Tag: programming languages

Questions Related to programming languages

Which of the following will compile correctly

technology programming languages

  1. short myshort = 99S;

  2. String name = 'Excellent tutorial Mr Green';

  3. char c = 17c;

  4. int z = 015;

Show answer
Correct Option: D

AI Explanation

To answer this question, let's go through each option to understand why it is correct or incorrect:

Option A) short myshort = 99S; - This option is incorrect because the suffix "S" is not a valid identifier for a short variable in Java. If you want to assign a value to a short variable, you can simply write "short myshort = 99;".

Option B) String name = 'Excellent tutorial Mr Green'; - This option is incorrect because single quotes ('') are used to represent characters in Java, not strings. To declare a string variable, you should use double quotes (""). Therefore, the correct statement would be "String name = "Excellent tutorial Mr Green";".

Option C) char c = 17c; - This option is incorrect because the suffix "c" is not a valid way to represent a character value in Java. If you want to assign a character value, you can use single quotes. For example, "char c = '17';".

Option D) int z = 015; - This option is correct because the value "015" is a valid octal (base-8) representation in Java. The leading zero indicates that the value is in octal format. Therefore, this statement will compile correctly.

The correct answer is D.

Which of the following are Java key words
technology programming languages

  1. double

  2. Switch

  3. then

  4. instanceof

Show answer
Correct Option: A,D

TreeMap class is used to implement which collection interface. Select the one correct answer
technology programming languages

  1. SortedMap

  2. Tree

  3. Set

  4. SortedSet

Show answer
Correct Option: A
Explanation:

To solve this question, the user needs to know what the TreeMap class is used for and which collection interface it implements.

The TreeMap class in Java is used to implement a map interface that sorts the keys in natural order. It provides an efficient means of storing key/value pairs in sorted order, making it useful for scenarios where you need to perform operations such as lookups, insertions, and deletions in a sorted collection.

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

A. SortedMap: This option is correct. TreeMap implements the SortedMap interface, which extends the Map interface and provides additional methods for retrieving and manipulating elements in a sorted order.

B. Tree: This option is incorrect. While TreeMap is implemented using a tree structure, it does not directly implement the Tree interface.

C. Set: This option is incorrect. TreeMap does not implement the Set interface, which is used for collections of unique elements.

D. SortedSet: This option is incorrect. TreeMap does not implement the SortedSet interface, which is used for sorted collections of unique elements.

The Answer is: A

Which of the following is the correct syntax for suggesting that the JVM performs garbage collection?
technology programming languages

  1. System.free()

  2. System.setGarbageCollection()

  3. System.setGarbageCollector()

  4. System.gc()

Show answer
Correct Option: D

True or False: You don’t need to specify a default value for an optional parameter
technology programming languages

  1. True

  2. False

Show answer
Correct Option: B

How many fields are maintained by the runtime by each instance of a reference type?
technology programming languages

  1. One Field

  2. Two Fields

  3. Three Fields

  4. Four fields

Show answer
Correct Option: B

The concept in VB.NET by which one can provide a new implementation for the base class member without overriding the member is called as
technology programming languages

  1. Shadowing

  2. Late Binding

  3. .NET Reflection

  4. All of the above

Show answer
Correct Option: A

Which of the following namespace provides classes that can be used to create and manipulate custom performance counters?
technology programming languages

  1. System.NET.DNS

  2. System.Data.Common

  3. System.Diagnostics namespace

  4. none of the above

Show answer
Correct Option: C

Which of the following happens when the FormBorderStyle property is set to None in VB.NET?
technology programming languages

  1. borderless form is made

  2. The form cannot be moved

  3. Both A and B

  4. None of the Above

Show answer
Correct Option: C

What is the significance of the option explicit statement when it is set to ON

technology programming languages

  1. Specifies that any variable name is declared (with type) before use

  2. Specifies whether String should be compared as binary

  3. Specifies that variables should be intialized before use

  4. All of the above

Show answer
Correct Option: A
Explanation:

To understand the significance of the option explicit statement when it is set to ON, the user needs to know about the Option Explicit statement in Visual Basic for Applications (VBA) programming language.

The Option Explicit statement is used to explicitly declare all variables in a VBA code module. When Option Explicit is turned on, the user must declare all variables before they are used in the code. If a variable is not declared, VBA generates a compile-time error.

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

A. Specifies that any variable name is declared (with type) before use - This option is correct. When Option Explicit is turned on, it requires you to declare all variables before they are used in the code. This helps prevent errors and ensures that all variables have a defined type.

B. Specifies whether String should be compared as binary - This option is incorrect. The Option Compare statement is used to specify how VBA compares strings, not the Option Explicit statement.

C. Specifies that variables should be initialized before use - This option is incorrect. Option Explicit only requires variables to be declared before use, not initialized.

D. All of the above - This option is incorrect. Option Explicit only specifies that variables must be declared before use, not any of the other options listed.

Therefore, the correct answer is:

The Answer is: A