Interview Questions Answers in Core Java, Databases AllOther, Advanced Java, OOPS, SAP ABAP, JSP

Questions / { manikandan }

Questions Answers Category Views Company eMail

i need to know the website that i can compile and run a java code in online.(while system doesn't contain any jdk and jre)

Core Java 1575

can any one explain about normalization forms with clear explanation in interview point of view. thanks for ur answers.

1 Databases AllOther 5074

Answers / { manikandan }

Question { 11929 }

What is meant by Java interpreter?

Answer

it converts byte code into machine understandable code and
JVM does this job.

Is This Answer Correct ?

10 Yes

2 No

Question { 5604 }

What is daemon thread?

Answer

what said above is correct and it can b created by using
method setDemon()

Is This Answer Correct ?

2 Yes

0 No

Question { HCL, 48047 }

is java purely oop Language?

Answer

yes,java is purely oop language.int char etc are simple data
types this are not used for application.we use only wrapper
classes in the application.i asked HR and he replied this
answer.the thing is java supports simple data types too.

Is This Answer Correct ?

1 Yes

0 No

Question { HCL, 48047 }

is java purely oop Language?

Answer

Java is purely OOPL.primitives are simple datatypes in java
all the collections classes are uses wrapper class only not
a simple data types In all the applications we uses wrapper
class only not a primitives.we use primitives only for a
learning purpose and java supports native language that so
primitives still lives in java

Is This Answer Correct ?

5 Yes

0 No

Question { 7770 }

why the primitive data type have classes?

Answer

there are different type of data types such as int,char
etc.for example suppose if we using arrays it can store a
similar data types but we need to store a char and int in a
same array what can we do for this situation. the wrapper
class helps in this situation by storing a objects in to a
arrays.

example

ArrayList v=new ArrayList();
v.add(new Integer(1));
v.add(new Character('a'));//

the int and char are different type but we stores it by an
object.

Is This Answer Correct ?

2 Yes

2 No

Question { 9224 }

what is the difference between statis block and static
variable

Answer

static variables hold only one value and static block is a
set of code. static variables and static methods are loaded
before a main method.it loads one by one in top down approach.

consider this code:

class test
{
static{
System.out.println(i);//compile error bcas top down approach
}

static int i=1;
public static void main(String[]asd)
{

}
}

Is This Answer Correct ?

6 Yes

1 No

Question { Bally Technologies, 25897 }

Can we override static methods?

Answer

Dear yogesh, overriding is not a compile time polymorphism
so u have to run the code.

static methods can't override
pls run below example

class test extends a
{
public static void main(String[]asd)
{
a as=new test();
as.a();//it'll not invoke a() from class test
}
static void a()
{
System.out.println("test");
}
}
class a
{
static void a()
{
System.out.println("a");
}
}

out put: a

as.a(); this line'll not invoke the method a()from class
test instead it'll invoke a a()method from class a so there
is no overriding.

Is This Answer Correct ?

2 Yes

1 No

Question { Honeywell, 13773 }

Which is not Object in Java?

Answer

simple data types are not object in java but java is 100%
object oriented bcas simple data types are not used for
storing in a database and collection classes are support
Wrapper classes and v used it for mostly studying
purpose.this is wat i know from a HR.

Is This Answer Correct ?

4 Yes

0 No

Question { Wipro, 13750 }

how many index created for table

Answer

only two indexes.one primary and one secondary.ABAP
developer said me.

Is This Answer Correct ?

0 Yes

6 No

Question { 5240 }

Hello,
I'm java developer. My skill is programming with java,jsp,
struts, struts2+spring, hibernate, eclipse, tomcat,
mysql,Oracle,Middlegen and other open source technology. I'm
interest work any web base project that use my ability
above. The thing is that I have never got any chance to work
in this field though i am very much comfort with my skills.
So if any body want me then i will happily join you.

Also I have also some of my friends if you. If you interest
to outsource any project to me then also you are welcome.

you can reach me by email at me4bangalore@yahoo.in

Answer

hi some one first improve Ur English then say for others

Is This Answer Correct ?

2 Yes

0 No

Question { 13058 }

Is System.err.println(""Statement"); is execute the output
on console .
Example:
System.err.println("Hello JAVA");

Answer

yes,It'll print Hello JAVA in red color in IDE but in
command prompt it'll print all in same color

Is This Answer Correct ?

4 Yes

4 No

Question { 4921 }

Which is best centre in chennai.. i am wil study to java...
pls help me..

Answer

better u join NIIT in Nungambakkam but no one will not teach
you good.you can prove urself by do it own interest.

Is This Answer Correct ?

5 Yes

1 No

Question { 8739 }

What are the similarities between an array and an ArrayList?

Answer

both array and arraylist can store a duplicate elements in
un ordered way.

Is This Answer Correct ?

14 Yes

0 No

Question { Tech Mahindra, 6789 }

what is multi-tasking

Answer

multi tasking,multiple programes can b run at a same time.
ex:we can run a mp3 player while we using another
application such as word but both application gets keep
running with out interrupt with one another

Is This Answer Correct ?

17 Yes

0 No

Question { 4278 }

Consider that class classA, abstract class classB, and
final classC have been defined.Which one of the following
is correct?
1. classA extends classC implements classB
2. class A extends classB, classC
3. classA extends classB
4. classB implements classC

Answer

answer is 3) classA extends classB

Explanation:

Final Class Can't b extend with any other class but we can
instantiated.

Is This Answer Correct ?

2 Yes

0 No