Infosys Java Programmer Interview Questions and Answers

JRE stands for Java Runtime Environment.

• JRE is a software package that provides the necessary runtime environment for Java applications to run.

• It includes the Java Virtual Machine (JVM), class libraries, and other supporting files.

• JRE is required to run Java applications on a computer.

• Examples of Java applications that require JRE include Eclipse, NetBeans, and Minecraft.

James Gosling is considered the father of Java programming language.

• James Gosling is a Canadian computer scientist who created the Java programming language.

• He developed Java while working at Sun Microsystems in the mid-1990s.

• Java was initially designed for interactive television, but it quickly gained popularity for its platform independence and object-oriented features.

• Gosling's team also developed the original Java ...read more

Java programming uses object-oriented programming principles and a robust set of libraries and frameworks.

• Java uses object-oriented programming principles such as encapsulation, inheritance, and polymorphism.

• Java has a rich set of libraries and frameworks for various purposes like GUI development, networking, database connectivity, etc.

• Java supports multithreading, exception handling, and dynamic memory allocation.

• Java...read more

Java Program is a set of instructions written in the Java programming language that can be executed by a computer.

• Java Program is a collection of classes and methods that define the behavior of a software application.

• It is written in the Java programming language and can be executed on any platform that has a Java Virtual Machine (JVM).

• Java Programs are compiled into bytecode, which is then interpreted and executed by ...read more

An object is a fundamental concept in object-oriented programming, representing a real-world entity with its own state and behavior.

• An object is an instance of a class.

• It encapsulates data and methods.

• Objects can interact with each other through method calls.

• Example: A car object can have properties like color and speed, and methods like start() and stop().

A class is a blueprint for creating objects in object-oriented programming.

• A class is a template that defines the properties and behaviors of objects.

• It encapsulates data and methods that operate on that data.

• Objects are instances of a class.

• Classes can inherit properties and behaviors from other classes through inheritance.

• Example: class Car { String color; void start() { ... } }