static methods in abstract class

Hello all.. I have a problem,
I seem to really need abstract static methods.. but they are not supported.. but I think the JVM should implement them.. i just need them!
Or can someone else explain me how to do this without abstract static methods:
abstract class A {
abstract static Y getY();
static X getX() {
    // this methods uses getY, for example:
    y=getY();
   return new X(y); // or whatever
class B extends A {
static Y getY() { return YofB; }
class C extends A {
static Y getY() { return YofC; }
// code that actually uses the classes above:
// these are static calls
B.getX();
A.getX();I know this wont compile. How should i do it to implement the same?

Damn i posted this in the wrong thread.. anyways.
Yes offcourse i understand abstract and static
But i have a problem where the only solution is to use them both.
I think it is theoretically possible ot implement a JVM with support for abstract static methods.
In fact it is a design decision to not support abstract static methods.. thats why i am asking this question.. how could you implemented this otherwise?
There is an ugly soluition i think: using Aspect Oriented Programming with for example AspectJ.. but that solution is really ugly. So anyone has an OO solution?

Require the definition of static members in derived classes

What I would like to do is require the definition of static variable with a particular signature in all implementing/extending classes of T.
I would have thought this could be done in the following way:
public template T
{public static final Object obj;}To me, this says that all classes implementing this interface must define a member with this exact signature. This is not the case.
Basically, I'd like to replicate the behavior I see when I extend a serializable class. I get this warning : "The serializable class X does not declare a static final serialVersionUID field of type long".
Anyone know how to do this? I've googled many search strings, and looks on the forums extensively. I could potentially use code weaving (Aspects), but this adds another level of complexity to my project.
Thanks in advance,
Luke

There is a definite use for it.
I have an ObjectFactory A. Upon initializing a copy of this object, it scans the given package for all classes. Each class is inspected via Reflection. If there is a variable with a particular signature, in my case public static final ObjectFactory.Constructor, we get a copy of the static variable and add it to a TreeMap.
Then, whenever someone calls ObjectFactory.createInstance("class name"), I do a lookup, and invoke a method of the Contructor object to return an instance of that object. Also, the ObjectFactory allows the programmer to list all "extensions" loaded in this manner.
The reason I'm doing this instead of simply putting a static initializer in the "extension" class that would register the extension with the ObjectFactory is:
I want to control when and where extensions are registered.
Does this makes sense?
The only thing I am missing, is how to warn (other than through documentation) the programmer that they need to define this field, exactly in the same manner as classes extended from serialized classes receive a warning that "The serializable class X does not declare a static final serialVersionUID field of type long".
I could do this using Aspect oriented programming, but that adds a layer of complexity that I do not need.
Here is the code:
public class ObjectFactory<T extends Object>
     private TreeMap<String,Constructor<T>> cons=new TreeMap<String,Constructor<T>>();
     public ObjectFactory(String pkg)
          ClassLoader cld=Thread.currentThread().getContextClassLoader();
          if(cld==null)
               throw new NullPointerException();
          String path=pkg.replace(".","/");
          URL tmp;
          Enumeration<URL> resources;
          File dir;
          try
               resources=cld.getResources(path);
               while(resources.hasMoreElements())
                    try
                         tmp=resources.nextElement();
                         dir=new File(URLDecoder.decode(tmp.getPath(), "UTF-8"));
                         if(dir.exists())
                              String[] files=dir.list();
                              for(String file:files)
                                   try
                                        if(file.endsWith(".class"))
                                             Class<?> c=Class.forName(pkg + '.' + file.substring(0, file.length() - 6));
                                             try
                                                  Field f=c.getField("constructor");
                                                  //TODO add type checking
                                                  Constructor<T> con=Constructor.class.cast(f.get(null));
                                                  synchronized(cons)
                                                       cons.put(con.getName(),con);
                                                       System.out.println(con.getName());
                                             catch(IllegalAccessException ignored)
                                             catch(NoSuchFieldException ignored)
                                   catch(ClassNotFoundException e)
                    catch(UnsupportedEncodingException e)
          catch(IOException e)
     public interface Constructor<T>
          public T createInstance();
          public String getName();
     public T createInstance(String name) throws FactoryNotFound
          Constructor<T> c=cons.get(name);
          if(c==null)
               throw new FactoryNotFound();
          return c.createInstance();
import ObjectFactory.Constructor;
public final class Extension
     public static final String desc="";
     public static final String name="Test01";
     public static final Constructor<Object> constructor=new Constructor<Object>()
          public Object createInstance()
               return new Fighter();
          public String getName()
               return name;
}

What is the benefit of static in a method/function

hello,
can u explain the benefit of static in a function?
and why i cannot called a function in a static method..example :
class jalaninFungsi{
     public static void main(String args[])
          tesfungsi();
     public void tesfungsi()
          System.out.println("ini tesfungsi");
}its produce error : non-static method tesfungsi() cannot be referenced from static context
thanks.

A class is an object.
So for example:
class STUDENT
public String getStudentName()
return name;
public int getStudentGPA()
return GPA;
In this case, to be able to call the function getStudentName() and getStudentGPA() you will actually need a STUDENT object.
That means you must have declared e.g. STUDENT A; (in the main method for example), then to call those two functions above you'll need to write A.getStudentName(); and A.getStudentGPA();
HOWEVER if you have static method, you don't need to create an object of that class type. You can just simply call the class name and then use the dot operator and call the function. e.g.:
class STUDENT
public static String getStudentName()
return name;
public static int getStudentGPA()
return GPA;
Notice that these are static methods, so to access these methods you just need to write STUDENT.getStudentName(); or STUDENT.getStudentGPA();
Again, notice that here I don't use A . but instead I used the class name (STUDENT.)
However, this is not logically correct in this (my) particular case to make those two methods static. You'll need to read more by yourself about the usage of static method. I am just trying to explain it to you why there is such thing called static methods in java.
- o.z.

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nybody pls explain in details?
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and read some basic tutorial .
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Whts the need of static ....

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