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Q2101. What is the difference between bid modifier and bid adjustment ?

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Q2102. Create a stack of specific size using arrayList?

Ans. public class StackUsingArrayList {
   public static void main(String[] args) {
      List list = new ArrayList();
      list.add("A");
      list.add("B");
      list.add("C");

      Stack stack = new Stack();

      list.forEach(a -> stack.add(a));
      System.out.println(stack);

   }
}

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Q2103. 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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Q2104. Can you explain following exception

java.lang.ArithmeticException: Non-terminating decimal expansion; no exact representable decimal result.

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Q2105. What are we doing here

list.stream().collect(Collectors.groupingBy(ClassA::getElement1,
Collectors.averagingDouble(ClassA::getelement2)));

Ans. We are averaging elements of a collection by element1 grouped by element1

* list is the reference of collection
* element1 is the member element returned by getElement1 method of ClassA
* element2 is the member element returned by getElement2 method of ClassA

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Q2106. What will the following code return

list.stream().collect(Collectors.groupingBy(ClassA::getElement1,
Collectors.averagingDouble(ClassA::getElement2)));

Ans. Map<DataType1,DataType2> where DataType1 is the data type of element1 ( returned by getelement1 method ) and DataType2 is the data type of element2 ( returned by getElement2 method )

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Q2107. What is the advantage of BidDecimal over Double ?

Ans. BigDecimal provides more precision as compared to double.

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Q2108. What is the difference between following rounding modes

RoundingMode.CEILING
RoundingMode.DOWN
RoundingMode.FLOOR
RoundingMode.HALF_DOWN
RoundingMode.HALF_UP
RoundingMode.HALF_EVEN

Which is the one you use often and Why ?

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Q2109. How to know IP of the machine where lambda function runs ?

Amazon Web Services (AWS)

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Q2110. What should we do If we need to know the IP of the machine where Lambda function runs ?

Amazon Web Services (AWS)

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Q2111. How to assign a static or IP range to Lambda Function ?

Amazon Web Services (AWS)

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Q2112. Have you worked on creating any cron job ?

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Q2113. Have you used any framework to capture command line arguments or options ?

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Q2114. What are different in memory data structures that are used in No Sql Database ?

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Q2115. How would you choose your favorite company name for e.g. three companies are given in radio buttons Infosys, TCS and Aricent. Do You need to loop trough all radio buttons and select your favorite company or can just get the selected value.

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Q2116. Write code to get count of every 5 letter word in a string using lambda expression

Ans. String str = "I had been saying that he had been there";

Map<String,Long> countWords = Arrays.asList(str.split(" ")).stream().filter(p->p.length() = 5).collect(Collectors.groupingBy(p->p,Collectors.counting()));

System.out.println(countWords);

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Q2117. Can you write code so that we can keep track of Keys that have their values changed along with the number of times they were changed.

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Q2118. How are hash codes generated ?

Ans. Use hashCode() which returns an integer value, generated by a hashing algorithm

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Q2119. What are the different types of methods in Java ?

Ans. Static Methods
Instance Methods
Accessor / Mutator or getter setters

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Q2120. Are getters setter / accessor mutator methods instance methods or static methods ? why ?

Ans. They are usually instance methods. They are usually applied to DAOs / DTOs / POJO that are used to transport objects and used to access object elements. As they are tied to objects and are not common to all objects of a class, hence they are created as non static.

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Q2121. Design a class that find all files with SSN.

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Q2122. Describe inheritance and polymorphism and their importance for OOP.

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Q2123. What is the difference between instantiation and initialization ?

Ans. Instantiation is the process of reserving memory for the object

For ex -

List list = new ArrayList();

Initialization is the process of setting the default value for the object or default object construction.

List list = new ArrayList(set);

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Q2124. Why do we need to close the Scanner ?

Ans. For releasing input stream reference (System.in), you should close scanner.

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Q2125. Difference between Arrays and LinkedList ?

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Q2126. How can we make sure that only one object of a class get's created ?

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Q2127. Explain your experience working on UI ? Have you worked with JSF ?

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Q2128. Have you faced any problem integrating software / services with any of your partners or vendors ?

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Q2129. Have you ever faced challenged with your current work ?

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Q2130. Which of the following - arrays or LinkedList allow elements to be accessed using index and how ?

Ans. Arrays allows elements to be accessed directly using the index.

As Array elements are stored in continuous memory locations it's very easy to find the memory address of any element using the formula as following

Memory Address of Array start or index 0 + ( Size of array element * Index )

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