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Interview Questions and Answers for 'Streams' - 31 question(s) found - Order By Newest

  Q1. Explain OOPs

or

Explain OOPs Principles

or

Explain OOPs Concepts

or

Explain OOPs features

or

Tell me something about OOPs
Core Java2017-06-13 08:25:45

Ans. OOPs or Object Oriented Programming is a Programming model which is organized around Objects instead of processes. Instead of a process calling series of processes, this model stresses on communication between objects. Objects that all self sustained, provide security by encapsulating it's members and providing abstracted interfaces over the functions it performs. OOP's facilitate the following features

1. Inheritance for Code Reuse
2. Abstraction for modularity, maintenance and agility
3. Encapsulation for security and protected
4. Polymorphism for flexibility and interfacing

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 Q2. What is a stream and what are the types of Streams and classes of the Streams?Core Java
Admin
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Ans. A Stream is an abstraction that either produces or consumes information. There are two types of Streams :

Byte Streams: Provide a convenient means for handling input and output of bytes.

Character Streams: Provide a convenient means for handling input & output of characters.

Byte Streams classes: Are defined by using two abstract classes, namely InputStream and OutputStream.

Character Streams classes: Are defined by using two abstract classes, namely Reader and Writer.

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   Like      Discuss      Correct / Improve     java   file io   streams   byte stream   character stream  file handling


Frequently asked to fresh graduates.
  Q3. What is a Deadlock ?Operating System
Anonymous
Ans. When two threads are waiting each other and cant precede the program is said to be deadlock.

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 Q4. Name few IO Stream classes and interfaces ?Core Java
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Ans. http://www.buggybread.com/2015/01/java-stream-io-classes-and-interfaces.html

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   Like      Discuss      Correct / Improve     java   io   input output   stream


 Q5. Explain System.out.println ?Core Java2016-11-25 09:37:08

Ans. System is a class within java.lang package that contains several useful class fields and methods. It cannot be instantiated and hence can use only statically.even in this case this has been used statically i.e with class name itself and without creating an instance.

out is the static reference of Printstream declared as following in the System Class -

public final static PrintStream out = null;

println is the method of PrintStream class.

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   Like      Discuss      Correct / Improve     System class  Streams  Input Output  println     Covansys      basic        frequent


 Q6. Tell something about BufferedWriter ? What are flush() and close() used for ?
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Ans. BufferedWriter is temporary source for data storage.BufferedWriter is used to write character data to the file.Flush() is method available in B.W which ensures that all data items are written to file including last character.Close() is used to closes the character output stream.

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   Like      Discuss      Correct / Improve     java   java io   input output   file handling   file io   output stream   bufferedwriter   flush   close


 Q7. What is Scanner class used for ? when was it introduced in Java ?Core Java
Admin
info@buggybread.com
Ans. Scanner class introduced in Java 1.5 for reading Data Stream from the imput device. Previously we used to write code to read a input using DataInputStream. After reading the stream , we can convert into respective data type using in.next() as String ,in.nextInt() as integer, in.nextDouble() as Double etc

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   Like      Discuss      Correct / Improve     java   java5   scanner   file io   file input   data input stream  file handling      basic


 Q8. What is the difference between the Reader/Writer class hierarchy and the InputStream/OutputStream class hierarchy?Core Java
Admin
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Ans. The Reader/Writer class hierarchy is character-oriented, and the InputStream/OutputStream class hierarchy is byte-oriented

  Sample Code for InputStream

  Sample Code for OutputStream

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 Q9. Which is the abstract parent class of FileWriter ?Core Java
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Ans. OutputStreamWriter

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 Q10. Which class is used to read streams of raw bytes from a file?Core Java
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Ans. FileInputStream

  Sample Code for FileInputStream

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 Q11. Which is the Parent class of FileInputStream ?Core Java
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Ans. InputStream

  Sample Code for InputStream

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 Q12. Which exceptions should be handled with the following code ?

FileOutputStream fileOutputStream = new FileOutputStream(new File("newFile.txt"));
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Ans. FileNotFoundException

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 Q13. Will this code compile fine ?

ObjectOutputStream objectOutputStream = new ObjectOutputStream(new FileOutputStream(new File("newFile.txt")));
Core Java
Admin
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Ans. Yes.

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 Q14. What is System.in in Java ?Core Java2016-09-02 08:24:11

Ans. It is an InputSream which is usually connected to the keyboard input of console program.

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 Q15. Have you ever tried compressing data using Java ?Core Java2016-11-15 11:10:29

Ans. Yes, we can use ZipInputStream class for compressing the FileInputstream object.

  Sample Code for ZipInputStream

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 Q16. How Spliterator in Java 8 different than iterator ?Core Java2016-11-24 09:44:49

Ans. Though there are many differences the way internally they both iterates the collections and streams respectively, but the main difference in performance that is achieved by spliterator as it can iterate Streams in Parallel whereas iterator only iterates collections sequentially.

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 Q17. Which is better in terms of performance - Iterator or Spliterator ?Core Java2016-11-24 09:46:26

Ans. Spliterator has better performance potential than iterators but only if the potential is used. Spliterator can iterate streams in parallel as well as in sequence whereas iterator can only iterate in sequence.

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 Q18. Difference between System.out.printf and System.out.println ?Core Java2016-11-25 09:38:09

Ans. println prints an additional end of line whereas printf doesnt.

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 Q19. What is Spring Security ?Spring2017-01-10 09:13:58

Ans. Spring Security is a powerful and highly customizable authentication and access control framework. It is the de facto standard for securing Spring-based applications.

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 Q20. What is the difference between the Reader/Writer java.io hierarchy and the Stream class hierarchy?Core Java2017-01-12 14:17:13

Ans. The Reader/Writer hierarchy is character oriented, whereas the Stream class hierarchy is byte oriented.

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Usually asked to entry level software developers.
  Q21. Write a program to swap two variables without using thirdCore Java2017-01-19 15:38:34

Ans. public static void main(String[] args) {
   int num1 = 1;   
   int num2 = 2;
   num1 = num1^num2;
   num2 = num1^num2;
   num1 = num1^num2;
   System.out.print("num1 = " + num1 +", num2 = "+num2);
}

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 Q22. Write a class / program that takes few numbers from the input and then output the average ?Core Java2017-01-27 14:26:00

Ans. public class Class{
   public static void main(String[] args){
      List<Integer> collector = new ArrayList();

      Scanner scanner = new Scanner(System.in);
      int x = scanner.nextInt();
      while(x != 0){
         collector.add(x);
         x = scanner.nextInt();
      }
      System.out.println(collector.stream().collect(Collectors.averagingInt(p->((Integer)p))));
   }
}

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 Q23. What is a gobbler class ?Core Java2017-03-25 10:38:17

Ans. A gobbler class take care of reading from a stream and optionally write out to another stream. Allows for non blocking reads when invoking a process through Runtime.exec(). Moreover the user can specify a callback that is called whenever anything is read from the stream.

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 Q24. What is a shard in Kinesis stream ?Amazon Web Services (AWS)2017-06-14 07:40:42

Ans. A shard is a uniquely identified group of data records in a stream or we can say that Shard is a partition in Kinesis stream. A shard supports a fixed bandwidth i.e fixed number of messages per second. The total capacity of the stream is the sum of the capacities of its shards. If the data rate changes, we can allocate / deallocate more shards to accommodate that.

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 Q25. What is the relationship between shard and partition key in kinesis stream ?Amazon Web Services (AWS)2017-06-14 07:42:01

Ans. A partition key is used to group data by shard within a stream. A partition key identifies which shard the message belong to.

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 Q26. What is the difference between stream and parallel stream ?Core Java2017-08-17 11:02:04

Ans. streams are used for sequential processing of data and parallel streams are used for parallel processing of data (only if the underlying processor is multicore).

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 Q27. How can i split a linked list in two parts in java 8?Core Java2017-10-22 15:00:24

Ans. This can be done using a Spliterator.

LinkedList list = Arrays.asList("names","numbs","birds","animals");
Spliterator split1 = list.Spliterator();
Spliterator split2 = split1.Spliterator();

Now, the LinkedList is split into split1 and split2.
use split2 first then split1 to check the output.

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   Like      Discuss      Correct / Improve     java 8  parallel stream  spliterator     SMC Angola


 Q28. What are we doing here

list.stream().collect(Collectors.groupingBy(ClassA::getElement1,
               Collectors.averagingDouble(ClassA::getelement2)));
Core Java2018-04-10 14:58:24

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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 Q29. What will the following code return

list.stream().collect(Collectors.groupingBy(ClassA::getElement1,
               Collectors.averagingDouble(ClassA::getElement2)));
Core Java2018-04-10 15:00:20

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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 Q30. How does encoding affect using Reader / writer classes or Stream classes in Java ? Core Java2018-06-27 09:53:06

 This question was recently asked at 'Symantec'.This question is still unanswered. Can you please provide an answer.


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 Q31. What is input Stream ?Core Java2018-12-12 15:38:47

 This question was recently asked at 'SQUAD Infotech'.This question is still unanswered. Can you please provide an answer.


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   Like      Discuss      Correct / Improve     stream  inout output  inour stream     SQUAD Infotech




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