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Memory Allocation
What is the difference between below 2 statements?
String s1=new String("abc");String s2="abc";How it will allocate in memory?gaurav
- Jun 15th, 2012
in String s1 = "Hello World"; // "Hello world" is a constant and it will be allocated in the string pool. all the variables refering to "Hello World" constant will refer to same memory location in th...
sampra
- Mar 13th, 2012
String s1=new String("abc");- creates 2 obj one in jvm and one in pool.
String s2="abc"; no obj will create it will point to pool above already created existing obj -
In CORBA, the 'MessageError' GIOP type is used for?
Sandhya.Kishan
- Jun 22nd, 2012
"Messageerror" GIOP type is sent as a response to the malformed or otherwise invalid messages. It is not used to report errors outside the messaging system; such errors are reported using the Reply message.
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Which of the following are valid types of COM servers
A: In-process B: Local and remote C: All of the above D: None of the above
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If there are more than one main method in a program, then which main method will be called.
what will be the output
class A
{
public static void main(String args[])
{
System.out.println("Hi friend");
}
}
class Test
{
public static void main(String args[])
{
System.out.println(" How are you");
}
}
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Abstract class and interfaces
Where should we use exactly abstract class and interfaces?
rpmnitp
- Jul 13th, 2012
Interface is more generic in comparison to the Abstract class, hence when we want our implementing class to implement all the methods we should use Interface.
yuvaraj
- May 11th, 2012
All the methods declared inside an interface are abstract whereas abstract class must have at least one abstract method and others may be concrete or abstract. b) In abstract class, key word abstract...
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When does the String Literal pool gets cleared?
In one java class I have created this string String s1 = "abc";Now if I again use this same statement in a different java class, ie;String s2 = "abc";Will I get the same reference for "abc" in both the classes.
adarsh
- Jul 30th, 2012
"c public class stringreferencetest { public static void main(String[] args) { String s1 = "abc"; class AnotherClassString { String s2=""; public AnotherClassString() {...
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How can u tell HashTable is Synchronized?(IBM-chennai)
John
- Apr 3rd, 2007
HashTable is synchronized
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What is difference between runnable and thread ?why we use static class
AMIT GURJAR
- Sep 21st, 2012
Sir please tell me that when a thread never return desired result then why we use it?
prabakaran29
- Aug 19th, 2012
Thread class can be extend only one class where as we using runnable interface can be implement many classes.so runnable interface is the best to implement the block of code
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Search text from file in directories
Efficient way to find word from file in directory?
However directory contains huge number of files -
What is ClassDefNotFoundException and NoClassDefFoundError and explain differences between these two?
Ganga_busi
- Oct 25th, 2012
A NoClassDefFoundException is thrown if a class is referenced with Javas "new" operator (i.e. static loading) but the runtime system cannot find the referenced class.(that means whenever the JVM tr...
PriyankN
- Mar 10th, 2011
To understand this better, run this example by keeping only one block uncommented,compiling and then removing class Test2 before running:public class NoClassDefFoundTest{ public static void main(Strin...
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Platform Independence
Why platform independence is needed in real world ?
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Inner Class
Can we decalre java inner class as private and protected?
If yes....please explain
If No....please explain -
How Treeset implementation maintains unique elements in it?
How an Treeset maintains the unique element? Which algorithm does it use?
What is the advantages over doing the same using the Arraylist manually?Prasad MN
- Mar 11th, 2013
Tree Set using internally HashTable for storage the objects using of key and values. Internally its using hashing mechanism. It displays the order on Ascending order.
Nikhil
- Feb 20th, 2013
It uses Red-Black tree alogorithm.
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Compare two dates from input box using javascript
How to compare two dates from input box using javascript?
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Can a method be static and synchronized
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Editorial / Best Answer
Answered by: Srimant Misra
- Aug 12th, 2005
A static method can be synchronized. If you do so, the JVM will obtain a lock on the java.lang.Class instance associated with the object. It is similar to saying:
synchronized(XYZ.class)
{
}Akii
- May 21st, 2013
If you synchronized on static method ,its lock on class level not only that method.
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Adding Method in Java
Hi
I have interface in that interface 3 methods are there , after some days client said that,i want to add one more method in that interface ,so how can add 4 method so that the implemented class did not affect,
Thanks
Kalins Naik
sivapurammani
- Jul 4th, 2013
If we implement any new method in Interface then by default that method is public and abstract, So the classes which are implementing that interface should implement that method that is one way in whi...
akii
- Apr 30th, 2013
Make a class abstract in this class you do not need to implement all methods of interface .
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MVC architecture
what is the difference between MVC1 & MVC2 in Java?
sivapurammani
- Jul 10th, 2013
MVC(Model-View-Controller) :: This type of architecture makes our code to be reusable and separation of code. View :: Which presents the modal data, example if we are presenting any tabular data or c...
Prasad MN
- Mar 11th, 2013
MVC1: Its a model view Controller architecture 1 that means all the presentation logic and business logic is mixed up. If any modification is required on its impact on the logic. Difficult ...
Core Java Interview Questions
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Ans