10+ EGC Global Services Interview Questions and Answers

Java is platform independent because it uses the concept of bytecode and virtual machine.

• Java code is compiled into bytecode, which is a platform-independent representation of the code.

• The bytecode is then executed by the Java Virtual Machine (JVM), which is specific to each platform.

• This allows Java programs to run on any platform that has a compatible JVM.

• The JVM acts as an interpreter, translating the bytecode into machine code that can be executed by the underlying hardwa...read more

The fundamental pillars of OOPS programming are encapsulation, inheritance, and polymorphism.

• Encapsulation: It is the process of hiding the internal details of an object and providing a public interface for interacting with it.

• Inheritance: It allows creating new classes by inheriting properties and behaviors from existing classes, promoting code reuse.

• Polymorphism: It enables objects of different classes to be treated as objects of a common superclass, providing flexibility a...read more

Sort a list of custom class objects based on one of its properties.

• Use a sorting algorithm like bubble sort, insertion sort, or merge sort.

• Implement a comparison function to compare the desired property of the objects.

• Apply the sorting algorithm to the list of objects using the comparison function.

A SQL query to count the number of rows in a table.

• Use the COUNT() function in SQL to count the number of rows in a table.

• Specify the table name in the FROM clause.

• Use the result of the COUNT() function to print the number of rows.

Exception handling is a mechanism to handle runtime errors and prevent program crashes.

• Exception handling is used to catch and handle errors that occur during program execution.

• It involves the use of try-catch blocks to catch exceptions and handle them gracefully.

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

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

• Finally block can be used to execute ...read more

i++ and ++i are both increment operators in C++ but have different behaviors.

• i++ is a post-increment operator which increments the value of i after using it in an expression.

• ++i is a pre-increment operator which increments the value of i before using it in an expression.

• Example: int i = 5; int a = i++; // a = 5, i = 6; int b = ++i; // b = 7, i = 7;