Hexaware Technologies Interview Questions and Answers

The statement to use for selecting based on integer inputs is the 'switch' statement.

• The 'switch' statement allows for multiple cases to be evaluated based on the value of an integer input.

• Each case represents a possible value of the input, and the corresponding code block is executed if the value matches.

• The 'switch' statement also provides a 'default' case which is executed if none of the cases match the input value.

• Here's an example: int input = 2; switch (input) { case 1:...read more

The HashMap class is used to represent key-value pairs in Java.

• HashMap is a part of the Java Collections Framework.

• It allows null values and only one null key.

• It provides constant-time performance for basic operations like get and put.

• Example: HashMap<String, Integer> map = new HashMap<>();

Exception handling, stored procedures, indexing, and OOP concepts are important in software engineering.

• Exception handling is the process of handling errors that occur during program execution.

• Stored procedures are pre-written SQL code that can be executed with a single command.

• Indexing is the process of optimizing database performance by creating indexes on frequently queried columns.

• OOP concepts include encapsulation, inheritance, and polymorphism.

try-catch is used in Java to handle exceptions and prevent program crashes.

• try-catch blocks are used to catch and handle exceptions that may occur during program execution.

• It allows the program to gracefully handle errors and prevent the program from crashing.

• The try block contains the code that may throw an exception, and the catch block handles the exception.

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

• The finally block can be used to execute co...read more

Abstraction is the process of simplifying complex systems by focusing on essential details and hiding unnecessary complexities.

• Abstraction allows us to create models or representations of real-world objects or systems in software.

• It helps in managing complexity by breaking down a system into smaller, more manageable parts.

• Abstraction provides a level of indirection, allowing changes to be made in one part of the system without affecting other parts.

• It promotes code reusabilit...read more

Abstraction is a concept of hiding implementation details while interface is a contract that defines the behavior of a class.

• Abstraction is achieved through abstract classes and methods

• Interface is a collection of abstract methods

• Abstraction is used for reducing complexity and increasing efficiency

• Interface is used for achieving multiple inheritance and loose coupling

• Abstraction is a way of achieving data abstraction while interface is a way of achieving abstraction in behavi...read more