What's the difference between the Dependency Injection and Service Locator patterns?
- The Dependency Injection pattern involves a central registry that provides objects when requested, while the Service Locator pattern involves passing objects as dependencies to the objects that require them.
- The Dependency Injection pattern involves creating and configuring objects, while the Service Locator pattern involves finding and returning objects.
- The Dependency Injection pattern involves finding and returning objects, while the Service Locator pattern involves creating and configuring objects.
- The Dependency Injection pattern involves passing objects as dependencies to the objects that require them, while the Service Locator pattern involves a central registry that provides objects when requested.
The Dependency Injection pattern involves passing objects as dependencies to the objects that require them, while the Service Locator pattern involves a central registry that provides objects when requested. The Dependency Injection pattern provides objects to its client as they are needed, while the Service Locator pattern allows objects to request objects they need from a centralized registry.
What is the difference between Façade and Mediator?
- Façade and Mediator are the same thing.
- Façade and Mediator have no relationship to each other.
- Façade is a pattern for communication between components of a system, while Mediator is a simplified interface to a complex system. Façade is a two-way communication pattern, while Mediator is a one-way communication pattern.
- Façade is a simplified interface to a complex system, while Mediator is a pattern for communication between components of a system. Façade is a one-way communication pattern, while Mediator is a two-way communication pattern.
The Façade pattern provides a simplified interface to a complex system, while the Mediator pattern provides a way for components of a system to communicate with each other in a loosely coupled manner. Façade is a one-way communication pattern, while Mediator is a two-way communication pattern.
What is the purpose of the Facade pattern?
- To allow multiple objects to communicate with each other
- To create a reusable object-oriented design
- To provide a common interface for a group of related classes
- To provide a simplified interface to a complex system, hiding the complexity of the system behind a single interface and making it easier to use
The Facade pattern provides a simplified interface to a complex system, hiding the complexity of the system behind a single interface and making it easier to use
What is relationship between Repository and Unit of Work?
- The Repository and Unit of Work patterns are interchangeable, as they both provide similar functionality and can be used interchangeably in a project.
- The Repository and Unit of Work patterns are not related, as they are completely separate design patterns with different purposes.
- The Repository and Unit of Work patterns are related, as the Unit of Work is responsible for managing the persistence of data changes, while the Repository provides an abstraction over the data access layer. The Repository can use the Unit of Work to persist changes to the data.
- The Repository and Unit of Work patterns are the same, as they are both used to manage the persistence of data changes.
The Repository and Unit of Work patterns are related, as the Unit of Work is responsible for managing the persistence of data changes, while the Repository provides an abstraction over the data access layer. The Repository can use the Unit of Work to persist changes to the data.
What is Design Patterns and why anyone should use them?
- A collection of best practices for software development that are specific to a certain programming language or framework.
- A pre-written solution to common software problems that can be adapted to fit the specific needs of a project. Design patterns provide a common vocabulary and shared understanding among team members, allowing for more efficient and maintainable code.
- A set of coding conventions that must be followed when developing software to ensure consistency and readability.
- A set of guidelines for designing user interfaces in a way that is aesthetically pleasing and easy to use.
Design Patterns are reusable solutions to common problems that arise in software development. They provide a standardized way of approaching these problems, which can improve the efficiency, maintainability, and understandability of the code.
What is Observer pattern?
- A design pattern in which an object, called the composite, is composed of one-to-many other objects, in a tree-like structure, allowing the client to interact with individual objects and compositions of objects uniformly
- A design pattern in which an object, called the decorator, adds or overrides behavior of an existing object, dynamically
- A design pattern in which an object, called the proxy, acts as an intermediary between a client and a target object, forwarding requests from the client to the target object and vice versa
- A design pattern in which an object, called the subject, maintains a list of its dependents and notifies them automatically of any changes to its state
The Observer pattern is a design pattern in which an object, called the subject, maintains a list of its dependents and notifies them automatically of any changes to its state. The Observer pattern is used to implement a publish/subscribe mechanism, allowing the subject to be decoupled from its dependents, and allowing multiple dependents to be notified of changes to the subject's state. The Observer pattern is used to implement event-driven systems.
What are the differences between a static class and a singleton class?
- A singleton class can be extended, while a static class cannot be extended
- A singleton class can have multiple instances, while a static class can only have one instance
- A static class can be extended, while a singleton class cannot be extended
- A static class can have multiple instances, while a singleton class can only have one instance
A static class can have multiple instances, while a singleton class can only have one instance. A static class is a class that is declared as static and can only access static variables and methods. A singleton class is a class that ensures that only one instance of the class exists in the JVM.
What is the difference between the Decorator and Flyweight patterns?
- The Decorator pattern is used to dynamically add or override behavior of an object, while the Flyweight pattern is used to reduce the number of objects created by sharing objects that are costly to create.
- The Decorator pattern is used to dynamically add or override behavior of an object, while the Flyweight pattern is used to share objects that are costly to create.
- The Decorator pattern is used to reduce the number of objects created by sharing objects that are costly to create, while the Flyweight pattern is used to dynamically add or override behavior of an object.
- The Decorator pattern is used to share objects that are costly to create, while the Flyweight pattern is used to dynamically add or override behavior of an object.
The Decorator pattern is used to dynamically add or override behavior of an object, while the Flyweight pattern is used to share objects that are costly to create.
What is the purpose of the Decorator design pattern?
- To attach additional responsibilities to an object dynamically.
- To create objects that are interchangeable with their base classes.
- To ensure that a class has only one instance and provide a global point of access to that instance.
- To manage the flow of control between objects in a complex system.
The Decorator design pattern is used to attach additional responsibilities to an object dynamically. This allows for greater flexibility and modularity in the design of a system, as well as the ability to add or remove responsibilities as needed.
What does program to interfaces, not implementations mean?
- This means that when designing software, the focus should be on defining the behavior of the components, rather than the specific implementations of those components.
- This means that when designing software, the focus should be on defining the data structures and algorithms used by the components, rather than the specific implementations of those components.
- This means that when designing software, the focus should be on defining the input and output of the components, rather than the specific implementations of those components.
- This means that when designing software, the focus should be on defining the interfaces between different components, rather than the specific implementations of those components. This makes the code more flexible and easier to maintain, as it reduces the amount of coupling between components.
This means that when designing software, the focus should be on defining the interfaces between different components, rather than the specific implementations of those components. This makes the code more flexible and easier to maintain, as it reduces the amount of coupling between components.