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As the Swings have more advantages over the AWT.. Why still in market are they using AWTs??plzz..i want answer..in many interviews they asked me the same.
srilatha249
- May 30th, 2007
Why are will still using awt if swings has more advantages than awt.are there any specific features in awt that are not present in swings
takumar
- Aug 2nd, 2006
since swings is even developed on the top of awt for example we have jbutton which is similar to button in awti.e; swings package is related to awt
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Can array with zero length exist in Java?
swapnil
- Sep 17th, 2013
Yes, array size in java is always 0 bz array is start with 0th location
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Why was Java Created?
PlatForm Indepentdent ,security,Garbage Collection.
nishant.mca2010
- Dec 17th, 2010
Java was created to make programming simple and easy. Designing the Java simple was the main aim of the Java creator (Java Soft people). When Java was developed, they wanted it to be simple because i...
jimmy514in
- Apr 22nd, 2010
Java is created for simple OOP.It doesnt use multiple inheritance for simplicity hence it is not pure OOP.Java uses JVM, hence it is platform independent.Java uses collections hence it is easy to code...
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Explain run time , complile time in terms of polymophism
santh kumar
- Dec 19th, 2006
To say more clearly, After compilation,JVM takes byte code of resource(Proramme). At that time it doesnt know which method is called by which object. In the case of Overloading, JVM knows which m...
hi_goura
- Dec 4th, 2006
Polymorphism mean "One name, different work" and when this is applied on methods, we are having to versions of usingthe same method name with different functionality. They are "Method Overloading" and...
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Can we create a class in a method if it is possible how to access that class?
dileep
- Jan 24th, 2007
You can create a class in a method as a normal way.That type of classes are known as "Method Local Inner Class". You can access the member variables as well as the methods of your Outer Class.You can ...
santh kumar
- Dec 19th, 2006
See the following code: public class InnerClassEx { public void test(int a) { final int p=a; final class X { public void a() { System.out.println("it's statement from inner class:...
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What is the Difference between Runtime and RunTime java API's?
Vibs
- May 17th, 2007
You can writepublic static void main(String a[]) { Runtime rt = Runtime.getRuntime(); System.out.println("result::"+rt); try {rt.exec( "notepad.exe"); } catch (IOException e) { // TODO A...
santh kumar
- Dec 14th, 2006
Runtime is one of classes in Java and it's super class remains same as we know(java.lang.Object). A java Programme can have only a single instance of this class "Runtime". that means, Runtime rt = ...
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HiRecently at an interview I was asked the following question:Create a hashtable A, assign key value pairs to it and then set A to null. Will it be garbage collected?Please reply.
jimmy514in
- Oct 31st, 2010
Objects which have null references are garbage collected ..But you can just request the garbage collector algo to start..you cannot command it..so when it would be collected is not known..Also, a null reference attached to object is called as weak referenceAnd weak references are garbage collected.
vinaymudgil007
- Jun 11th, 2008
Yes the hashtable would be avaliable for garbage collection BUT when actually is would be collected that would depend on JVM garbage collection cycle.vinny
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What are the difference between java.sql package and javax.sql package
vijay
- May 18th, 2012
Javax.sql provides connection pooling ,distributed transaction,disconnected rowsets
sampra
- Feb 15th, 2008
Java.sql.* package is used for the basic jdbc connections.javax.sql.* package is used for the advance jdbc. Advance is connection pooling, rowsets...ect.
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What is the difference between Assertion and Exception?
raghuprasad
- Aug 25th, 2008
There is no concept called Assertion present in Java. Exception is the program error which arises due to uncontrolable condition. This condition can be arised automatically from to program code(Eg. Da...
raj_sharma
- Aug 22nd, 2008
Exception is a mechanism used by many programming language to describe what to do when something unexpected happens.Assertion is the way to test the certain assumptions about the logic of your program.
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SetEx setEx1 = new SetEx("Java");
String str1 = new String("Java");
String str2 = new String("Java");
s.add(setEx);
s.add(setEx1);
s.add(str1);
s.add(str2);
System.out.println("No Of elements in the Set is " + s.size());
}
What is the result and how?">Import java.util.*;public class SetEx { private String str; SetEx(String s) { str = s } public static void main(String[] ar) { Set s = new HashSet(); SetEx setEx = new SetEx("Java"); SetEx setEx1 = new SetEx("Java"); String str1 = new String("Java"); String str2 = new String("Java"); s.add(setEx); s.add(setEx1); s.add(str1); s.add(str2); System.out.println("No Of elements in the Set is " + s.size()); }What is the result and how?
james.vinett
- Aug 24th, 2009
The result is 3 even though you would want it to be 2.You MUST override equals() and hashCode() for proper use of add in HashSet.
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What is "JIT ENGINE" in Java?
james.vinett
- Aug 24th, 2009
The just-in-time compiler compiles byte code into native machine language when it first encounters it and then reuses that compiled code rather than recompiling it again. This give performance gains over the interpreter model which interprets the byte code every time it encounters it.
sampra
- Feb 14th, 2008
jit reads the whole byte code and exceute once where as interpretaor does it by line by line
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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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Explain interthread communication.
Radhakrishna P
- May 11th, 2009
When threads are running in shared resources we can manage the threads by using native methods (wait(), notify(), notifyAll()) from Object class.This is inter process communication between the threads while sharing shared resources
AjayMukiri
- Apr 30th, 2008
Java provides a basic set of synchronisation methods within java.lang.Object, allowing threads to wait for notification from other threads. Using the wait() and notify() methods, threads can synchroni...
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Difference Between Collection and Legacy classes
What are the difference between Legacy classes and Collection other than Synchronized?
udaya.kumar
- Dec 12th, 2008
Legacy Classes : Previously Collection Frame Work was not part of java.util package. Later some of the classes were re-engineered Known as Legacy Classes. Legacy Classes are SYNCRONIZED(Ctrlng accessibility over the resource).Ex:Vector/Stack/Hashtable/Dictionary/Properties.
sampra
- Feb 11th, 2008
legacy class are syncronized by defult where as collection's member are not syncronized by deflt
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How to catch an Error occurred in a class
Can we catch an Error occurred in a class by extending that class with Throwable Since, Exception and error is the sub class of throwable.If yes/no- why?
sampra
- Feb 20th, 2008
We can handle the exception but we cabt handle error super call of both is throwable
onelastman
- Jan 8th, 2008
yes...u can handle that error by extending with our class with throwable...but it is not recommended to do...pls don't consider errors as same to the exceptions..both are different...Errors ...
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Illegal State of Exception
When does thread throws illegal state of exception?Explain with two scenarios?
mkgraumt
- Sep 27th, 2008
Any attempt to change the status after the thread has been started, throws an IllegalThreadstateException.Scenerio 1If a thread has already started and you try to call method setDaemon(boolean) on thr...
charankk
- Apr 29th, 2008
Hi,There are one scenario where we can use it as shown below.Two threads within the JVM both gain access to the same object. One thread invalidates the object and then the other thread attempts ...
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Generating ppt through java
I am trying to generate ppt through Java using Apache POI API. I am able to create table, bulleted text etc using this API. Please answer the following two questions, if anyone is aware of this. 1. How to split text across two slides, if the row had to be broken across 2 slides because the row is so big that it can only be accommodated in 2 slide ? 2. How to re-size table cell , if the text...
ashishthakran
- Jul 28th, 2014
A list of few more Java interview questions like
1. By default, Java is pass by reference or pass by value. How does it handle?
2. In which scenario, you will use custom exceptions in Java.
3. How does garbage collection work in JavaOmen
- Nov 8th, 2013
Try this Java Library, i hope it will solve your problem:
http://www.aspose.com/java/powerpoint-component.aspx -
Serialization Process
Explain the use of serialization process in real time projects?
Read Best Answer
Editorial / Best Answer
Sarje- Member Since Aug-2009 | Aug 28th, 2009
Serialization is the process of writing the state of an object to a byte stream. This is useful when you want to save the state of the object (content of the object) to a persistent storage area, such a file.
For example if you want to maintain record of the temprature on a particular place at every hour then you can serialize your object and save the temprature at every hour in a file.
Only an object that implements the java.io.Serializable interface can be saved.dh_maan
- Jun 6th, 2010
The use of serialization process in real time project is to transfer the object over the network.
winoth4
- Oct 28th, 2009
Serialization is writing the state of the object to a byte stream. This is useful when you want to save the state of the object in a persistent ?storage such as file.
Core Java Interview Questions
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