Interview Questions and Answers for 'Design' | Search Interview Question

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Q101. What could be the driving force to have dependencies injected through class than through config file while using IOC or Dependency Injection ?

Design

Ans. Unit Testing

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Q102. Design a Database Schema to store Employee Information with each employee having multiple addresses.

Database

Ans. We can have 2 entities i.e EMPLOYEE and ADDRESS and can have a relationship Table , EMPLOYEE_ADDRESS having one to may relationship between the two.

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Q103. What is monkey patching ?

Design

Ans. The term monkey patch only refers to dynamic modifications of a class or module at runtime, motivated by the intent to patch existing third-party code as a workaround to a bug or feature which does not act as desired.

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Q104. Can you explain software design principles cohesion and coupling with an example?

Design

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Q105. In singleton Pattern framework, Web application deployed on multiple cluster server will have how many objects?

Design

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Q106. In a file there are 1 million words . Find 10 most frequent words in that file.

Design

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Q107. How one dao Implementation object (singleton) can handle multiple requests?

Design Pattern

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Q108. Explain Facade design pattern

Design

Ans. Single gateway of the entire application is called Facade Design Pattern.

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Q109. Write code for serialization.

Core Java

Ans. // Java code for serialization and deserialization
// of a Java object
import java.io.*;

class Demo implements java.io.Serializable
{
   public int a;
   public String b;

   // Default constructor
   public Demo(int a, String b)
   {
      this.a = a;
      this.b = b;
   }

}

class Test
{
   public static void main(String[] args)
   {
      Demo object = new Demo(1, "geeksforgeeks");
      String filename = "file.ser";

      // Serialization
      try
      {
         //Saving of object in a file
         FileOutputStream file = new FileOutputStream(filename);
         ObjectOutputStream out = new ObjectOutputStream(file);

         // Method for serialization of object
         out.writeObject(object);

         out.close();
         file.close();

         System.out.println("Object has been serialized");

      }

      catch(IOException ex)
      {
         System.out.println("IOException is caught");
      }

      Demo object1 = null;

      // Deserialization
      try
      {
         // Reading the object from a file
         FileInputStream file = new FileInputStream(filename);
         ObjectInputStream in = new ObjectInputStream(file);

         // Method for deserialization of object
         object1 = (Demo)in.readObject();

         in.close();
         file.close();

         System.out.println("Object has been deserialized ");
         System.out.println("a = " object1.a);
         System.out.println("b = " object1.b);
      }

      catch(IOException ex)
      {
         System.out.println("IOException is caught");
      }

      catch(ClassNotFoundException ex)
      {
         System.out.println("ClassNotFoundException is caught");
      }

   }
}

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Q110. Explain flow of MVC

Design

Ans. It is an architectural pattern that separates an application into three main logical components: the model, the view, and the controller. Each of these components are built to handle specific development aspects of an application

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Q111. Design an inventory management system.

Design

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Q112. What is micro-benchmarking in Java?

Design

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Q113. Can you write critical section code for singleton design pattern ?

Design

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Q114. Design ATM machine application using oops.

Design

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Q115. If you are given a choice to decide a Programming language for an application , what factors would you think of before deciding on the language to build it ?

Design

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Q116. What is the programming advantage of Immutability ?

Design

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Q117. What are the disadvantages of immutability ?

Design

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Q118. What are the ways to break singleton pattern ?

Design

Ans. If we don't have double checked locking, it can be broken easily through multi threaded access.

Through Reflection.

If multiple class loaders are loading the class.

If the class is serializable or cloneable.

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Q119. Why the singleton class should never implement Cloneable interface ?

Design

Ans. Because Singleton implementation doesn't restrict it from cloning and hence we can have multiple objects when we actually don't intend it to have multiple objects.

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Q120. How serialization breaks Singleton pattern ?

Design

Ans. It's not serialization but de serialization that breaks purpose of singleton as new objects can be brought to life using the serialized object.

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Q121. How Reflection can break any design pattern ?

Design

Ans. Using java reflection api, we can tweak into a class and modify it's runtime behavior and hence modify the pattern it might be using.

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Q122. Can we build an application that where few functions gets executed as a cron as well as services. How ?

Design

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Q123. How can we make sure that only one object of a class get's created ?

Design

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Q124. Do you think we should have security Tokens in Url ?

Design

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Q125. What information should be sent in url vs sent within the body in case of Post request ?

Design

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Q126. Given the Phone keys mapping between numbers and characters as following

1 - a,b,c
2 - d,e,f

and so on, Write a Program that takes the integer as input and then print all possible combinations of characters matching those integers.

For example - 12 should return

ad,ae,af,bd,be,bf,cd,ce,cf

Design

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Q127. Given a comma separated string that signifies the current position in 4 * 4 tic tac toes game, write a program that gives the result of the game - If anyone win and if yes then who and if the game is still open.

For example - x,0,x,x,x,0,0,0,0,x,0,x means that 00 index has x, 01 has 0 and so on with x(3,3) has last element x

Design

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Q128. Does it make sense to send someone's social security number as path parm in a get request ?

Design

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Q129. What is meant by Loosely coupled database design ?

Design

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Q130. Write code to reverse a C-Style String

Design

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