Tag: programming languages

Questions Related to programming languages

What base class do all Web Forms inherit from?
technology programming languages

  1. Web class

  2. Page class

  3. Data class

  4. Html classs

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Correct Option: B

Which is the best place to store connectionstring in .NET projects ?
technology programming languages

  1. Session

  2. Cookie

  3. Web.config

  4. Variable

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Correct Option: C

Can you call one constructor from another if a class has multiple constructors?

technology programming languages

  1. True

  2. False

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Correct Option: A

Which of the following lines will compile without warning or error.
technology programming languages

  1. float f=1.3;

  2. char c="a";

  3. byte b=257;

  4. int i=10;

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Correct Option: D

A byte can be of what size?
technology programming languages

  1. -128 to 127

  2. (-2 power 8 )-1 to 2 power 8

  3. -255 to 256

  4. depends on the particular implementation of the Java Virtual machine

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Correct Option: A

What will be printed out if this code is run with the following command line? java myprog good morning public class myprog{ public static void main(String argv[]) { System.out.println(argv[2]); } }
technology programming languages

  1. myprog

  2. good

  3. morning

  4. Exception raised: "java.lang.ArrayIndexOutOfBoundsException: 2"

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Correct Option: D

Which of the following are keywords or reserved words in Java?

technology programming languages

  1. if

  2. then

  3. goto

  4. case

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Correct Option: A,C,D

What will be printed out if you attempt to compile and run the following code ? int i=1; switch (i) { case 0: System.out.println("zero"); break; case 1: System.out.println("one"); case 2: System.out.println("two"); default: System.out.println("default"); }

technology programming languages

  1. one

  2. one, default

  3. one, two, default

  4. default

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Correct Option: C

Given the following declarations String s1=new String("Hello"); String s2=new String("there"); String s3=new String(); Which of the following are legal operations?

technology programming languages

  1. s3=s1 + s2;

  2. s3=s1-s2;

  3. s3=s1 & s2;

  4. s3=s1 && s2

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Correct Option: A

AI Explanation

To answer this question, you need to understand the operations that can be performed on strings in Java. Let's go through each option to understand why it is correct or incorrect:

Option A) s3 = s1 + s2 - This option is correct because the + operator can be used to concatenate strings in Java. It concatenates the string represented by s1 with the string represented by s2 and assigns the result to s3.

Option B) s3 = s1 - s2 - This option is incorrect because the - operator cannot be used with strings in Java. It is used for arithmetic operations and is not applicable to strings.

Option C) s3 = s1 & s2 - This option is incorrect because the & operator is a bitwise operator and cannot be used with strings in Java. It is used for bitwise operations on integers.

Option D) s3 = s1 && s2 - This option is incorrect because the && operator is a logical operator and cannot be used with strings in Java. It is used for logical operations on boolean values.

The correct answer is A. This option is correct because the + operator can be used to concatenate strings in Java.

You need to create a class that will store unique object elements. You do not need to sort these elements but they must be unique. What interface might be most suitable to meet this need?

technology programming languages

  1. Set

  2. List

  3. Map

  4. Vector

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Correct Option: A