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Q61. Given a list of People, We need to distribute their gifts in such a way that

Any Person shouldn't get it's gift back
If A's gift goes to B, B's gift shouldn't go to A

Write a method that returns a Map where Key is the Person's name and value is the name of person whose gift was exchanged.

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Q62. Write a method that takes a string as input and identifies if any permutation of the String is Palindrome ? For example - ttoobb has a permutation 'bottob' which is a palindrome.

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Q63. Write code to reverse a C-Style String

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Q64. What is meant by Loosely coupled database design ?

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Q65. Does it make sense to send someone's social security number as path parm in a get request ?

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Q66. 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

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Q67. 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

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Q68. What information should be sent in url vs sent within the body in case of Post request ?

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Q69. Do you think we should have security Tokens in Url ?

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Q70. How can we make sure that only one object of a class get's created ?

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Q71. Can we build an application that where few functions gets executed as a cron as well as services. How ?

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Q72. How Reflection can break any design pattern ?

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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Q73. How serialization breaks Singleton pattern ?

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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Q74. Why the singleton class should never implement Cloneable interface ?

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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Q75. What are the ways to break singleton pattern ?

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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Q76. What are the disadvantages of immutability ?

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Q77. What is the programming advantage of Immutability ?

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Q78. 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 ?

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Q79. Design ATM machine application using oops.

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Q80. Can you write critical section code for singleton design pattern ?

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Q81. What is micro-benchmarking in Java?

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Q82. Design an inventory management system.

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Q83. Explain flow of MVC

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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Q84. Write code for serialization.

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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Q85. Explain Facade design pattern

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

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Q86. How one dao Implementation object (singleton) can handle multiple requests?

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Q87. What are different types of dependency injections ?

Ans. Setter injection
Constructor injection
Interface injection
Look-up method/method injection

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Q88. In a file there are 1 million words . Find 10 most frequent words in that file.

Ans. step1: first read the file
text=file.read();
step2: then split the text into words
words=text.split();
step3: count the frequency of each words
wordcount=Counter(words);
step4: find the 10 most common words
mostCommonWords=wordcount.mostCommon(10);
return mostCommonWords;

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Q89. In singleton Pattern framework, Web application deployed on multiple cluster server will have how many objects?

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Q90. What is abstraction ?

Ans. Abstraction is a process of hiding the implementation details and describing only the functionality to the user.

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