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programming languages Online Quiz - 25

Description: programming languages Online Quiz - 25
Number of Questions: 20
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Tags: programming languages
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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; } }

technology programming languages

  1. The class compiles and runs, but does not print anything

  2. The number 2 gets printed with AssertionError

  3. The number 3 gets printed with AssertionError

  4. compile error

Show answer
Correct Option: A

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); } }

technology programming languages

  1. Compile with error

  2. 10

  3. 12

  4. Runtime Exception

Show answer
Correct Option: A

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); } }

technology programming languages

  1. Compile with error

  2. 5

  3. 0

  4. Runtime Exception

Show answer
Correct Option: A

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 "); } }

technology programming languages

  1. r1 r4 pre b1 b2 r3 r2 post

  2. r1 r4 pre b1 b2 post

  3. r1 r4 pre b1 b2 post r3 r2

  4. pre r1 r4 b1 b2 r2 r3 post

Show answer
Correct Option: A
Explanation:

To understand the output of the given code, the user needs to know about the order of initialization of static and non-static blocks, constructors, and the concept of inheritance.

When the main method is executed, the following sequence of events will occur:

  1. The static block of class B will be executed first. It will print "r1 r4".

  2. The static block of class C will not be executed because it is not defined.

  3. The print statement inside the main method will execute and print "pre".

  4. A new object of class C is created using the default constructor.

  5. Since class C extends class B, the constructor of class B will be called first.

  6. Before the constructor of class B is called, the non-static block of class A will be executed. It will print "b1".

  7. The constructor of class B will be executed next. It will print "b2" and "r2".

  8. Before the constructor of class C is called, the non-static block of class B will be executed. It will print "r3".

  9. The constructor of class C will be executed last. It will not print anything.

  10. After the constructor of class C is called, the print statement inside the main method will execute and print "post".

Therefore, the output will be:

The Answer is: A) r1 r4 pre b1 b2 r3 r2 post

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); } } }

technology programming languages

  1. true

  2. false

  3. Compile Error

  4. Runtime Exception

Show answer
Correct Option: A

A variable which is declared inside a method is called a________variable

technology programming languages

  1. Serial

  2. Local

  3. Private

  4. Static

Show answer
Correct Option: B

Two methods with the same name but with different parameters?

technology programming languages

  1. Overloading

  2. Overriding

  3. Overridable

  4. Duplexing

Show answer
Correct Option: A

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

technology programming languages

  1. Return type

  2. No errors

  3. Formal parameters

  4. Name

Show answer
Correct Option: A

If a class is using an interface....

technology programming languages

  1. it must inherit the properties of the interface

  2. contain the same methods as the interface

  3. create an interface object

  4. all of the above

Show answer
Correct Option: D

Sealed Classes cannot be a base class?

technology programming languages

  1. True

  2. False

Show answer
Correct Option: A

What are the features of an abstract class?

technology programming languages

  1. It contain instance variables

  2. It contain constructors

  3. It may extend another class

  4. All of the these

Show answer
Correct Option: D

Features of Read only variables?

technology programming languages

  1. It is allocated at compile time

  2. Declaration and initialization is separated

  3. It is allocated at runtime

  4. All of these

Show answer
Correct Option: A

An Event has _____ as default return type?

technology programming languages

  1. No return type for events

  2. Double

  3. Integer

  4. String

Show answer
Correct Option: A
Explanation:

To answer this question, the user needs to have knowledge about programming events. In programming, an event is an action or occurrence detected by a program, and it can have a return type.

Now, let's go through each option and explain why it is right or wrong:

A. No return type for events: This option is incorrect because events can have a return type. The return type defines what kind of value the event handler method returns when the event is raised.

B. Double: This option is incorrect because the return type of an event depends on the type of data that the event is passing. An event can have a return type of any valid data type, including Double, Integer, String, and others.

C. Integer: This option is incorrect because the return type of an event depends on the type of data that the event is passing. An event can have a return type of any valid data type, including Double, Integer, String, and others.

D. String: This option is incorrect because the return type of an event depends on the type of data that the event is passing. An event can have a return type of any valid data type, including Double, Integer, String, and others.

The Answer is: A. No return type for events

int keyword targets to which .Net type?

technology programming languages

  1. System.Int8

  2. System.Int16

  3. System.Int32

  4. System.Int64

Show answer
Correct Option: C

Difference between Convert.ToString() and ToString()
technology programming languages

  1. Convert.ToString() handle null values but ToString() don't

  2. ToString() output as per format supplied

  3. Convert.ToString() only handle null values

  4. ToString() handle null values but Convert.ToString() don't

Show answer
Correct Option: A

Boxing in .Net allows the user to convert?
technology programming languages

  1. a interger type to double

  2. a reference type to a value type

  3. a value type to a reference type

  4. a double type to interger

Show answer
Correct Option: C

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

technology programming languages

  1. Different parameter data types

  2. Different number of parameters

  3. Different order of parameters

  4. All of these

Show answer
Correct Option: D

AI Explanation

To answer this question, we need to understand method overloading in C#. Method overloading allows us to define multiple methods with the same name but with different parameters. This enables us to perform different operations based on the arguments passed to the method.

Let's go through each option to understand why it is correct or incorrect:

Option A) Different parameter data types - This option is correct. Method overloading can be achieved by having methods with the same name but with different parameter data types. For example:

void Print(int num)
{
    // Do something with an integer parameter
}

void Print(string text)
{
    // Do something with a string parameter
}

Option B) Different number of parameters - This option is correct. Method overloading can also be achieved by having methods with the same name but with a different number of parameters. For example:

void Sum(int num1, int num2)
{
    // Do something with two integer parameters
}

void Sum(int num1, int num2, int num3)
{
    // Do something with three integer parameters
}

Option C) Different order of parameters - This option is correct. Method overloading can be achieved by having methods with the same name but with a different order of parameters. For example:

void Calculate(int num1, int num2)
{
    // Do something with two integer parameters in a specific order
}

void Calculate(int num2, int num1)
{
    // Do something with the same integer parameters in a different order
}

Option D) All of these - This option is correct. All of the mentioned options are valid ways to overload a method in C#. By combining different parameter data types, different numbers of parameters, and different orders of parameters, we can achieve method overloading.

The correct answer is D) All of these. This option is correct because all the mentioned ways are valid ways to overload a method in C#.

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

  1. StringBuilder is more efficient when there is a large amount of string manipulation

  2. Strings are immutable, so each time a string is changed, a new instance in memory is created.

  3. StringBuilder is mutable; when you modify an instance of the StringBuilder class, you modify the actual string, not a copy

  4. Strings are mutable in .Net

Show answer
Correct Option: D

What is accessibility modifier “protected internal”?

technology programming languages

  1. It is available to classes that are within the same assembly and derived from the specified base class.

  2. It is available within the class definition

  3. It is the most permissive access level

  4. It is the least permissive access level

Show answer
Correct Option: A

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

technology programming languages

  1. HashTable

  2. ArrayList

  3. SortedList

  4. All of above

Show answer
Correct Option: A
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