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

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Q661. What are the Messaging systems / technologies you have worked with ?

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Q662. What information should be sent in url vs sent within the body in case of Post request ?

Design

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Q663. Do you think we should have security Tokens in Url ?

Design

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Q664. Have you heard of Rest method Patch ?

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Q665. Explain CAP Theorem.

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Q666. Can you design a program that can identify if two shapes on x and y plane would intersect ?

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Q667. Can you give an example of a Get and Post Request.

Web Service

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Q668. Which of the following - arrays or LinkedList allow elements to be accessed using index and how ?

Data Structure

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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Q669. Have you ever faced challenged with your current work ?

general

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Q670. Can we capture the Request body within the interceptor or Filter and perform operations on it ?

Spring

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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Q671. Explain your experience working on UI ? Have you worked with JSF ?

General

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Q672. How can we make sure that only one object of a class get's created ?

Design

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Q673. Difference between Arrays and LinkedList ?

Data Structure

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Q674. How are hash codes generated ?

Data Structure

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

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Q675. Write code to get count of every 5 letter word in a string using lambda expression

Core Java

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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Q676. What are different types of No Sql Databases ?

NoSql

Ans. graph based
column based
document based

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Q677. What are different in memory data structures that are used in No Sql Database ?

NoSql Database

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Q678. How to assign a static or IP range to Lambda Function ?

Amazon Web Services (AWS)

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Q679. 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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Q680. How to know IP of the machine where lambda function runs ?

Amazon Web Services (AWS)

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Q681. What does @VisibleForTesting annotation denotes ?

Testing

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Q682. What is the advantage of BidDecimal over Double ?

Core Java

Ans. BigDecimal provides more precision as compared to double.

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Q683. What will the following code return

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

Core Java

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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Q684. What are we doing here

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

Core Java

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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Q685. 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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Q686. 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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Q687. 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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Q688. 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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Q689. Create a stack of specific size using arrayList?

Data Structure

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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Q690. Should we have instance variables in the Spring Bean which has been scoped as Singleton ?

Spring

Ans. No, if required we should only have final variables. Bean scoped singleton means that only one instance of the bean will be created and will be shared among different requests and hence instance variables will get shared too.

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