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What are the two ways to create the thread?
A) by implementing RunnableB) by extending ThreadC) Both a and bD) None of the above
ajaykumargurrala
- Jan 11th, 2012
In 2 ways by extending the Thread class & implementing Runnable interface
Hitesh Thakkar
- Oct 23rd, 2011
1. extends the Thread class
2. implements Runnable interface
answer is C -
In order for a source code file, containing the public class Test, to successfully compile, which of the following must be true?
A) It must have a package statementB) It must be named Test.javaC) It must import java.langD) It must declare a public class named Test
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Which of the following methods cause the String object referenced by s to be changed? (Select multiple)
A) s.concat( )B) s.toUpperCase( )C) s.replace( )D) s.valueOf( )
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A method is overridden if there is a method in the subclass that has the same name and the ________ set of parameters.
Skill/Topic: InheritanceA) SameB) DifferentC) MixedD) None of the above
Karuna Reddy
- Jun 6th, 2008
same parameteroverriden: super class, method declared as private than sub class method can't be overriden.super class method declared as defalut ie emepty than subclass method should be the same o...
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__________ code segments must be implemented for an event handler.
Skill/Topic: AWT & AppletsA) OneB) TwoC) ThreeD) Four
murali
- Mar 5th, 2012
Three
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Whether final method can be overridden or not?
H.D.A.sanoj
- Nov 22nd, 2011
We can not override a final method but it is possible to overload.when we use a final key word with a method it'll stop all modifications of the method so we can not override or inherit its properties
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Why we need to serialize the object
balajifortest
- Oct 26th, 2006
Hai, Seralization is the process of converting object into file streams this becausein order to transfer it through out the network.if u use SOAPFormatter it seralizes to XML File where as Binar...
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What is the usage of this keyword in java?
suman
- Jun 13th, 2006
I would like to give you an explanation of using this(). Suppose we have class A having method1(), class B extends A having method1().IN lass B we need to call method1() of classB.if we call it ...
ashwinsware
- May 22nd, 2006
Hi Friends, The this keyword in java has two uses It is used to get the current object that is the object on which the curr...
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Why would I want to make a class final? Doesn't that defeat the whole purpose of OO?
pdommara
- Oct 6th, 2010
If you are sure on that behaiour of your class and sure that no one from outside world should not change the its behaviour, then you can make the class as final. Thats why java have String class as final why bcas java authors dont want to change its bahaviour.
Deepak Sharma
- Dec 22nd, 2006
exactly, it is used only for encapsulation for hiding the information.eg.. string class is also defined as final..if u want to see more than see the rt.jar in which all the classes are defined in jdk141_05jrelibrt.jar.thanx and regardsDeepak Sharma
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Can you invoke the methods on a Thread once it is stopped?
BattleLr
- Jan 31st, 2007
People ...get the question right.
1) Once thread is in a dead state, it CANNOT be restarted
2) However, its methods and instances will STILL be accessible.
@philip, dude post answers AFTER getting your facts straight...if your're not sure..
write a test code and then BE sure.philipp
- Sep 1st, 2006
No once a thread is stopped.It goes to the dead state hence we cannot invoke methods.If a thread is in suspend state(depricated) we can invoke methods.
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What is transient variable
Srilatha
- Dec 5th, 2006
When an instance variable is declared as transient, then its value need not persistwhen an object is stored.
srinivasaraobora
- Oct 11th, 2006
Hi,This is srinivas from geektalk.When we need not to be serialized an object then we go for object to be declared as transient. this is the real time situation we need to use transient.when we use DT...
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What is synchronization and why is it important
With respect to multithreading, synchronization is the capability to control the access ofmultiple threads to shared resources. Without synchronization, it is possible for onethread to modify a shared object while another thread is in the process of using orupdating that object's value. This often leads to significant errors.
bijuleo
- Nov 8th, 2007
Synchronization is the mechanism that ensures that only one thread is accessed the resources at a time. In a practical point of view assume that two threads are trying to update bank balance at the sa...
priya
- Sep 13th, 2007
Synchronisation is a phenomenon in multithreaded programming which enforce synchronicity when we need it. For eg, if we want two threads to share a complicated datastructure?we need to ensure that th...
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What are wrapped classes
Wrapped classes are classes that allow primitive types to be accessed as objects.
Djava
- Aug 10th, 2009
Wrapper Classes are like a wrapper over a resource that is If I have to access a resource I can access it throught that wrapper.For example:'java.lang.Integer' is a wrapper class. with r...
tech.abha
- Feb 3rd, 2009
Wrapper classes are classes that are used to make primitive variables into objects, and to make wrapped objects into primitives. int, boolean, double are all primitive data types and their respective ...
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Can a for statement loop indefinitely
Yes, a for statement can loop indefinitely. For example, consider the following:for(;;) ;
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To what value is a variable of the String type automatically initialized
The default value of an String type is null.
jigyasa_sienna
- Jun 7th, 2009
Just to reuse the code in a new way. It helps by not making the
correction in the superclass instead of that just simply changing the body of
method without changing the signatures of that method.
Java Interview Questions
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