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Interview Questions and Answers - Order By Newest

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 Q61. Is It Good to use Reflection in an application ? Why ?Core Java
Ans. no, It's like challenging the design of application.

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   Like         Discuss         Correct / Improve     java   reflection api   yes-no   architecture     Asked in 1 Companies      intermediate

Very frequently asked. Usually followed by questions related to private constructor and synchronized access. Frequently asked in JPMorgan and TCS (Based on 2 feedback)
  Q62. Explain Singleton Design Pattern ?Design
Ans. http://www.buggybread.com/2014/03/java-design-pattern-singleton-interview.html

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   Like         Discuss         Correct / Improve     java   design pattern   singleton   at&t   ebay  fidelity india  united healthcare india     Asked in 46 Companies      intermediate        frequent

 Q63. Can we extend an Enum ?Core Java
Ans. No. Enums are final by design.

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   Like         Discuss         Correct / Improve     java   enums   inheritance  object oriented programming (oops)  oops concepts   yes-no     Asked in 1 Companies      intermediate

 Q64. What is Closeable ?Core Java
Ans. A Closeable is an interface which is a source or destination of data that can be closed.

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   Like         Discuss         Correct / Improve     closeable   interfaces      intermediate        rare

 Q65. Name few Locale classes and interfaces ?
Ans. http://www.buggybread.com/2015/01/java-locale-classes-and-interfaces.html

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   Like         Discuss         Correct / Improve     java   util   java.util   locale      intermediate        rare

 Q66. 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

 Q67. 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

 Q68. What are fail-fast Iterators ?Core Java
Ans. Fail-fast iterators detect illegal concurrent modification during iteration and fail quickly and cleanly rather than risking arbitrary, non deterministic behavior at an undetermined time in future. Example could be of an Iterator failing if it smells ConcurrentModificationException.

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   Like         Discuss         Correct / Improve     fail-fast Iterators  Iterators     Asked in 5 Companies      intermediate

 Q69. What is the use of Synchronized block ?Core Java
Ans. The goal of a synchronised block is to achieve mutual exclusion i.e at one time, the segment of the code should be executed by single thread only and hence the lock needs to be retrieved before executing the segment and then released.

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   Like         Discuss         Correct / Improve     synchronized block   synchronized   synchronization   multithreading   threads   mutual exclusion   concurrency     Asked in 4 Companies      intermediate        frequent
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Recently asked in Sophos
 Q70. Write a Method to get a map of words and their count by passing in the stringCore Java
Ans. http://javasearch.buggybread.com/CodeSnippets/searchCodeSamples.php?keyword=Method+to+get+a+map+of+words&category=code

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   Like         Discuss         Correct / Improve     map  collections     Asked in 2 Companies      intermediate

 Q71. Write code for singleton classDesign
Ans. http://javasearch.buggybread.com/CodeSnippets/searchCodeSamples.php?keyword=singleton+class&category=code

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   Like         Discuss         Correct / Improve     singleton  code  coding  design pattern     Asked in 1 Companies      Intermediate        frequent

 Q72. Write code for the usage of Builder Design Pattern
Ans. http://javasearch.buggybread.com/CodeSnippets/searchCodeSamples.php?&category=code&searchOption&keyword=964

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   Like         Discuss         Correct / Improve     builder design pattern  builder pattern  code  coding      intermediate

 Q73. Can we have try statement without catch? If try statement contains return will the finally block be executed? What happens if there is an exception inside finally block?Core Java
Ans. Yes, with finally.

Yes, finally block will be executed even if there is no exception in try block.

If finally throws an exception, the exception gets thrown to the calling module.

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   Like         Discuss         Correct / Improve     exception handling     Asked in 1 Companies      intermediate

 Q74. Should a DB Insert Request be a POST or PUT request in RestRest
Ans. It depends on whether the request object is persisted as it is

or

its first dismantled, modified or refactored and then inserted into DB.

In first case, it should be a PUT request whereas in second case it should be a POST Request.

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   Like         Discuss         Correct / Improve     Put vs Post   Rest     Asked in 2 Companies      intermediate        frequent

 Q75. How to Bulk upload the data into Oracle database?Database
Ans. We can use external table feature of Oracle.

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   Like         Discuss         Correct / Improve          Asked in 1 Companies      Intermediate

Frequently asked Design Pattern interview question.
 Q76. What is a prototype design pattern ?Design
Ans. The prototype pattern is a creational design pattern. It is used when the type of objects to create is determined by a prototypical instance, which is cloned to produce new objects. Prototype is used when we need duplicate copies of objects.

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   Like         Discuss         Correct / Improve     design pattern  prototype design pattern  cloning     Asked in 11 Companies      intermediate

Usually asked with Questions related to Generics.
 Q77. What are Type Erasures in Java ?Core Java
Ans. Type erasure applies to the use of generics. When generics are used, they're pre compiled into compile time checks and execution-time casts.

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   Like         Discuss         Correct / Improve     type erasures  generics     Asked in 2 Companies      intermediate        rare

 Q78. How can one determine if JVM is 32-bit or 64-bit from Java Program ?Core Java
Ans. There is a Java system property "sun.arch.data.model" that can tell if JVM is 32 bit of 64 bit

System.getProperty("sun.arch.data.model") can be used to get that property.

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   Like         Discuss         Correct / Improve     jvm      intermediate        rare

 Q79. Write an Algorithm for Graph Traversal ? The Graph has a loop.Algorithm
Ans. Please not that all such questions can be easily answered through recursion.

Simple recursive implementation could be

traverse(root);

void traverse(Element element){
if(element.hasNext()){
traverse(element.next());
} else {
System.out.println(element);
}
}

but this algo / code lead to endless loop if there is a loop in graph traversal.

So you can keep a collection to keep track of which elements have laready been traversed


static List<Elements> listOfAlreadyTraversedElements = new ArrayList<Elements>();

main(){
traverse(root);
}

void traverse(Element element){
if(element.hasNext()){
traverse(element.next());
} else {
listOfAlreadyTraversedElements.add(element);
System.out.println(element);
}
}

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   Like         Discuss         Correct / Improve     graph traversal algorithm  graph traversal algorithm using recursion     Asked in 1 Companies      intermediate

Frequently asked in Alibaba (Based on 2 feedback)
 Q80. What is the best Memory setting for JVM ?Core Java
Ans. In Java JVM memory settings is done by use the arguments -Xms -Xmx. Use M or G after the numbers for indicating Megs and Gigs of bytes respectively. -Xms indicates the minimum and -Xmx the maximum.

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   Like         Discuss         Correct / Improve     jvm  memory management  jvm best memory setting     Asked in 1 Companies      intermediate

Frequently asked in high end product companies.
 Q81. Write code for LRU CacheCore Java
Ans. https://www.geeksforgeeks.org/lru-cache-implementation/

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   Like         Discuss         Correct / Improve     cache  LRU cache  coding  code     Asked in 10 Companies      intermediate

 Q82. Will finally run if we have return statement and it exits the method early ?Core Java
Ans. finally will execute in all graceful situations - graceful executions as well as graceful exceptions. The only situation when finally block won't execute is when the app is abruptly stopped, killed or unplugged.

  Sample Code for finally

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   Like         Discuss         Correct / Improve     finally      Intermediate

 Q83. What is nested interface?Core Java
Ans. Interface that is declared inside the interface or class, is known as nested interface. It is static by default.

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 Q84. What kind of thread is garbage collection thread ?Core Java
Ans. Daemon thread

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   Like         Discuss         Correct / Improve     garbage collection      intermediate
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 Q85. What is the difference between the Reader/Writer java.io hierarchy and the Stream class hierarchy?Core Java
Ans. The Reader/Writer hierarchy is character oriented, whereas the Stream class hierarchy is byte oriented.

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   Like         Discuss         Correct / Improve     java io  streams      intermediate

 Q86. What is an IO Filter ?Core Java
Ans. It's an object that reads from one stream and writes to another.

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   Like         Discuss         Correct / Improve     java io  io filter      intermediate

 Q87. Can we convert a numeric IP address to a web host name ?Java EE
Ans. Yes, using InetAddress.getByName("<IP Address>").getHostName();

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   Like         Discuss         Correct / Improve     ip address to hostname  INETAddress      intermediate

 Q88. how to access the methods of an inner class?Core Java
Ans. It depends on the type of inner class

To access non static inner class method

new OuterClass().new InnerClass().getMethod();

To access static method of static inner class

new OuterClass.InnerClass().getMethod();

  Sample Code for inner class

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   Like         Discuss         Correct / Improve     inner classes  nested aclasses     Asked in 1 Companies      Intermediate        frequent

 Q89. What is memory leak ? How Java helps countering memory leaks compared to C++ ?Core Java
Ans. Memory Leak is a situation wherein we have a reserved memory location but the program has lost its reference and hence has no way to access it.

Java doesn't have concept of Pointers, Moreover Java has concept of Garbage collection that frees up space in heap that has lost its references.

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   Like         Discuss         Correct / Improve     memory leak  garbage collection      intermediate        frequent

 Q90. What are the benefits of creating immutable objects ?Core Java
Ans. 1. Security and Safety - They can be shared across multiple threads as they are thread safe. Moreover, it protects then from bad state due to interception by the other code segment. One such problem due to mutability and access by alternate code segment could be the change of hash code and then the impact on its search with hash collections.

2. Reuse - In some cases they can be reused as only one copy would exist and hence it can be relied upon. For example - String Pool

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   Like         Discuss         Correct / Improve     immutable  immutability objects     Asked in 1 Companies      Intermediate        frequent

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