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 Q751. Which of the following data type you will prefer to store price - BigDecimal or Double ?
Ans. BigDecimal if memory and Performance is not critical concern, otherwise double.

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   Like         Discuss         Correct / Improve     java   data types   double   bigdecimal

 Q752. 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

 Q753. 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

 Q754. 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

 Q755. 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

 Q756. 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

 Q757. 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

 Q758. 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

 Q759. 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

 Q760. 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

 Q761. 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

 Q762. 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

 Q763. 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

 Q764. Which interfaces are implemented by BatchUpdateException?
Ans. [Iterable]

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   Like         Discuss         Correct / Improve     java   BatchUpdateException   include

 Q765. What is the package name for CertStoreParameters class?
Ans. java.lang

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   Like         Discuss         Correct / Improve     interfaces   java   CertStoreParameters   include

 Q766. Which is the Parent Class of CertStoreParameters class?
Ans. Clonable

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   Like         Discuss         Correct / Improve     interfaces   java   CertStoreParameters   include

 Q767. 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

 Q768. 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
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 Q769. 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

 Q770. 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

 Q771. 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

 Q772. 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

 Q773. 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

 Q774. 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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 Q775. Which of the following is fastest to locate the DOM element ?

a. document.getElementById
b. document.getElementByName
c. document.ElementName.SubElementName
d. They all result in similar performance in retrieving the DOM element.
Ans. document.ElementName.SubElementName

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   Like         Discuss         Correct / Improve     html   dom   javascript

 Q776. Which of the following is not a Table tag ? a. th b. td c. tb d.
Ans. tb

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   Like         Discuss         Correct / Improve     html   table   html tags

 Q777. Why should we have Javascript method definitions within HTML Head section ?

a. Its safe to have javascript code within head section
b. Head section gets loaded even if there is any error in loading HTML page
c. Head section gets executed first and hence assure that js method definition will be loaded before they are called
d. So that we can have method definition and method call at the same place
Ans. Head section gets executed first and hence assure that js method definition will be loaded before they are called

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   Like         Discuss         Correct / Improve     html   head section   javascript

 Q778. Which of the following is usually not part of EAR file ?

a. Server Configuration files
b. HTML and Media Files
c. Application Configuration files
d. Class files
Ans. Server Configuration files

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   Like         Discuss         Correct / Improve     ear   deployment   servers   java

 Q779. Which of the following are usually manual ?

a. Unit Test
b. Integration Test
c. Load Test
d. Both a and c
Ans. Integration Test

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   Like         Discuss         Correct / Improve     testing   manual testing   automated testing

 Q780. What is the default location of local repository ?

a. ~/.m2/repo
b. ~/m2./home/repository
c. ~/m2./repository
d. ~/m2./home/repo
Maven
Ans. ~/m2./repository

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   Like         Discuss         Correct / Improve     maven   repositories   local repositories   m2

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