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programming languages Online Quiz - 2

Description: programming languages Online Quiz - 2
Number of Questions: 20
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Tags: programming languages

Can we implement an interface in JSP ?

  1. Yes

  2. No

  3. May be

  4. Cant say

Answer: 2

Which jsp implicit object is synchronized?

  1. session

  2. page

  3. application

  4. None of the above

Answer: 2

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

  1. Yes

  2. No

  3. May be

  4. Cant Say

Answer: 1

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

  1. Attributes of ServletContext

  2. Enterprise Java Beans

  3. Attributes of HttpSession

  4. Database

Answer: 1

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

  1. Yes

  2. No

  3. May Be

  4. Can't Say

Answer: 1
  1. &complex_num();
  2. complex_num();

which is correct?

  1. 1 can only be called with predecleration of complex_num

  2. 1 and 2 are same

  3. 2 can only be called with predecleration of complex_num

  4. 1 is reference to a subroutine

Answer: 3

Out of below four cases

  1. -5+5
  2. " "
  3. 0X0
  4. "0.00" + 0
  1. 1 and 4

  2. 2 and 4

  3. 3 and 1

  4. 2 and 3

Answer: 1

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

  1. 1 and 2

  2. 5 and 0

  3. 1 and 3

  4. none of the above

Answer: 2

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

  1. 9.3550

  2. 9.4

  3. 009.40

  4. Error

Answer: 3

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

  1. all key value pairs are copied but in random order

  2. all key value pairs are copied in proper order

  3. all key value pairs from def may not be copied into abc

  4. syntax error

Answer: 1

What happens when @_ is modified?

  1. when arrays and references are passed

  2. only when references are passed

  3. args are not changed

  4. Command line args are changed

Answer: 4

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

  1. A list of hashes which contains a list

  2. A hash of hashes which contains a list

  3. A list of list which contains another list

  4. A list of arrays and hashes containing lists

Answer: 1

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

  1. Opens a file notes.txt

  2. fails to create a file and displays error

  3. fails to open a file but doesn't display error

  4. Opens a file but not notes.txt

Answer: 4

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

  1. godccc

  2. gddd

  3. goc

  4. gc

Answer: 2

Variables are not interpolated inside which operator when used normally?

  1. " "

  2. < >

  3. ' '

  4. / /

Answer: 3

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)

  1. true false true false true

  2. true false false true true

  3. true false false false true

  4. true false true false false

Answer: 2

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----

  1. Data Shadowing

  2. Data Over-riding

  3. Data Obscuring

  4. None of the Above

Answer: 4

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

String s="abc";  
String s1=new String("def");
  1. 1 Object

  2. 2 Objects

  3. 3 Objects

  4. 4 Objects

Answer: 3

JVM is the compiler for Java.

  1. True

  2. False

Answer: 2

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

  1. True

  2. False

Answer: 2
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