Interview questions on java 8 Operation and Joiner Class for experienced.

 Part 1

Interview questions on Java 8 Operation and Joiner Class for experienced covered in this post:

    What is the difference between Intermediate operations and Terminal operations?

	Intermediate operations	Terminal operations
1.	These operations return the processed stream.	Terminal operations can return any type of object.
2.	Intermediate operations are lazy loading operations.	Terminal operations are eager loading operations.
3.	Intermediate operations can contain any number of operations.	Terminal operations can have only one operation.
4.	Intermediate operations cannot create final result.	Terminal operation can create final operation.
5.	E.g. 1. filter() 2. map() 3. sorted() 4. distinct() 5. skip() 6. limit()	E.g. 1. collect() 2. forEach() 3. min() 4. max() 5. count() 6. findFirst() 7. findAny() 8. reduce() 9. toArray() 10. anyMatch() 11. allMatch() 12. noneMatch()

 

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    What is the purpose of StringJoiner class?

-          StringJoiner class can be used to join the list or array with a specified delimiter.

-          Please refer to the below example.

package org.practice.staticmethoddemo.streamapi;  import java.util.Arrays; import java.util.List; import java.util.StringJoiner; import java.util.stream.Collectors;  public class StringJoinerDemo {        public static void main(String[] args) {             StringJoiner joiner = new StringJoiner(",");             joiner.add("Arpita")                         .add(" Yogesh")                         .add(" Sanas");             System.out.println(joiner.toString());                        StringJoiner joiner1 = new StringJoiner(":","[","]");             joiner1.add("Arpita")                         .add(" Yogesh")                         .add(" Sanas");             System.out.println(joiner1.toString());                        List<String> list = Arrays.asList("Arpita","Yogesh","Sanas");             String joiner2 = list.stream()                                           .collect(Collectors.joining(","));             System.out.println(joiner2.toString());               } } Output: Arpita, Yogesh, Sanas [Arpita: Yogesh: Sanas] Arpita,Yogesh,Sanas

    What is Metaspace introduced in java 8?

-          PermGen:

1.       PermGen (Permanent Generation) is a special heap space separated from the main memory.

2.       The JVM keeps track of class metadata in the PermGen. Also, the JVM stores all the static content in this.

3.       Due to limited memory size, PermGen can throw OutOfMemoryError.

-          Metaspace:

1.       Metaspace is new memory space.

2.       It has replaced the older PermGen memory space.

3.       It can now handle memory allocation.

                 4.       Metaspace grows automatically by default. 

• Java interview questions and answers all MNC - Click here

• Basic core java interview questions and answers for freshers - Click here

• Core java interview questions for 3 years experience - Click here

• Core java interview questions and answers for 3-5 years exp - Click here

• Core java interview questions and Answers for 5 - 7 Years exp - Click here

• Basic Java Interview Questions and Answers - Click here

• Java interview questions and answers on oops - Click here

• Java interview questions and answers on Strings - Click here

• Java interview questions on exception handling - Click here

• Interview questions on multithreading in java for experienced - Click here

• Interview questions on serialization in java for experienced - Click here

• Interview questions on inner class in java for experienced - Click here

• Interview questions on Collections in java for experienced - Click here

Upcoming questions in next post:

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