Tag: programming languages

Questions Related to programming languages

Suppose you want to declare an array of the first five letters of the alphabet. How do you declare and initialize the array?
technology programming languages

  1. char[] alpha = {'A', 'B', 'C', 'D', 'E'};

  2. char[] alpha = {"A", "B", "C", "D", "E"};

  3. char[] alpha = new char('A', 'B', 'C', 'D', 'E');

  4. char[][] alpha = {{'A', 'B', 'C', 'D', 'E'}};

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Correct Option: A
Explanation:

To solve this question, the user needs to know how to declare and initialize an array in Java.

Option A is correct since it declares an array of characters and initializes it with the given values separated by commas within curly braces. This is the correct syntax for initializing a character array in Java.

Option B is incorrect because it uses double quotes (") instead of single quotes (') to initialize the characters. In Java, double quotes are used for Strings while single quotes are used for characters.

Option C is incorrect because the syntax for initializing an array using the "new" keyword is incorrect. The correct syntax is to use square brackets after the data type to specify the size of the array.

Option D is incorrect because it declares a two-dimensional array instead of a one-dimensional array. The inner curly braces are not needed since there is only one dimension.

Therefore, the correct answer is:

The Answer is: A. char[] alpha = {'A', 'B', 'C', 'D', 'E'};

Which range of values is valid for all integral types, where n is the number of bits?
technology programming languages

  1. 2^(n-1) to 2^(n+1)+1

  2. -2^(n-1) to 2^(n-1)-1

  3. -2^(n-1) to 2^(n-1)+1

  4. -2^(n-1) to 2^(n+1)-1

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Correct Option: B

Which lexical elements do you use to start and end a comment that you wish to include as part of documentation? Choose more than one option.
technology programming languages

  1. //

  2. /*

  3. /**

  4. */

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Correct Option: C,D

Assume you have created a piece of Java source code and compiled it successfully. How does the Java platform execute the code?
technology programming languages

  1. The compiler interprets the bytecode in the Java class file

  2. The Java Virtual Machine (JVM) interprets the bytecode in the Java class file

  3. The JVM interprets the native machine code

  4. The JVM translates compiled bytecode to machine code

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Correct Option: B,D

You are required to represent the employees at a company in Java code. The employees are categorized according to their position and salary. You also need to be able to change the state of an employee due to a promotion. How could you represent this?
technology programming languages

  1. Create a Salary object

  2. Declare an Employee class

  3. Declare an instance of the Employee class called Promotion

  4. Declare a promotion method that changes the value of the position variable

  5. Define variables for position and salary

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Correct Option: B,D

Which Java keywords do you use in conditional statements to control program flow? Choose more than one option.
technology programming languages

  1. catch

  2. else

  3. finally

  4. if

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Correct Option: B,D

Identify the type of the following comment: /* this method prints out all *the employee's information */ Choose an option.
technology programming languages

  1. Doc comment

  2. In-line comment

  3. Multi-line comment

  4. none

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Correct Option: C

What is the correct way to declare and initialize a string object, "start", whose value - "Welcome to Java Programming" - can be shared?
technology programming languages

  1. String start = new String("Welcome to Java Programming");

  2. String start[] = "Welcome to Java Programming";

  3. String start = "Welcome to Java Programming";

  4. none

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Correct Option: C

When do you need to use an array?
technology programming languages

  1. To create a mutable string

  2. To store a single character

  3. To store multiple items of the same type

  4. none

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Correct Option: C

Assume you create a Student class with the variables name, ID, and course. You then create a method called gradeStudent. If you create a subclass of the Student class called GraduateStudent, what does it inherit?
technology programming languages

  1. An instance of the Student class

  2. The course variable

  3. The gradeStudent method

  4. The ID variable

  5. The name variable

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Correct Option: B,C,D,E