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Q: What is it reflection (introspection) ? Why is reflection possible in the Java language?
Reflection (introspection) is querying a class about its properties, and operating on methods and fields by the name for a given object instance. Reflection is possible in the Java language because of late binding.
Mithun Challa
- Jan 8th, 2008
There are generally two types of reflection1) Introspection2) IntercessionIn Interospection we can see the features of a class or object of our interest using the methods available. Java just supports...
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And What situation , each of the 4 drivers used
suvarna_man
- Jan 11th, 2008
JDBC ODBC bridge Driver is generally most appropriate when automatic installation and downloading of a Java technology application NATIVE API driver converts JDBC calls into calls on the client ...
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What is wrong in the following code?pulic synchronized void setXXX(String s){ this.setXXX(s);}public synchronized String getXXX(){...}orpulic synchronized void setXXX(String s){ return (this.getXXX());}
GEEK_ALOK
- Jan 15th, 2008
There is a return statement in the set() method because return type of this method is void.............
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Int [ ] [ ] scores = { { 1, 2, 3} , { 2, 4, 6}, { 3, 6, 9} };how many objects in heap after the above stmt ?
satabdi_d
- Jan 15th, 2008
The preceding code creates a total of four objects on the heap. First, an arrayof int arrays is constructed (the object that will be assigned to the scoresreference variable). The scores array has a l...
venkatgonu12
- Aug 24th, 2007
two dimensional array object. but only one object will be created when you created new object created that memory stored only one object
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If a variable is declared as private, where may the variable be accessed
A private variable may only be accessed within the class in which it is declared.
Mithun Challa
- Jan 6th, 2008
It may be accessed in any of the methods defined in that class. Generally for the security of the variables we declare them as private and using the public methods in the class we use them. Makinng sure that variables are accessible only in that class
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Referencing of Instances
class A { // some code here} class B { // some code here}class Ex {public static void main(string args[]) {A a=new B();B b=new A();a.add();b.add();}Will this program run? Explain the referencing the object instances. What is the result;
craig.cattell
- Jan 15th, 2008
No it will not compile - as A does not extend B nor vice-versa when you try to assign an object of type B to a reference of type A (and vice-versa) you will get an 'Incompatible type' error me...
foiaz
- Dec 27th, 2007
Yes, this program will execute. Reference variables a and b holds the object instance of Class B and Class A respectively. i.e it points to the memory locations of those objects.a.add() will call the add() method of Class B. and b.add() will call the add() method of Class A.
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_________ are light-weight components
Skill/Topic: AWT & AppletsA) Swings
karthik
- Jun 13th, 2006
SWINGS are lightweight componenets, They are in 3Dshape
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What is instance of operater & Why and When it is used.
amoham19
- Jan 18th, 2008
instanceof is used to test an object's typeExample:Pizza myPizza = new Pizza();boolean test = myPizza instanceof Pizza;
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How to retrieve email ids from distribution list?
We have a small requirement where we need to retrieve the e-mail ids of all the employees in the distributed list using LDAP, can any one give an idea how it can be done?
aravind.pk
- Jan 31st, 2008
Hey did you got answer for your query? i too is in requirement of answer for your query.infact, my requirement is "how to access and display the contacts in a distribution list using java?"
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What is the diffrence between composition and aggrigation?
kim2kim
- Feb 1st, 2008
Aggregate is when one object contains other objects. Think of aggregate as "is a part of". Composition is when one object controls the life span of another object.
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What modifiers may be used with a top-level class
A top-level class may be public, abstract, or final.
mrkab
- Nov 15th, 2007
The modifiers a top-level class can have are public and either abstract or final. A nested class is any class whose declaration occurs within the body of another class or interface. A top level class ...
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What is the return type of a program's main() method
A program's main() method has a void return type.
sampra
- Feb 13th, 2008
default return typ of any any main method is int but we change it as per requirment if return typ is other than void then must write return stmt
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Is it true the JAVA is realy a plateform indepandent?
no, because Java does not support multiple inheritance directly.
Basil
- Sep 14th, 2007
JAVA is platform independent. It means it can run in any platform. The thing is that? the platform should have capability to run class file. The class file organised as it can run in any platform. Thread and other stuff mentioned are concept.
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What is the difference between connection pool and data source
shaik subhani
- Feb 14th, 2008
Actually to use connection objects in the connection pool we need datasource object .if you take weblogic , if u want to contact to connection pool , u must get data source object. Thats all.
prasanna_b2001@yahoo.com
- Feb 7th, 2008
I dont think we can compare connection pool and data source.Both serves to access the database thru our application.If you create a connection pool in your web/app server then you can use them and acc...
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What must a class do to implement an interface
It must provide all of the methods in the interface and identify the interface in itsimplements clause.
salembalan
- Feb 15th, 2008
Interface enhance the concepts of inheritence. by calling multiple interfaces to class we can also inherinting more than a class indirectly
Mithun Challa
- Jan 6th, 2008
A class (someName) which wants to use features of the interface(someInterfaceName) must use implements keyword like class someName implements someInterfaceNameIt must define all the methods in t...
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What is mean by Referential intigrity?Which language understands web browsers?
dgshivas
- Feb 25th, 2008
Referential Intigrity is nothing but Primary Key concept in OracleBrowsers only understand HTML ,but we dont run servletes and jsp's at broweser side we run them at server side we get the values and we embed them with HTML
deepak
- Nov 24th, 2007
Browsers understands only HTML language and therefore we are able to run servlets and JSP in the browser as Servlet is HTML embedded in Java and JSP is Java enbedded in HTML.
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Imagine there is a class Employee. We create an object of EmployeeEmployee a= New Employee();If we are givingSystem.out.println(a);What gets printed?
dgshivas
- Feb 25th, 2008
If we try to print instance of a class,toString() method gives the out put of hashcode.First if prints the possible appropriate class name followed by @ symbole and hashcode of the class instance.
shivkant.pawan
- Nov 26th, 2007
It call the toString() method of Object class and print string representation of the object. i.e @<hashcode of the object>.
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How come hashcodes can be the same even if objects aren't equal?
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Java Interview Questions
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