Lighthouse Info Systems Java Developer Interview Questions and Answers for Freshers

Java is a high-level programming language known for its platform independence and object-oriented approach.

• Java is widely used for developing desktop, web, and mobile applications.

• It is known for its write once, run anywhere (WORA) capability.

• Java uses a virtual machine (JVM) to execute code, providing portability across different operating systems.

• It supports multithreading, exception handling, and dynamic memory allo...read more

Inheritance is a mechanism in object-oriented programming where a new class is created from an existing class.

• Allows for code reuse and promotes code organization

• The new class (subclass) inherits properties and methods from the existing class (superclass)

• Subclass can add new properties and methods or override existing ones

• Example: A Car class can inherit properties and methods from a Vehicle class

A program to calculate the sum of numbers.

• Create a variable to store the sum.

• Iterate through the numbers and add each number to the sum.

• Return the sum.

Java is a high-level, object-oriented programming language used to develop applications for various platforms.

• Java is platform-independent and can run on any device with a Java Virtual Machine (JVM)

• It is known for its security features and is commonly used for developing web applications, mobile apps, and enterprise software

• Java code is compiled into bytecode, which can be executed on any platform that has a JVM instal...read more

Java is a versatile, platform-independent language with a vast community and extensive libraries.

• Java is object-oriented and easy to learn.

• It has a vast community and extensive libraries.

• It is platform-independent and can run on any device.

• Java is secure and reliable.

• It is used in various domains like web development, mobile app development, and enterprise applications.

• Examples: Android apps, Spring framework, Hadoop,

String is a class in Java used to represent a sequence of characters.

• Strings are immutable in Java

• String objects can be created using string literals or the new keyword

• String class provides various methods for manipulating strings such as substring, replace, etc.