Maventic Innovative Solutions Developer Interview Questions and Answers

Good it was pretty straightforward

Two basic DSA were asked

It was a coding test of 30 minutes, and we were asked to do a basic code in java/C++. Anyone with a sane programming knowledge can easily do it.

Q1. Types of Constructors
Ans. 
Types of Constructors
• Default constructor: No arguments, initializes object with default values

• Parameterized constructor: Takes arguments and initializes object with provided values

• Copy constructor: Creates a new object by copying the values of an existing object

• Static constructor: Initializes static members of a class

• Private constructor: Restricts the creation of objects from outside the class
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Q2. Can 'this' keyword be equal to null?
Ans. 
No, the 'this' keyword cannot be equal to null.
• The 'this' keyword refers to the current instance of a class.

• It is used to access the members of the current object.

• Since 'this' refers to an object, it cannot be null.
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Q3. Can static and public be interchanged ?
Ans. 
No, static and public cannot be interchanged.
• Static and public are two different keywords in programming.

• Static is used to define a variable or method that belongs to the class itself, rather than an instance of the class.

• Public is an access modifier that allows the variable or method to be accessed from anywhere in the program.

• Interchanging static and public would result in a syntax error.

• For example, in Java, the fol...read more
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Q4. Question regarding packages and how to import them from different directories.
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Q5. I was asked to do a program on Strings.
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Q1. Why constructor overriding is not allowed in java?
Ans. 
Constructor overriding is not allowed in Java to maintain the integrity of the object creation process.
• Constructor is used to initialize the object state, and allowing overriding can lead to unexpected behavior.

• Inheritance allows the subclass to inherit the superclass constructor, but not override it.

• If a subclass needs to modify the behavior of the superclass constructor, it can use constructor chaining or call a sepa...read more
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Q2. Why is normalization used and what is 3NF with example?
Ans. 
Normalization is used to eliminate data redundancy and improve data integrity. 3NF ensures that each attribute is dependent on the primary key.
• Normalization helps in organizing data in a structured manner

• It eliminates data redundancy and inconsistencies

• 3NF ensures that each attribute is dependent on the primary key

• For example, a table with columns like Order ID, Product ID, and Customer ID can be normalized to eliminat...read more
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Q3. What is inheritance with code. Difference between overloading and overriding.
Ans. 
Inheritance is a mechanism in OOP where a new class is derived from an existing class. Overloading is having multiple methods with the same name but different parameters. Overriding is having a method in the subclass with the same name and parameters as in the superclass.
• Inheritance allows for code reuse and promotes code organization.

• Overloading is used to have multiple methods with the same name but different paramet...read more
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Q4. Was asked to do a code on sub sequences. (This coding section was a little hard)
Ans. 
Subsequences are derived from a sequence by deleting some elements without changing the order of the remaining elements.
• A subsequence can be formed by deleting zero or more elements. Example: From 'abc', subsequences include '', 'a', 'b', 'c', 'ab', 'ac', 'bc', 'abc'.

• The number of subsequences of a string of length n is 2^n. For 'abc' (n=3), there are 2^3 = 8 subsequences.

• Subsequences differ from substrings; substrings...read more
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