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 Q911. Which takes more memory - float or Float ?Core Java
Ans. float is a native data type whereas Float is a class. A Float object will always take more memory than float variable as there are metadata overheads with the objects.

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   Like         Discuss         Correct / Improve     java   data type   float     Asked in 3 Companies      basic        frequent

 Q912. Difference between HashMap and WeakHashMap ?
Ans. WeakHashMap uses weak reference for keys, which means if the key object doesn't have any reference then both key/value mapping will become eligible for garbage collection.

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   Like         Discuss         Correct / Improve     java   collections   hashmap   weakhashmap   difference between   garbage collection   ebay

 Q913. Which tree is used to implement TreeMap in Java?
Ans. Red Black Tree

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   Like         Discuss         Correct / Improve     java   collections   treemap   map      expert

 Q914. What is collision in hash collections ?Core Java
Ans. Collision is the situation when two different elements have the same Hash Code.

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   Like         Discuss         Correct / Improve     java   collections   collision   hashcode  hash code   hash collections   ebay     Asked in 1 Companies      intermediate        frequent

 Q915. 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

 Q916. 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

 Q917. 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

 Q918. 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

 Q919. 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

 Q920. 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

 Q921. 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

 Q922. 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

 Q923. 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

 Q924. 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

 Q925. 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

 Q926. Does Kafka uses ZooKeeper ?
Ans. Yes

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

 Q927. Which interfaces are implemented by BatchUpdateException?
Ans. [Iterable]

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   Like         Discuss         Correct / Improve     java   BatchUpdateException   include

 Q928. What is the package name for CertStoreParameters class?
Ans. java.lang

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   Like         Discuss         Correct / Improve     interfaces   java   CertStoreParameters   include

 Q929. Which is the Parent Class of CertStoreParameters class?
Ans. Clonable

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   Like         Discuss         Correct / Improve     interfaces   java   CertStoreParameters   include

 Q930. 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

 Q931. 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

 Q932. 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

 Q933. 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

 Q934. 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

 Q935. 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

 Q936. 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

 Q937. 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

 Q938. 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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 Q939. 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

 Q940. 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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