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 Q751. What is the difference between out.println(a+b); and out.println (a+" " +b); in Java? with a=2 and b=1Core Java
Ans. First will give the ouput as 3 and the second will give output as 2 1

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   Like         Discuss         Correct / Improve     java   system.out.println   coding

 Q752. Which sorting algorithm is used by Collections.sort() in Java ?Core Java
Ans. The sorting algorithm is a modified mergesort. This algorithm offers guaranteed n log(n) performance.

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   Like         Discuss         Correct / Improve     java   algorithm   collections   collections.sort   sorting algorithm      expert
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 Q753. What doesn Http keep alive header does ?Java EE
Ans. Http is connection less by default. header informs hosts to keep the connection alive so that the same connection can be reused for multiple communication.

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   Like         Discuss         Correct / Improve     java   http   http-alive   client server communication

 Q754. Do you see Class as a Data Type or Data Structure ?
Ans. Class can be better seen as Data Type. This could be implemented as a Data Structure too in some cases.

One thing worth understanding here is that Data type and Data structure are conceptual things. Class could be implementation of either of these.

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   Like         Discuss         Correct / Improve     java   oops   class   data type   data structure

 Q755. 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

 Q756. 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

 Q757. 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

 Q758. 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

 Q759. 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

 Q760. 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

 Q761. 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

 Q762. 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

 Q763. 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

 Q764. 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

 Q765. 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

 Q766. 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

 Q767. 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

 Q768. Which interfaces are implemented by BatchUpdateException?
Ans. [Iterable]

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   Like         Discuss         Correct / Improve     java   BatchUpdateException   include

 Q769. What is the package name for CertStoreParameters class?
Ans. java.lang

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   Like         Discuss         Correct / Improve     interfaces   java   CertStoreParameters   include

 Q770. Which is the Parent Class of CertStoreParameters class?
Ans. Clonable

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   Like         Discuss         Correct / Improve     interfaces   java   CertStoreParameters   include

 Q771. 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

 Q772. 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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 Q773. 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

 Q774. 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
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 Q775. 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
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 Q776. 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

 Q777. 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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 Q778. 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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 Q779. 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

 Q780. 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

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