Intellect Design Arena System Trainee Interview Questions and Answers

Polymorphism is the ability of an object to take on multiple forms.

• Polymorphism allows objects of different classes to be treated as if they are of the same class.

• It can be achieved through method overloading or method overriding.

• Example: A parent class Animal can have multiple child classes like Dog, Cat, etc. and all of them can have their own implementation of the same method like makeSound().

• Polymorphism helps...read more

Program to find min and max in an array of strings

• Convert array elements to integers

• Initialize min and max variables

• Loop through array and compare values

• Return min and max values

Program to reverse a string

• Declare a string variable

• Loop through the string from end to start

• Append each character to a new string variable

• Return the new string variable

Exception handling in Java is a mechanism to handle runtime errors and prevent program termination.

• Java provides try-catch blocks to handle exceptions

• Multiple catch blocks can be used to handle different types of exceptions

• Finally block is used to execute code regardless of whether an exception is thrown or not

• Custom exceptions can be created by extending the Exception class

• Checked exceptions must be handled or de...read more

Yes, static methods can be used in an interface.

• Static methods in an interface can be used to provide utility methods that are not tied to any specific instance of the interface.

• These methods can be called directly on the interface itself, without the need for an instance of a class that implements the interface.

• Static methods in an interface cannot be overridden by implementing classes.

• They can be useful for prov...read more

Abstract classes are classes that cannot be instantiated and can have both concrete and abstract methods. Interfaces are contracts that define a set of methods that a class must implement.

• Abstract classes can have instance variables, constructors, and non-abstract methods, while interfaces cannot.

• A class can implement multiple interfaces, but it can only inherit from one abstract class.

• Abstract classes provide a w...read more

Polymorphism in Java can be achieved through method overriding and method overloading.

• Method overriding allows a subclass to provide a different implementation of a method that is already defined in its superclass.

• Method overloading allows multiple methods with the same name but different parameters to be defined in a class.

• Polymorphism allows objects of different classes to be treated as objects of a common super...read more

C is a procedural language while Java is an object-oriented language.

• C is compiled while Java is interpreted

• Java has automatic garbage collection while C requires manual memory management

• Java has platform independence while C is platform dependent

• Java has built-in exception handling while C does not

• Java has a larger standard library than C