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Interview Questions and Answers - Order By Newest

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 Q1001. When are static and instance methods resolved ? During compile time or Runtime ?
Ans. Static methods are resolved during compile time and hence they cannot participate in runtime polymorphism. Instance methods are resolved during runtime.

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   Like         Discuss         Correct / Improve     java   static methods   methods   runtime polymorphism      intermediate

 Q1002. What will the following code result ?

List> intList = new ArrayList>();

intList.add(Optional.empty());
intList.add(Optional.of(2));
intList.add(Optional.of(3));
intList.add(Optional.of(4));

System.out.println(intList.get(null));
Ans. Compile time error at last line as the get method expect argument of type native int.

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   Like         Discuss         Correct / Improve     arraylist   list   coding   collections

 Q1003. What will the following code result ? Will it compile ?

List> intList = new ArrayList>();

intList.add(Optional.empty());
intList.add(Optional.of(2));
intList.add(Optional.of(3));
intList.add(Optional.of(4));

System.out.println(intList.get((Integer)null));
Ans. Yes but the last line will throw NullPointerException upon execution.

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   Like         Discuss         Correct / Improve     collections   arraylist   list   coding

 Q1004. What will be the output ?Integer a = 10, b =10;Integer c = 10, d = 1000;System.out.println(a == b);System.out.println(c ==d);Core Java
Ans. truefalse

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   Like         Discuss         Correct / Improve     java   coding   equality   object equality

 Q1005. How to determine if the linked list has a cycle in it ?
Ans. http://stackoverflow.com/questions/494830/how-to-determine-if-a-linked-list-has-a-cycle-using-only-two-memory-locations

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   Like         Discuss         Correct / Improve     linked list   data structure   algorithm   java   ebay

 Q1006. Can we have multiple classes in single file ?
Ans. Yes, but there can be only 1 public class in a single file.

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   Like         Discuss         Correct / Improve     java   classes

 Q1007. What is OutOfMemoryError in Java?Core Java
Ans. OutOfMemoryError in Java is a subclass of VirtualMachineError and is thrown by JVM when it runs out of heap memory.

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   Like         Discuss         Correct / Improve     outofmemoryerror   error   exceptions   jvm   java   heap memory   heap

 Q1008. What is Apache Kafka ?BigData
Ans. Kafka is a distributed, partitioned, replicated commit log service. It provides the functionality of a messaging system through messages being written to logs.

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   Like         Discuss         Correct / Improve     kafka   bigdata   message queue     Asked in 4 Companies

 Q1009. What is a broker in Apache Kafka ?
Ans. Kafka is run as a cluster comprised of one or more servers each of which is called a broker

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   Like         Discuss         Correct / Improve     kafka   bigdata   message queue

 Q1010. What is a Topic in Apache Kafka ?
Ans. A topic is a category or feed name to which messages are published

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   Like         Discuss         Correct / Improve     kafka   bigdata   message queue

 Q1011. Do you know of any facility to convert between Scala and Java Util Collections ?Scala
Ans. We can use JavaConversions which is a part of Scala Library.

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   Like         Discuss         Correct / Improve     scala   scala collections   java collections

 Q1012. Have you used Kafka in your project ? If Yes, for what ?
Ans. We were using Kafka as a replacement for JMS Message Queue for better throughput. We were just using a simple Java multi threaded client as order of message consumption didn't matter to us.

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   Like         Discuss         Correct / Improve     kafka   bigdata   message queue   java

 Q1013. Does Kafka uses ZooKeeper ?
Ans. Yes

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   Like         Discuss         Correct / Improve     kafka   bigdata   yes-no   yes no

 Q1014. Which interfaces are implemented by BatchUpdateException?
Ans. [Iterable]

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   Like         Discuss         Correct / Improve     java   BatchUpdateException   include

 Q1015. What is the package name for CertStoreParameters class?
Ans. java.lang

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   Like         Discuss         Correct / Improve     interfaces   java   CertStoreParameters   include

 Q1016. Which is the Parent Class of CertStoreParameters class?
Ans. Clonable

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   Like         Discuss         Correct / Improve     interfaces   java   CertStoreParameters   include

 Q1017. Action Class is singleton and hence not thread safe in ..

a. All versions of Struts
b. Struts 1
c. Struts 2
d. None of Struts versions
Ans. Struts 1

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   Like         Discuss         Correct / Improve     struts   j2ee   mvc frameworks   struts1   struts2

 Q1018. Which is of the following is NOT TRUE for JVM ?

a. JVM reads Byte Code and generates Machine Code.
b. JVM is a virtual Machine that acts as a intermediary between Java Application and Host Operating System.
c. JVM reads Source Code and generates Byte Code.
d. JVM acts as a translator that translates different Machine code ( on the basis of Host Machine ) for a common Byte Code.
Ans. JVM reads Source Code and generates Byte Code.

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   Like         Discuss         Correct / Improve     java   jvm

 Q1019. If we add Enum constants to a sorted collection ( Treemap , TreeSet ), What will be the order in which they will be maintained ?

a. Sorted Collection wont maintain them in any order.
b. Insertion Order
c. Order in which constants are declared.
d. Natural Sorting Order.
Ans. Order in which constants are declared.

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   Like         Discuss         Correct / Improve     enum   collections   sorted collections   treemap   treeset   compareto   comparable   java

 Q1020. Which of the following is not type of inner classes ?

a. Simple Inner Class
b. Static Nested Inner Class
c. Method Nested Static Inner Class
d. Anonymous Inner Class
Ans. Method Nested Static Inner Class

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   Like         Discuss         Correct / Improve     java   classes   inner classes
Try 1 Question(s) Test

 Q1021. Which of the following was not introduced with Java 5 ?

a. Generics
b. Strings within Switch
c. Enums
d. Annotations
Ans. Strings within Switch

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   Like         Discuss         Correct / Improve     java   java5

 Q1022. Which interface does java.util.Hashtable implement ?

a. List
b. Set
c. Collection
d. Map
Core Java
Ans. Map

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   Like         Discuss         Correct / Improve     hashtable   java   collections

 Q1023. Which of the following is false ?

a. HashMap came before HashTable.
b. HashMap allows null values whereas Hashtable doesn’t allow null values.
c. HashTable and HashMap allow Key-Value pairs.
d. Hashtable is synchronized whereas HashMap is not.
Ans. HashMap came before HashTable.

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   Like         Discuss         Correct / Improve     map   hashmap   hashtable   collection   java
Try 2 Question(s) Test

 Q1024. Which of the following is true ?

a. We can serialize static variables
b. We can serialize transient variables
c. We can serialize final variables
d. We can serialize instance methods
Ans. We can serialize final variables

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   Like         Discuss         Correct / Improve     serialization   java   file io
Try 1 Question(s) Test

 Q1025. Which of the following is not the use of this keyword ?

a. Passing itself to another method
b. To call the static method
c. Referring to the instance variable when local variable has the same name
d. Calling another constructor in constructor chaining
Ans. To call the static method

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   Like         Discuss         Correct / Improve     this   this keyword   java

 Q1026. Which of the collections allows null as the key ?

a. HashTable
b. HashMap
c. TreeMap
d. LinkedHashMap		Core Java
Ans. HashMap

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   Like         Discuss         Correct / Improve     java   collections   map  hashtable     Asked in 2 Companies      basic        frequent

 Q1027. What is the initial state of a thread when it is created and started ?

a. Wait
b. Running
c. Ready
d. Sleep
Ans. Ready

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   Like         Discuss         Correct / Improve     java   threads   multithreading   thread states

 Q1028. What state does a thread enter when it terminates its processing?

a. Wait
b. Ready
c. Dead
d. Running
Ans. Dead

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   Like         Discuss         Correct / Improve     java   threads   multithreading   thread states

 Q1029. How many bits are used to represent Unicode ?

a. 8 bits
b. 16 bits
c. 24 bits
d. 32 bits
Ans. 16 bits

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   Like         Discuss         Correct / Improve     java   character coding   character encoding

 Q1030. How do I determine which POM contains missing transitive dependency?

a. mvn -A
b. mvn -M
c. mvn -R
d. mvn -X
Maven
Ans. mvn -X

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   Like         Discuss         Correct / Improve     maven   maven transitive dependencies

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