Plintron Global Technology Solutions Software Developer Trainee Interview Questions and Answers

Aptitude+Logical Reasoning+Puzzles

Required to write 2 programs in the language one is comfortable with.

Q1. What is a constructor?
Ans. 
A constructor is a special method that is used to initialize objects of a class.
• Constructors have the same name as the class they belong to.

• They are called automatically when an object is created.

• They can take parameters to set initial values for object properties.

• If a class does not have a constructor, a default constructor is created automatically.
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Q2. What is a variable/ static variable?
Ans. 
A variable is a named storage location in memory that holds a value. A static variable is a variable that retains its value between function calls.
• Variables are used to store data in a program

• They can be of different data types such as int, float, char, etc.

• Static variables are declared with the static keyword and retain their value between function calls

• They are useful for maintaining state across function calls
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Q3. Can you declare constructor privately? If so, what are the ways to access it from outside its class?
Ans. 
Yes, a constructor can be declared privately.
• Private constructors are used to prevent the creation of objects of a class from outside the class itself.

• To access a private constructor from outside its class, we can use a public static method or a factory method.

• The public static method or factory method can create an instance of the class by calling the private constructor.
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Q4. What is a class? And how can a class access another class?
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A class is a blueprint for creating objects that have properties and methods. One class can access another class using inheritance or composition.
• A class is a user-defined data type that encapsulates data and functions.

• Classes can have access modifiers like public, private, and protected.

• Inheritance allows a class to inherit properties and methods from another class.

• Composition allows a class to use objects of another ...read more
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Q1. Why did you choose to study what you studied?
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Q2. Write Fibonacci program
Ans. 
Fibonacci program generates a series of numbers where each number is the sum of the two preceding ones.
• Declare variables for first and second numbers in the series

• Use a loop to generate subsequent numbers by adding the previous two

• Print or store the numbers in an array
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Q3. Write reverse string manipulation without using the predefined methods.
Ans. 
Reverse a string without using predefined methods.
• Create an empty string to store the reversed string.

• Loop through the original string from the end to the beginning.

• Add each character to the empty string.

• Return the reversed string.
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Q4. 3l Jar and 5l Jar puzzle.
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