08. Static and Default Methods - Java 8 Interview Questions

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In this playlist I will try to cover all the important java interview questions along with answers in very intuitive, kind of pictorial/animated way.

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In this series we will be covering all Java interview questions and answers. This is going to be comprehensive list of Java interview questions which can help experienced Java developers to prepare for an interview as well as upskilling the Java knowledge.

I would always recommend everyone to watch Durga Sir (durgasoft) videos because of extensive in depth explaination on all topics if you have more time.
But here we will try to cover important aspects of Java Programming which are always asked in interviews withing less time.

Java 8 introduced two new types of methods - Static Methods and Default Methods. These methods have become increasingly popular with Java developers due to their versatility and ability to simplify code.

Static Methods are methods that belong to a class rather than an instance of that class. This means that you can call a Static Method directly on the class, without needing to create an object first. Static Methods are often used for utility classes or helper methods that do not depend on the state of an object. They can also be used to improve performance by avoiding unnecessary object creation.

To declare a Static Method, you use the keyword 'static' before the method signature. By doing this, you are telling the compiler that this method belongs to the class, rather than to an instance of the class.

Default Methods are methods that have an implementation in the interface itself. Before Java 8, interfaces could only declare method signatures, but not provide an implementation. This meant that if a new method was added to an interface, all the classes implementing that interface would have to provide an implementation for that method, which could be a lot of work. With Default Methods, you can provide a default implementation for a method in the interface itself, which can be used by all the implementing classes. This way, you can add new methods to an interface without breaking existing code.

To declare a Default Method, you use the keyword 'default' before the method signature. This tells the compiler that this method has a default implementation in the interface itself. Default Methods are very useful when you want to extend an interface with a new method, but do not want to break any existing code that may implement that interface.

In summary, Static and Default Methods are two powerful features introduced in Java 8. Static Methods are methods that belong to a class rather than an instance of that class, and are often used for utility classes or helper methods that do not depend on the state of an object. Default Methods are methods that have an implementation in the interface itself, and are very useful when you want to extend an interface with a new method, but do not want to break any existing code that may implement that interface. Both Static and Default Methods have become essential tools for Java developers, helping them to write more efficient, elegant and maintainable code.

Kywords:
Java 8, Methods, Static Methods, Default Methods, Utility Classes, Helper Methods, Object-Oriented Programming, Programming Paradigm, Interface, Method Signatures, Implementation, Extensibility, Inheritance, Code Reusability, Polymorphism, Performance Optimization, Memory Management, Interface Segregation Principle, Java Development Kit (JDK), Object Creation, Technical Interviews, Method Overloading, Method Overriding, Access Modifiers, Compilation, Code Maintenance, Version Control, Software Development, Abstraction, Encapsulation, Default Implementations, Interface Evolution, Backward Compatibility, Functional Interfaces, Lambda Expressions, Stream API, Optional Class, Collections API, Data Structures, Algorithms, Control Flow Statements, Looping, Conditional Statements, Error Handling, Exception Handling, Debugging, Automated Testing, Unit Testing, Integration Testing, Code Coverage#interviewquestions#java