Intellect Design Arena System Engineer Interview Questions and Answers

Simple aptitude questions focing on english

Q1. All java basic and advanced questions
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Q2. Remove duplicatefrom string
Ans. 
Use a set to remove duplicates from a string
• Create a set to store unique characters

• Iterate through the string and add each character to the set

• Convert the set back to a string to get the result
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Q3. Write star pattern
Ans. 
Print a star pattern using loops
• Use nested loops to print the desired pattern

• Start with a small pattern and then increase complexity

• Use '*' character to represent the stars

• Example: For a simple pattern, you can use a loop to print '*' in a single line
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Q4. Find length of string they give string
Ans. 
Use the length() function to find the length of the given string.
• Use the length() function in programming languages like Java, Python, C++, etc.

• For example, in Java: String str = 'hello'; int length = str.length();

• Make sure to handle edge cases like empty strings or null values.
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Q5. Replace characters from string
Ans. 
Replace characters from string with another character
• Use a loop to iterate through each character in the string

• Check if the character needs to be replaced and replace it with the desired character

• Return the modified string
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Q1. Prime number using any popular language
Ans. 
A prime number is a number greater than 1 that can only be divided by 1 and itself.
• Use a loop to check if the number is divisible by any number other than 1 and itself

• Start checking from 2 up to the square root of the number for efficiency

• If the number is only divisible by 1 and itself, it is a prime number
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Q2. Reverse string using any popular language
Ans. 
Reverse a string using popular programming languages
• Use built-in functions like reverse() in Python

• Iterate through the string in reverse order in C++

• Use StringBuilder.reverse() in Java
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Prepared jeneral Aptitude

Technical and coding questions

Round duration - 30 minutes
Round difficulty - Easy

Technical round with questions based on core Java concepts.

Q1. Can we use a static method in an interface?
Ans. 
Yes, static methods can be used in interfaces in Java.
• Static methods in interfaces were introduced in Java 8.

• Static methods can be called using the interface name.

• Static methods in interfaces are used for providing utility methods.

• Example: interface MyInterface { static void myMethod() { System.out.println("Static method in interface"); }}
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Q2. How can we achieve polymorphism in Java?
Ans. 
Polymorphism in Java can be achieved through method overloading and method overriding.
• Method overloading: Having multiple methods in the same class with the same name but different parameters.

• Method overriding: Subclass provides a specific implementation of a method that is already provided by its superclass.

• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• Example: Animal...read more
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Q3. What is the difference between an abstract class and an interface in Java?
Ans. 
Abstract class can have both abstract and non-abstract methods, while interface can only have abstract methods.
• Abstract class can have constructors, member variables, and methods with implementation.

• Interface can only have abstract methods and constants.

• A class can implement multiple interfaces but can only extend one abstract class.

• Example: abstract class Animal { abstract void sound(); void eat() { // implementation ...read more
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