java contest-35

[keerthi]

Answer the following



1)Can you have virtual functions in Java?



2)What is more advisable to create a thread, by implementing a Runnable interface
or by extending Thread class?





3)what is a platform?



4)What is JVM?


Edited by: keerthi

[sk_kireeti]

3)what is a platform?
It is an environment in which we can execute our programs.


4)What is JVM?
It is an interpretor which converts java byte code into executable format so that the program can be executed in the given platform or environment.

Edited by: sk_kireeti

[nishant_jaina]

hi

1) in java functions are automatically virtual, i mean the method of that class will be called who's object is made.

2) It totaly depends upon the need of the code that what u

3) & 4) I am satisfied with the Kireeti's answer..

[pgnvssskumar]

2)What is more advisable to create a thread, by implementing a Runnable interface or by extending Thread class?

Runnable interface is more flexible to create a thread.

implementing the Runnable interface only requires an implementation for the run() method. Since Runnable is an interface, you can still extend from another class.

In thread class, a single inheritance facility provided in java.

If you extended from one thread, you cannot extended from another thread. Where, Runnable interface can be exteneded from any other class.

3)what is a platform?

A group of computer programs that help to manage the computer’s resources. It acts as an interface between the computer and its application programs.

[maheshkp]

hi guys
i want to know what is a ?
1. testing tools
2. advantages
3. how to learn

[pgnvssskumar]

1) If we use any class,can create objects only. There isno modication on objects,if we implements an interface then we have own implementation?

My openion is that , in java ifwe developimplementation objects are more flexible? Is there any facility in java?

[sriya]

hi guys

can v have global variables in java?

pls do answer this ques?

[savita_solankar]

ya the instance var r global only.

[Laxminarayanak]

Q:- Can you have virtual functions in Java?
Reply :
Virtual in c++ mean that it will give the latest implementation of the method
in java mehtods are by default virtual.
Ex:
Class A{
public String firstTestMethod(String k,String n){
return "";
}
}
Class B Extends A{
public String firstTestMethod(String k,String n){
return "FromCLassB "+k+" "+n;
}
}


Class C{
public static void main(String args[]){
B b=new B();
System.out.println(b.("Hello From","Main"));
}
}

Out put is
:FromCLassB Hello From Main

[deepesh]

no, we can't have global variables in java...
JVM has three things;
1. Class loader
2. class verifier
3. interpreter.....

[TAM]

global variables breaks encapsulation hence java didn't support global variabels