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Ans. JShell is a feature in java 9 using which we can code and test without compiling using javac and see the result of calculations directly.

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Q2243. Design ATM machine application using oops.

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Q2244. Can we have private methods in interfaces ?

Ans. Yes, With Java 9

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Q2245. What could be the reason for allowing private methods in java 9 ?

Ans. Java 8 allowed for method implementation using default methods in interfaces. As those default methods could contain complex logic and might need organizing the logic into multiple methods, they have allowed for private methods.

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Q2246. What is the difference between WebApplicationContext, ApplicationContext, DispatcherServlet, and rootContext in Spring framework?

Spring

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Q2247. 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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Q2248. What are the components of Data Warehousing ?

Database

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Q2249. What is the difference between implementing interfaces and inheritance in Java ?

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Q2250. How many Java developers are there in world ?

General

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Q2251. What is Test driven development ?

Process

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Q2252. What is mparticle ?

Mparticle

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Q2253. What is Snowflake ?

Snowflake

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Q2254. What is the difference between developer token and refresh token ?

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Q2255. What is the difference between accessing Google Apis using client key / secrets and service account ?

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Q2256. What is the difference between Google Adwords and Adsense ?

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Q2257. What is the programming advantage of Immutability ?

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Q2258. What are the disadvantages of immutability ?

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Q2259. What is a weak reference ?

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

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Q2260. Write a program that count the number of access to a method?

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Q2261. 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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Q2262. 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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Q2263. what are the different criterions that can be specified while updating bids ?

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Q2264. What is the difference between bid modifier and bid adjustment ?

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Q2265. 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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Q2266. Mention the implicit objects in jsp

JSP

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Q2267. 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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Q2268. 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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Q2269. 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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Q2270. How Reflection can break any design pattern ?