Question 1

Method-Overloading implements the principle of Compile-time Polymorphism, wheras Method Over-riding implements the concept of Runtime Polymorphism.

technology programming languages

True
False

Answer

Correct Option: B

Question 2

JVM is the compiler for Java.

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True
False

Answer

Correct Option: B

Question 3

How many objects are created in the below code...????

String s="abc";  
String s1=new String("def");

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1 Object
2 Objects
3 Objects
4 Objects

Answer

Correct Option: C

Question 4

What is the concept Below???

class A  {
    int x=10;
};

class B extends A  {
    int x=100;
    show()     {
        System.out.println(x);
    }
    public static void main(String... s)  {
        B b1=new B();
        b1.show();
    }
};

The program will print 100. But the concept illustrated is----

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Data Shadowing
Data Over-riding
Data Obscuring
None of the Above

Answer

Correct Option: D

Question 5

What is the output??(Easy One)

String s1="Java";
String s2="Java";
String s3=new String("Java");
String s4=new String("Java");
if(s1==s2)  System.out.print("true");
else  System.out.println("false");
if(s3==s4)  System.out.print("true");
else  System.out.println("false");
if(s1==s3)  System.out.print("true");
else  System.out.println("false");
if(s2==s3.intern())  System.out.print("true");
else  System.out.println("false");
if(s3.intern()==s2.intern())  System.out.print("true");
else  System.out.println("false");

Just try and get the Ouput---(Ignore any errors)

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true false true false true
true false false true true
true false false false true
true false true false false

Answer

Correct Option: B

Question 6

Variables are not interpolated inside which operator when used normally?

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" "
< >
' '
/ /

Answer

Correct Option: C

Question 7

The regex /g.d?c*/ doesn't match

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godccc
gddd
goc
gc

Answer

Correct Option: B

Question 8

What is the outcome of the scenario on Unix platform: open(FH, ">c:\temp\notes.txt") ?

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Opens a file notes.txt
fails to create a file and displays error
fails to open a file but doesn't display error
Opens a file but not notes.txt

Answer

Correct Option: D

Question 9

$a=[ { name=> "rose", kids=> [ qw( ted bobby john ) ] }, { name=> "marge", kids=> [ qw( maggie lisa bart ) } ]

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A list of hashes which contains a list
A hash of hashes which contains a list
A list of list which contains another list
A list of arrays and hashes containing lists

Answer

Correct Option: A

Question 10

What happens when @_ is modified?

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when arrays and references are passed
only when references are passed
args are not changed
Command line args are changed

Answer

Correct Option: D

Question 11

%abc = %\$def which option is correct when $def = \%any_hash ?

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all key value pairs are copied but in random order
all key value pairs are copied in proper order
all key value pairs from def may not be copied into abc
syntax error

Answer

Correct Option: A

Question 12

what is the output for printf ("%06.2f", \$amt) when \$amt = 9.355 ?

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9.3550
9.4
009.40
Error

Answer

Correct Option: C

Question 13

($t, @u, $v, @w ) = qw( India US Japan Spain Mexico China ). How many elements are assigned to @u,@w?

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1 and 2
5 and 0
1 and 3
none of the above

Answer

Correct Option: B

Question 14

Out of below four cases

-5+5
" "
0X0
"0.00" + 0

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1 and 4
2 and 4
3 and 1
2 and 3

Answer

Correct Option: A

Question 15

&complex_num();
complex_num();

which is correct?

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1 can only be called with predecleration of complex_num
1 and 2 are same
2 can only be called with predecleration of complex_num
1 is reference to a subroutine

Answer

Correct Option: C

Question 16

Can we use the constructor, instead of init(), to initialize servlet?

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Yes
No
May Be
Can't Say

Answer

Correct Option: A

Question 17

Which of the following should NOT be used to share data between servlets in a distributed web application?

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Attributes of ServletContext
Enterprise Java Beans
Attributes of HttpSession
Database

Answer

Correct Option: A

Question 18

Can we call destroy() method on servlets from service method ?

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Yes
No
May be
Cant Say

Answer

Correct Option: A

Question 19

Which jsp implicit object is synchronized?

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session
page
application
None of the above

Answer

Correct Option: B

Question 20

Can we implement an interface in JSP ?

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Yes
No
May be
Cant say

Answer

Correct Option: B

Description: programming languages Online Quiz - 2
Number of Questions: 20
Created by: Aliensbrain Bot
Tags: programming languages

programming languages Online Quiz - 2

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