Most asked interview questions in java

Posted Date: 23 Mar 2008 Resource Type: Articles/Knowledge Sharing Category: Placement Papers

Posted By: Logeshwaran Member Level: Gold
Rating:

Points: 3

1.what is oops?
2.write about(a)explicit/implicit keywords
(b)overloading/overriding
3.what is connection pooling?
4.what is marshalling(rmi)
5.what are the different drivers in JDBC?
6.what is session tracking ,what are the different
ways of session tracking?
7.write the output of the following
public class hello
{
static
{
System.out.println("hello");
}
}
(a)compile time error
(b)runtime error
(c)Hello
(d)none of these
Ans:b,c
8
public class testit
{
public static void main(String args[])
{
First s=new Second();
Second s2=(Second)s;
System.out.println(s2.var);
s2.method();
}
}

class First
{
int var=1;
public void method()
{
System.out.println(var);
}
}

8)class Second extends First
{
int var=2;
public void method()
{
System.out.println(var);
}
}

options:
(1).2 (2).1 (3)2 (4)1
2 2 1 1
Ans:(1)2,2

class one
{
public void test()throws Exception1,Exception2
{// do something
}
}
class two extends one
{
public void test()
{
do another thing
}
}
If another class that extends two is written and if
it
overrides test method which of the
following Exceptions should it throw
(a)no exception
(b)Exception1
(c)Exception2
(d)some other Exception

9.
which of the following are used to find the length
of
a string
(a).length();
(b).length
(c).length;
(d)none of these

10.write a program to draw concentric circles on a
frame

11.write a program to reverse a given string

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