Placements Interview Questions and Answers

Array is a collection of similar data types. Constructor is a special method used to initialize objects. Class is a blueprint while object is an instance of a class.

• Array is used to store multiple values in a single variable.

• Constructor is called when an object of a class is created.

• Class defines the properties and methods of an object while object is an instance of a class.

• Example of array: int[] numbers = {1, 2, 3};

• Example of constructor: public class Car { public Car() { /...read more

C is a procedural language, C++ is an object-oriented language, and Java is a class-based object-oriented language.

• C is a low-level language with limited abstraction and no built-in support for object-oriented programming.

• C++ is an extension of C with added support for object-oriented programming, templates, and exception handling.

• Java is a high-level language with automatic memory management, platform independence, and a large standard library.

• C and C++ are compiled language...read more

JVM is a virtual machine that executes Java bytecode. JDK is a development kit that includes JRE and tools for developing Java applications. JRE is a runtime environment that executes Java bytecode.

• JVM stands for Java Virtual Machine and is responsible for executing Java bytecode.

• JDK stands for Java Development Kit and includes JRE along with tools for developing Java applications.

• JRE stands for Java Runtime Environment and provides a runtime environment for executing Java by...read more

Static memory allocation is a way of allocating memory at compile-time.

• Memory is allocated before the program starts executing

• The size of memory is fixed and cannot be changed during runtime

• Variables declared with static keyword are stored in static memory

• Example: int x; //allocated in static memory

• Example: static int y; //allocated in static memory