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Q961. Can we access elements at a particular index using LinkedList collection class ?

Ans. Yes we can. But as the underlying structure of the collection class is double linked list, it will eventually have to traverse to the element linearlly and hence would result in bad performance.

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Q962. 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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Q963. Can we capture the Request body within the interceptor or Filter and perform operations on it ?

Ans. Yes, But with interceptor it will remove the body from the request and then we will have to explicitly add the attributes to the session to forward it to the handler.

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Q964. Explain your experience working on UI ? Have you worked with JSF ?

^{This question was recently asked at 'Spillman Technologies'.This question is still unanswered. Can you please provide an answer.}

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Q965. How can we make sure that only one object of a class get's created ?

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Q966. Difference between Arrays and LinkedList ?

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Q967. Why do we need to close the Scanner ?

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

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Q968. 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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Q969. Describe inheritance and polymorphism and their importance for OOP.

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Q970. Design a class that find all files with SSN.

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Q971. 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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Q972. What are the different types of methods in Java ?

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

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Q973. How are hash codes generated ?

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

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Q974. 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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Q975. 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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Q976. 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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Q977. Have you used any framework to capture command line arguments or options ?

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Q978. Have you worked on creating any cron job ?

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Q979. How to assign a static or IP range to Lambda Function ?

Amazon Web Services (AWS)

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Q980. 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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Q981. How to know IP of the machine where lambda function runs ?

Amazon Web Services (AWS)

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Q982. 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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Q983. What is the advantage of BidDecimal over Double ?

Ans. BigDecimal provides more precision as compared to double.

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Q984. 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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Q985. 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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Q986. Can you explain following exception

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

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Q987. 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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Q988. 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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Q989. 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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_{Like Discuss Correct / Improve singleton Asked in 2 Companies expert}

Q990. 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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