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Q1261. What should we do If we need to know the IP of the machine where Lambda function runs ?

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Q1262. How to know IP of the machine where lambda function runs ?

Amazon Web Services (AWS)

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Q1263. 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 ?

Core Java

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Q1264. What does @VisibleForTesting annotation denotes ?

Testing

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Q1265. What is the advantage of BidDecimal over Double ?

Core Java

Ans. BigDecimal provides more precision as compared to double.

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Q1266. 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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Q1267. 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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Q1268. Can you explain following exception

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

Core Java

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Q1269. 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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Q1270. 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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Q1271. 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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Q1272. 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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Q1273. Mention the implicit objects in jsp

JSP

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Q1274. 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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Q1275. What is the difference between bid modifier and bid adjustment ?

Adwords

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Q1276. what are the different criterions that can be specified while updating bids ?

Adwords

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Q1277. 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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Q1278. Difference between Eager and Lazy loading in hibernate ?

Hibernate

Ans. Lazy Loading is loading of entities on demand when subclass is called, while Eager loading is loading of all the sub entity at the start only.

Eager loading is fast as all sub entities are already present, but its heavy(takes more memory)

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Q1279. Write a program that count the number of access to a method?

Core Java

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Q1280. What is a weak reference ?

Core Java

Ans. A weak reference is a reference that gets removed on the next garbage collection cycle.

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Q1281. What are the disadvantages of immutability ?

Design

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Q1282. What is the programming advantage of Immutability ?

Design

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Q1283. What is the difference between Google Adwords and Adsense ?

Adwords

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Q1284. What is the difference between accessing Google Apis using client key / secrets and service account ?

Adwords

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Q1285. What is the difference between developer token and refresh token ?

Adwords

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Q1286. What is Snowflake ?

Snowflake

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Q1287. What is mparticle ?

Mparticle

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Q1288. What is Test driven development ?

Process

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Q1289. What is the relation between classes in Java ?

Core Java

Ans. There are different types of relationship between classes

Inheritance - Also called is-a relationship, Child class object carries the body of the Parent class when initiated. Moreover there are certain privileges attach to method overriding to the classes related this way. This relationship exist for code reuse, method overriding and interfacing ( through abstract class ).

Composition - Also called has-a relationship. Class objects carries a reference to other class objects when instantiated. This relationship exist for work flow / work delegation.

Inner / Nested class - It’s a relationship that encapsulates the inner class or it’s object within the outer class. This relationship exist for encapsulation / security.

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Q1290. How many Java developers are there in world ?

General

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