Java Software Developer Interview Questions and Answers for Freshers

Polymorphism is the ability of a single function or method to operate on different data types. Types include compile-time and runtime polymorphism.

• Polymorphism allows a single function to work with different data types.

• Compile-time polymorphism is achieved through method overloading.

• Runtime polymorphism is achieved through method overriding.

• Example: Overloading a method with different parameter types.

• Example: Overriding a method in a subclass to provide specific implementatio...read more

I am passionate about programming and Java is a versatile language with a wide range of applications.

• Java is widely used in the industry and has a strong community support.

• Java is platform-independent and can be used to develop applications for various devices.

• Java has a rich set of libraries and frameworks that make development faster and easier.

• Java is used in a variety of domains such as web development, mobile app development, and enterprise software development.

• I have ex...read more

Java exception handling is a mechanism to handle runtime errors and prevent program termination.

• Exceptions are objects that are thrown at runtime when an error occurs

• try-catch blocks are used to handle exceptions

• finally block is used to execute code regardless of whether an exception is thrown or not

• Exception hierarchy includes checked and unchecked exceptions

• Examples of exceptions include NullPointerException, ArrayIndexOutOfBoundsException, and FileNotFoundException

Object-oriented programming concepts in Java

• Encapsulation: bundling data and methods together

• Inheritance: creating new classes from existing ones

• Polymorphism: using a single interface to represent different types

• Abstraction: hiding implementation details and providing a simplified view

• Encapsulation: grouping related data and methods into objects