Java Design Pattern Interview Question To Prepare For

Java Design Pattern Interview Question


The position involves the writing of complex code that is more knowledge-intensive than ordinary behavior or situation. It is not possible to know what exact question should we ask in your interview. Preparing your answer from common interview questions will help you answer your skills in the interview, which will give you more confidence and new response, and you will give the correct impact on your answer. In this article, there are very frequently asked questions regarding the pattern and design of Java coding, which may help you succeed in your interview. Let’s see some of the questions with some sample answers and the reason behind the question asked by the interviewer in the Java Design Pattern Interview.

Java Design Pattern Interview Questions

Consider some questions with sample answers.

  • Q1. What do you know about the design pattern?

This is a commonly asked question, and the interview asked you this question only as a warm-up. Your answer will indicate how much information and knowledge you have on a particular topic. Briefly define what you know on the topic and explain how the interview can understand.

Example of Answer: The pattern design, the extension used codes used in common software problem programs to solve it out, maybe repetitive code and coding everything from scratch and adding priorities to function. This particular time of pattern saves time by providing great effort to the employee. Movie dynamic or object-oriented programming allows users input to decide what the output is to be displayed.

  • Q2. Mention the different categories of design patterns? 

The reason behind this question is the interviewer wants to know more about the design pattern in depth from you regarding knowledge.

Example of Answer: There are three categories of design pattern such as:

  1. The creational pattern gives you the freedom to choose how to present the object while hiding the logic.
  2. The structural pattern lets you identify and simplify the relationship between the objects and give the object an additional function.
  3. Behavioral pattern- it gives you information about how the objects communicate with each other.
  • Q3. What are the advantages of design patterns in Java? 

Always be prepared for this important question, as this is considered an important question in the interview. Outline the answer by giving the interviewer information about how you have used and benefitted from this pattern.

Example of Answer: Design patterns provide important information which can be used in different projects as solutions. Even customizing and in multiple systems, this concept is very useful in defining the architecture, even though coding it repeatedly by Appreciating the thoroughness of the testing done to ensure that these extensions are reliable.

  • Q4. According to you describe a factory pattern?

The interviewer asked this question to let you know more in-depth about the design pattern in your mind by asking about some more common design patterns and offering you a bit of insight into your eyes for some more details.

Example of Answer: It is a container for creational logic, the factory pattern design to act as creational design. Suppose it is separated by a common code dependent on any specific class to make changes to the extension without affecting the main API. This pattern is highly used because it holds one of the best methods of creating the object and hiding the logic accessible in a shared interface.

  • Q5. Differentiate between abstract factory design pattern and factory? 

If you are able then you must answer this question in one sentence. If you Explain the difference then it will help your understanding of the design pattern.

Example of Answer: The price difference between these is: through inheritance, you can create a single object with the method of the factory pattern. While with the help of abstract factory patterns, you can create a factory pattern very effectively, reducing the family of related objects.

  • Q6. In what Order should you describe the design pattern in documentation? 

The interview will begin to do your interview by asking more complex questions and wanted to test your knowledge and wanted to see your work through the required questions to know the category and know your knowledge in order of documentation. 

Example of Answer: According to documentation the facets of the design pattern are as follows: 

  1. Naming and classification of patterns.
  2. The problem being addressed ( intent).
  3. How to solve problems (motivation).
  4. Proper application ( know the instance where the pattern is to be applied).
  5. Pattern structure (diagram of pattern).
  6. Participants (responsibilities according to class and object).
  7. Proper collaboration (to achieve the goal must know how participants will interact).
  8. Drawbacks (pattern trade-offs).
  9. Proper implementation (identification of issues with specific language).
  10. Sample (implementation of core instructing pattern).
  11. Their uses (identification of the ser in the real world).
  12. Patterns relation.
  • Q7. Give some of the advantages of a design pattern in your opinion? 

Uses of different dimensions and steps involved are based on the pattern. The interview is likely to ask questions on this basis. 

Example of Answer: According to my experience, the advantages to found a builder’s pattern can be encapsulated the construction and representation in which coding is in a separate container to enable the process of construction and produce multiple representations. And I also enjoy an improvement over control that gives me knowledge of creation by breaking the object into small components to make it less complex. It also helps to reduce the required parameter for increasingly and readability and builds the pattern quickly by allowing immutable objects.

  • Q8. How is the adaptor pattern different from the bridge pattern? 

Now here interview wants to see your knowledge. This question requires a profound understanding. An interviewer is eager to see your fitness by your answer, both accurate and easy to follow. You can support your answer by giving examples also.

Example of Answer: The adaptor pattern and bridge pattern are quite similar. Both adaptor pattern and bridge pattern are considered a form of encapsulation and provide more facility over code changing without an impacting class structure. One important difference between the two is the adaptor pattern provides an incompatible class of interface. In contrast, the bridge pattern separates essential data from its implementation without changing the source of code. For example, the slot of the memory card in the computer is the after, which allows the interface of the memory card with the computer. A household light is an example that presents a bridge pattern. The switch of the device can be in the form of a chain, it may be at two position dimmer or a switch. Turning on and off of light is the task performed, which makes you the best bridge pattern. 

  • Q9. Explain a singleton pattern that explains the advantages and disadvantages according to you?

Now the interviewer wants to see how you manage the pressure of the question and also wants to see some negatives in your answer.

Example of Answer: For the restriction of instance, Singleton pattern is creational to class to just one single instance coordinate the action across the whole system. For every request, it can be used over and over without the need for recreation. This is what advantages the singleton pattern. It is associated without affecting anything, and the code becomes so tightly contracted that you can not change it without affecting everything. It can easily be broken, and it does not support inheritance.

  • Q10. What do you think is a prototype pattern that is better than creating another instance by using a new keyword? If yes, why?

If you represent a good answer in front of the interviewer, the presentation will match their preference. Then you will also find someone who will voice an opinion when it is appropriate.

Example of Answer: When these circumstances occur, such as performance limitation or space, the creation of objects is so bulky, requiring an excessive amount of resources to create a whole new instance for effective performance. In such cases, if using the prototype pattern can provide more efficiency by cloning the same object. In this case, yes, the prototype pattern will work ok very advantages.

Way forward: 

When you are preparing for the job interview, you must go through the job description required competency and consider what factors entail some technical knowledge. Your interviewer is likely to ask some technical and complex questions, but you must identify some of the questions and practice. You can prepare for the interview and cancel yourself from awkward silence during the interview. During each stage after hiring, the process will show you how grateful you are and excited about the position. You can enhance your skills over interviews by practicing more sample questions and get a chance to hold the position you are trying for. 

Also read Java Architects Interview Questions with Sample Answers

Java Design Pattern Interview Question To Prepare For

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