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Inheritance and Aggregation
What is the difference between inheritance and aggregation? When would you use one over the other
mvrao.bsc
- Jun 12th, 2008
In Inheritance we have to extend the class where as in Aggregation no need to extend.Directly we can make use of other class in current class by creating object of other class(if required).
mvrao.bsc
- Jun 12th, 2008
What is the difference between inheritance and aggregation? When would you use one over the other?
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What is the catch or declare rule for method declarations
If a checked exception may be thrown within the body of a method, the method musteither catch the exception or declare it in its throws clause.
vegetto
- Jun 15th, 2008
this rule is actually for handling the exceptions:that is there are two ways by ehich u can handle the exception :1:either you use the try catch statement and enclose the appropriate code in the try c...
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How are this() and super() used with constructors
This() is used to invoke a constructor of the same class. super() is used to invoke asuperclass constructor.
vegetto
- Jun 15th, 2008
this() is used to specify the current class or the child's class constructor alwaysand super() refers to the parent's class constructorTo use them follw the rules:super()has to be the first li...
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What is the result of the following?public static void main(String[] args)
choice:a)compilation errorb)runtime errror Or what is the result?
vegetto
- Jun 16th, 2008
It will result in a compilation error because first thing is that you have not written method body ,else if you don't want to write method body then declare it abstract and terminate it using semi colon.
agsuvidha
- Aug 14th, 2007
This is perfectly fine as this is just an alternate way to create arrays int a[] or int[] a is exactly same
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How do you add two numbers using bitwise operators ?
leena singhal
- Jun 16th, 2008
We can add 2 numbers using xor operator but it will not handle carry therefore, we first use and operator on those 2 numbers n den take a xor of dem ...shift d res of and by 1 bit and den wil xor again the res of shift with d prev xor res....until carry=0i thnk it will work
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Subclass is the class that does the inheriting (the child class)
Skill/Topic: InheritanceA) TrueB) False
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Print Command Line Arguments
How to print Command Line Arguments without using IO Classes?
aswinikalapeeti
- Jun 20th, 2008
you can print command line arguments, by giving what to print while executing java program.the code for this isclass Demo{ ...
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When we will use an Interface and Abstract class
konnipati.sivaa
- Jun 25th, 2008
When To use Interface: An interface allows somebody to start from scratch to implement your interface(or) implement your interface in some other code whose original or primary purpose was quite differ...
Karuna Reddy
- Jun 24th, 2008
Interface:Code resuabilityAcheive multiple inheritenceIf u can add any method that does not effect the classAbstarctionIf u does not want instance of the class then we go for bstartcion
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What are the access modifiers in Java
padma
- Oct 7th, 2005
Modifiers r nothing but which add additional meaning to variables,methods and classes.they r: 1)static 2)Final
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What is meant by Java interpreter
banduskank
- Jun 30th, 2008
Java interpreter translate the java Byte code into machine level lang for excuting the program.
Radhey Krishna Yadav
- Apr 18th, 2006
Java interpreter is a translator which translates the source code of java line by line
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Difference between Java and J2ee
Explain the difference between Java and J2EE in detail?
deepak_tandon2005
- Jun 30th, 2008
Java refers to basic concept of java as well as new technical features making foundation of java/j2ee.j2ee is used for enteprise application based on java concept.if java is foundation then j2ee is building for business purpose.
r.praveenkumar
- Mar 20th, 2008
java refers to core java and j2ee refers to the technologies that are developed using java. for example inheritance, exception handling, multithreading are some of the concepts in java and servlets, R...
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What is meant by final class, methods and variables
yogeshpanda
- Sep 22nd, 2005
Final as name suggest its the final value i.e its final nothing to be done over itIf say for variable-then we cant change its value.If for method-then we cant override or overlod it.Similar to it is-...
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What is the Map interface
The Map interface replaces the JDK 1.1 Dictionary class and is used associate keys withvalues.
Prabhas270
- Jul 5th, 2008
Hi There, Map is one of the datastuctures provided by Sun.Map is an interface ,it is not extending from Collection interface as like List,Set,Queue does.There are 4 Classes which are implemented ...
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Can we invoke an applet using servlets?if yes how?
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Java Singleton Class
How to create a class that has only one object?
atmarammuduli
- Jul 10th, 2008
Refer my previos rep:Method 3 is a way to create per thread singleton object. ie. every thread will have its own singleton object for its own disposal.Method 2,1 will fall into a waiting state for singleton object until freed from other thread, adding to performance issue.
atmarammuduli
- Jul 10th, 2008
There r several way to create Singleton object:1. By using single static private object & using a static method while returning same object on every call. 2. using a static boolean flag for checki...
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Fill in the blanks :- Which method waits for the thread to die______________ ?
A) join()
parthu
- Feb 21st, 2006
answer is join() method.I have answered join() method,why it is giving wrong questions
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Abstract class can be declared as final
Skill/Topic: InheritanceA) TrueB) FalseExplanation: An abstract class may not be declared as final.
Buddhadev Dasgupta
- Jan 19th, 2006
Abstract class can't be declare as final.The reasion behind it that, If we declare a class as abstract then we can't intanciate that class ( only we can extend that class) . And if create aa class as ...
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DataOutput
What is the basic functionality of DataOutput interface in java?
aleemkh
- Jul 22nd, 2008
The DataOutput interface provides for converting data from any of the Java primitive types to a series of bytes and writing these bytes to a binary stream.
aleemkh
- Jul 22nd, 2008
DataOutputStream is the class which implements DataOUtput Interface. The DataOutput interface provides for converting data from any of the Java primitive types to a series of bytes and writing these bytes to a binary stream.
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