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What is the purpose/uses of run-time polymorphism? Is dynamic binding only way to achieve run-time polymorphism?
sflebrun
- Sep 15th, 2009
Run-time polymorphism provides the ability to use late-binding. In other words, the function called or the data member accessed is not determined until run-time and is based on the type that a v...
goksn
- Sep 14th, 2009
Purpose of Runtime polymorphism:Run time polymorphism is a mechanism by which a call to overriden function is resolved at runtime rather than compile time.For e.gIf (user clicks link 1) then{obj1.over...
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Inner classes
What are advantages of inner class
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ssalguti- Member Since Apr-2008 | Apr 25th, 2008
Logical grouping of classes—If a class is useful to only one other class, then it is logical to embed it in that class and keep the two together. Nesting such "helper classes" makes their package more streamlined.
Increased encapsulation—Consider two top-level classes, A and B, where B needs access to members of A that would otherwise be declared private. By hiding class B within class A, A's members can be declared private and B can access them. In addition, B itself can be hidden from the outside world.
More readable, maintainable code—Nesting small classes within top-level classes places the code closer to where it is used.
goksn
- Sep 14th, 2009
Defining a class within another class is known as nested class.If class B is defined within class A, then B is known to A, but not outside of A.Class B has access to the members, including private members of the Class A.However,the class A does not have access to the members of Class B.
ssalguti
- Apr 25th, 2008
Logical grouping of classes—If a class is useful to only one other class, then it is logical to embed it in that class and keep the two together. Nesting such "helper classes" makes th...
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What is aggregation and composition of objects?What is the diff between monolithic and composite object?
talktoatish
- Aug 19th, 2009
A monolithic object is an object that has no externally-discernible structure. Said another way, a monolithic object does not appear to have been constructed from two or more other objects. Spec...
rajagobals
- Sep 14th, 2006
Aggregation differs from ordinary composition in that it does not imply ownership. In composition, when the owning object is destroyed, so are the contained objects. In aggregation, this is not necess...
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Serializable is used to read or write the object and find the state of an object. What is the use of finding the state of an object, Explain with an example?
VenkitaKrishnan
- Apr 20th, 2009
The concept of Serializable is that we can recreate the state of an object from a permanent source like a file, xml etc.Example: I had personally implemented used in scenario where i had an organizati...
richakharya
- Apr 20th, 2009
When the object supposed to be sent across the network serializing technique makes sure the data is not lost in case of network failure. Seralizaing? is converting the object to its?byte code form and then sending it accross the network.
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How the abstract classes in CMP are converted into concrete classes?
pokiri
- Oct 29th, 2008
By extending the abstract class by other class and creating object to that class
BINOD KUMAR MISHRA
- Aug 4th, 2005
I want to maintain our LAN through JAVA can U help me ?
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What is the need of an abstract class?
If I write all of concrete methods in one class and all abstract methods in an interface and extend and implement both in third class assume that third class don't extend any other class?
alkumar2000
- Aug 15th, 2008
Abstract is most useful when you are creating a framework..take the example of template method pattern which is used in the templates provided by spring framework for the support of jdbc or hibernate...
sampra
- Feb 13th, 2008
If we have some method which body is not defined till declartion of class and body is implemented in subclass later then declare that class as abstract class.If a class has atlest one abstract method then we have to declare class as abstract class
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How can i call a funtion,given its name as string?
sampra
- Mar 10th, 2008
Class clsObj = Class.forName("ClassName"); Method method = clsObj.getMethod("methodName",null); method.invoke(clsObj.newInstance(),null);
ashishvyas_83
- Mar 1st, 2007
We can also call the method using Introspection API, Eclipse uses this API to get the name of all the methods available in a class after we enter "." after a Class Instance or Class Name for static methods;
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Why in case of java header file name is not required ?
CHANDRA SEKHAR JONNALAGADDA
- Jun 11th, 2006
hi friends java having a classes and packeges so no need to header file in java. so header file is not required. by...
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What is uni code
sampra
- Mar 10th, 2008
In unicode all character availbale in the world has been assign with a unique number that is for internationalization
Jagadeesh.gowd
- Jul 26th, 2007
What is Unicode? Unicode provides a unique number for every character, no matter what the platform, no matter what the program, no matter w...
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What is diff between union / union all
ramanareddy devarapalli
- Jun 18th, 2007
UNION does it will not allows duplicate value, where as UNION ALL allows the duplicate values.
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What is an inline class?
sampra
- Feb 13th, 2008
A class which is define inside a class is known as inner class inner class can be static but top level class can not be static.
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What is the difference between Unicode and hash code?
sampra
- Feb 13th, 2008
Unicode is used for globlization ie its support all languages its use for globlization where as hash code is a unique number which is given to object by JVM .hash code is implement by some...
sarithahere528
- Oct 23rd, 2007
Equal objects should have the same hashcode ... i.e when u go for overridding a equal() method , u should override hashcode() also
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What are java archives?
sampra
- Feb 13th, 2008
Java archive is the collection of builtinn or user define packages(.class file)
sarithahere528
- Oct 23rd, 2007
Friends i have a small doubt ... i heard that Jar will supported by all platforms and Zip wont suport is it true ?
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Class Outer{int a;Outer (){a=10;}public static void main(String args[]){final Outer o1=new Outer();Outer o2=new Outer();class inner{inner(){o1.a=20;//allowed//o2.a=30; not allowed}}}}Why inner classes can access only final variables as illustrated? Thanks in advance!
Kumar
- Aug 21st, 2006
Inner classes can also access method parameters that are declared to be final.
omaha_inky
- Jun 1st, 2006
From www.javaranch.com:The inner class can't use local variables from the method in which the inner class is defined! After all, at the end of that method, the local variables will be blown away. Poof...
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What are the three steps to deploy EJB?
hmashruf
- Apr 6th, 2006
Hi,The final step should be to deploy deployable jar.With Best Regards-ashruf
zhousx18
- Dec 26th, 2005
1.Adjust Deployment Descriptors2.Perform Server-Specific Configuration3.Generate Container-Specific Classes
Java OOPS Interview Questions
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