Question 1

public class Test { public static void main(String... args) { for(int i = 2; i < 4; i++) for(int j = 2; j < 4; j++) if(i < j) assert i!=j : i; } }

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The class compiles and runs, but does not print anything
The number 2 gets printed with AssertionError
The number 3 gets printed with AssertionError
compile error

Answer

Correct Option: A

Question 2

What is the output for the below code ? public interface TestInf { int i =10; } public class Test { public static void main(String... args) { TestInf.i=12; System.out.println(TestInf.i); } }

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Compile with error
10
12
Runtime Exception

Answer

Correct Option: A

Question 3

What is the output for the below code ? public class Test { static { int a = 5; } public static void main(String[] args){ System.out.println(a); } }

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Compile with error
5
0
Runtime Exception

Answer

Correct Option: A

Question 4

What is the output for the below code ? class A { { System.out.print("b1 "); } public A() { System.out.print("b2 "); } } class B extends A { static { System.out.print("r1 "); } public B() { System.out.print("r2 "); } { System.out.print("r3 "); } static { System.out.print("r4 "); } } class C extends B { public static void main(String[] args) { System.out.print("pre "); new C(); System.out.println("post "); } }

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r1 r4 pre b1 b2 r3 r2 post
r1 r4 pre b1 b2 post
r1 r4 pre b1 b2 post r3 r2
pre r1 r4 b1 b2 r2 r3 post

Answer

Correct Option: A

Question 5

What is the output for the below code ? public class Test { public static void main(String... args) throws Exception { Integer i = 34; int l = 34; if(i.equals(l)){ System.out.println(true); }else{ System.out.println(false); } } }

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true
false
Compile Error
Runtime Exception

Answer

Correct Option: A

Question 6

A variable which is declared inside a method is called a________variable

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Serial
Local
Private
Static

Answer

Correct Option: B

Question 7

Two methods with the same name but with different parameters?

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Overloading
Overriding
Overridable
Duplexing

Answer

Correct Option: A

Question 8

Is there any errors in this -> EmployeeMgmt constructor: Public int EmployeeMgmt { emp_id = 100; }

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Return type
No errors
Formal parameters
Name

Answer

Correct Option: A

Question 9

If a class is using an interface....

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it must inherit the properties of the interface
contain the same methods as the interface
create an interface object
all of the above

Answer

Correct Option: D

Question 10

Sealed Classes cannot be a base class?

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True
False

Answer

Correct Option: A

Question 11

What are the features of an abstract class?

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It contain instance variables
It contain constructors
It may extend another class
All of the these

Answer

Correct Option: D

Question 12

Features of Read only variables?

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It is allocated at compile time
Declaration and initialization is separated
It is allocated at runtime
All of these

Answer

Correct Option: A

Question 13

An Event has _____ as default return type?

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No return type for events
Double
Integer
String

Answer

Correct Option: A

Question 14

int keyword targets to which .Net type?

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System.Int8
System.Int16
System.Int32
System.Int64

Answer

Correct Option: C

Question 15

Difference between Convert.ToString() and ToString()

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Convert.ToString() handle null values but ToString() don't
ToString() output as per format supplied
Convert.ToString() only handle null values
ToString() handle null values but Convert.ToString() don't

Answer

Correct Option: A

Question 16

Boxing in .Net allows the user to convert?

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a interger type to double
a reference type to a value type
a value type to a reference type
a double type to interger

Answer

Correct Option: C

Question 17

Different ways a method can be overloaded in C#.NET?

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Different parameter data types
Different number of parameters
Different order of parameters
All of these

Answer

Correct Option: D

Question 18

Which of the following is incorrect about System.Text.StringBuilder and System.String?

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StringBuilder is more efficient when there is a large amount of string manipulation
Strings are immutable, so each time a string is changed, a new instance in memory is created.
StringBuilder is mutable; when you modify an instance of the StringBuilder class, you modify the actual string, not a copy
Strings are mutable in .Net

Answer

Correct Option: D

Question 19

What is accessibility modifier “protected internal”?

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It is available to classes that are within the same assembly and derived from the specified base class.
It is available within the class definition
It is the most permissive access level
It is the least permissive access level

Answer

Correct Option: A

Question 20

What is the .NET collection class that allows an element to be accessed using a unique key?

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HashTable
ArrayList
SortedList
All of above

Answer

Correct Option: A

Description: programming languages Online Quiz - 25
Number of Questions: 20
Created by: Aliensbrain Bot
Tags: programming languages

programming languages Online Quiz - 25

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