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What is the interface of thread?
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What is the use of static block?
sampra
- Feb 15th, 2008
static block is the set of stmnt between {} and declared as static its exceute at class loading time
sujatham
- Aug 10th, 2007
The primary use of static initializers blocks are to do various bits of initialization that may not be appropriate inside a constructor such that taken together the constructor and initializers put the newly created object into a state that is completely consistent for use.
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What is the difference between compile time error and run time error?
salembalan
- Feb 14th, 2008
The output of compile time error is errorsthere wont be output in runtime erroeg required : int found : byte is compile time error0/2 is runtime error
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What is the purpose of using interfaces?Where and how we use it?
sampra
- Feb 14th, 2008
If you want to change the design of the application at the time of implementation
vijay DJ
- Aug 16th, 2007
If you want to change the design of the application then we will go for the Interface.
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WHEN UR USING ARRAYLIST AND LIKEDLIST AND VECTOR AND HASHMAP AND HASHTABLE?
sampra
- Feb 14th, 2008
LIST - Ordered by index, Duplicates Allowed.ARRAYLIST - Faster Iteration & fast random accessLINKEDLIST - Faster deletion, Insertion than ArryListVECTOR - Synchronized, Go ...
santu
- Sep 7th, 2007
ArrayList it is used for faster access LinkedList is for more insertation and deletion
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What do you mean by Legacy Class?
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What types of variables we can access inside the static inner class?
Raju
- Sep 26th, 2007
Public variable
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How to kill all the threads in a program in one command.
Masood
- Sep 21st, 2007
We can terminate a thread, actully there is no method defined, but we can terminate a thread by just asignning its refrence to null;
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Is it advisable to depend on finalize for all cleanups
archikinu
- Oct 2nd, 2007
No it is not advisable to depend on finalize, because we cannot know when -- or even if -- finalize will be executed.
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What is the difference throw and throws
sampra
- Feb 14th, 2008
throw when toy have to send exception or userdefine exception by your own.throws is use to throw method level exception
priyaranjan
- Oct 3rd, 2007
Thow is a excptionThrows is a error
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What is whitespace in Java?
psuresh1982
- Oct 25th, 2007
Whitespace in Java is used to separate the tokens in a Java source file. Whitespace is required in some places, such as between access modifiers, type names and Identifiers, and is used to improve rea...
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What are the different kinds of exceptions? How do you catch a Runtime exception
sampra
- Feb 14th, 2008
1.Checked Exceptions Environmental error that cannot necessarily be detected by testing; e.g. disk full, broken socket, database unavailable, etc. 2.Runtime Exceptions Programming ...
Shagufta Mogal
- Oct 30th, 2007
Two kinds of exceptions:unchecked exceptions and checked exceptions.Inside the standard java.lang package ,Java defines several exception classes.Most of the exceptions are subclasses of standard type...
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What are the primitive types in Java
sampra
- Feb 14th, 2008
primtive datatyp is non object datatypeint chat short byte long float double boolean
teju
- Nov 5th, 2007
Primitive type means .int char double float string single long .............
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What is the need for calling default constructor by JVM? why the JVM should intiializes default values to the data fields if the constructor is not there in our class?
sampra
- Feb 14th, 2008
use of default constructor is to create the default object of type java.lang.Class which is done by JVM
Raghava
- Nov 20th, 2007
First, Let us understand the concept of construcotrs. The constructors are used to construct objects. This is the Only way to create object. If we did not write any constructor in our class, the compl...
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Which on is best string or string buffer?which one is mutable and immutable?
sampra
- Feb 14th, 2008
String types are immutable and String buffer are mutable.StringBuffer have synchronized methods. String have unsynchronized.We cant say best any one its depnd on situation
aarbee
- Nov 28th, 2007
> StringBuffer have synchronized methods. String have unsynchronized methods.So one can use StringBuilder in Java 1.5
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In How Many ways can we create an OBJECT in Java ? Illustrate.
sampra
- Feb 14th, 2008
perfect ans:Here is the list I formed: 1) using new 2) Serilaization 3) Shallow cloning 4) Deep cloning ý same is serialization 5) Reflection/ Class.newInstance()
Sagar
- Nov 27th, 2007
Here is the list I formed: 1) using new 2) Serilaization 3) Shallow cloning 4) Deep cloning ? same is serialization 5) Reflection/ Class.newInstance()
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What is the default Transaction(Txa) Attribute in
1)SessionBean 2)EntityBean 3)MessageDriven Bean
Core Java Interview Questions
Ans