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Q1451. Does Java 9 allows same package within different modules ?

Core Java

Ans. Yes it allows if the modules are mapped to different class loaders.

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Q1452. What are the qualified and unqualified packages ?

Core Java

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Q1453. How does modularity in Java 9 facilitates better encapsulation ?

Core Java

Ans. By providing dependencies , services and exports explicitly

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Q1454. How does Java 9 provides backward compatibility with libraries that haven't published themselves as modules ?

Core Java

Ans. Though Automatic modules. Any JAR on the module path without module descriptor ends up as automatic module

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Q1455. What is the default setting for Automatic modules regarding exporting packages and reading modules ?

Core Java

Ans. As one purpose of automatic module is to provide backward compatibility with the module less dependencies, automatic modules exports all packages and include all other modules.

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Q1456. What is JShell?

Core Java

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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Q1457. What could be the reason for allowing private methods in java 9 ?

Core Java

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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Q1458. How many Java developers are there in world ?

General

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Q1459. What is mparticle ?

Mparticle

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Q1460. What is Snowflake ?

Snowflake

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Q1461. What is the programming advantage of Immutability ?

Design

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Q1462. What are the disadvantages of immutability ?

Design

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Q1463. 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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Q1464. Write a program that count the number of access to a method?

Core Java

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Q1465. 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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Q1466. 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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Q1467. 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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Q1468. 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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Q1469. 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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Q1470. 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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Q1471. 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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Q1472. 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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Q1473. What is the advantage of BidDecimal over Double ?

Core Java

Ans. BigDecimal provides more precision as compared to double.

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Q1474. What does @VisibleForTesting annotation denotes ?

Testing

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Q1475. How to know IP of the machine where lambda function runs ?

Amazon Web Services (AWS)

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Q1476. 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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Q1477. How to assign a static or IP range to Lambda Function ?

Amazon Web Services (AWS)

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Q1478. What are different in memory data structures that are used in No Sql Database ?

NoSql Database

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Q1479. What are different types of No Sql Databases ?

NoSql

Ans. graph based
column based
document based

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Q1480. 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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