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Interview Questions and Answers for 'Synechron' - 25 question(s) found - Order By Newest | ||||
Very frequently asked to Fresh graduates. | ||||
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Ans. 1.Abstraction solves the problem at design level while encapsulation solves the problem at implementation level 2.Abstraction is used for hiding the unwanted data and giving relevant data. while Encapsulation means hiding the code and data into a single unit to protect the data from outside world. 3. Abstraction lets you focus on what the object does instead of how it does it while Encapsulation means hiding the internal details or mechanics of how an object does something. 4.For example: Outer Look of a Television, like it has a display screen and channel buttons to change channel it explains Abstraction but Inner Implementation detail of a Television how CRT and Display Screen are connect with each other using different circuits , it explains Encapsulation. | ||||
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Like Discuss Correct / Improve  java   oops   oops concepts   encapsulation  object oriented programming (oops)  oops concepts   abstraction   basic interview question   encapsulation vs abstraction Asked in 10 Companies basic   frequent | ||||
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Very frequently asked in companies using SOA. | ||||
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Ans. REST or Representational State Transfer is a flexible architecture style for creating web services that recommends the following guidelines - 1. http for client server communication, 2. XML / JSON as formatiing language , 3. Simple URI as address for the services and, 4. stateless communication. | ||||
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Like Discuss Correct / Improve  java   web services   rest   java   j2ee  architecture Asked in 14 Companies intermediate   frequent | ||||
Advanced level question. Recently asked in few Indian service companies ( Based on 3 inputs ) | ||||
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Ans. Bootstrap - Loads JDK internal classes, java.* packages. Extensions - Loads jar files from JDK extensions directory - usually lib/ext directory of the JRE System - Loads classes from system classpath. | ||||
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Like Discuss Correct / Improve  java   jvm   memory management   class loaders   bootstrap   extensions   system  classloaders   advanced   technical lead   technical architect Asked in 7 Companies | ||||
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Ans. There can be two different elements with the same hashcode. When two elements have the same hashcode then Java uses the equals to further differentation. So there can be one or two objects depending on the content of the objects. | ||||
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Like Discuss Correct / Improve  java   hashcode   map   hashmap   object reference   advanced Asked in 1 Companies | ||||
Very frequently asked. Usually asked in different variants like Diff between StringBuffer , String Builder ; Difference between StringBuilder and String class; Choice between these classes etc. | ||||
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Ans. A string buffer implements a mutable sequence of characters. A string buffer is like a String, but can be modified. At any point in time it contains some particular sequence of characters, but the length and content of the sequence can be changed through certain method calls. The String class represents character strings. All string literals in Java programs, such as "abc" are constant and implemented as instances of this class; their values cannot be changed after they are created. | ||||
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Like Discuss Correct / Improve  java   string   stringbuffer   frequently asked Asked in 18 Companies basic   frequent | ||||
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Ans. ConcurrentHashMap is a hashMap that allows concurrent modifications from multiple threads as there can be multiple locks on the same hashmap. | ||||
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Like Discuss Correct / Improve  java   collections   hashmap   map   concurrenthashmap   concurrenthashmap  concurrency   general electric   ge Asked in 32 Companies   rare | ||||
Frequently asked in high end product companies. Frequently asked in Deloitte. | ||||
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Ans. https://medium.com/javarevisited/internal-working-of-hashmap-in-java-97aeac3c7beb#:~:text=HashMap%20internally%20uses%20HashTable%20implementation,the%20entries%20into%20the%20map. | ||||
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Like Discuss Correct / Improve  hashmap  collections  hashmap internal implementation Asked in 20 Companies expert   frequent | ||||
Very frequently asked in phone and walk in interviews. | ||||
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Ans. An interface without any method declaration is called as marker interface. there are 3 in-built interfaces in JVM i.e. serializable, clonable, remote | ||||
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Like Discuss Correct / Improve  java   oops   interfaces   marker interface   serializable   clonable Asked in 21 Companies intermediate   frequent | ||||
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Ans. It is the process of examining / modifying the behaviour of an object at runtime. | ||||
Sample Code for reflection | ||||
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Like Discuss Correct / Improve  java   reflection   reflection api   ebay   mindtree Asked in 29 Companies basic   frequent | ||||
Usually asked to experienced developers. | ||||
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Ans. A has dependency of B, B has dependency of C and C has dependency of A With Maven 2 , came transitive dependency wherein in above scenario, C will acts as a dependency of A as if this dependency has been defined directly in A but the negative side is that if it leads to cyclic dependency , it creates problems. | ||||
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Like Discuss Correct / Improve  maven   dependencies   cyclic dependencies   transitive dependencies   build management Asked in 1 Companies   frequent | ||||
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Ans. This is the exception that is thrown when we try to modify the non concurrent collection class while iterating through it. | ||||
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Like Discuss Correct / Improve  java   collections   concurrentmodificationexception   exception  concurrency Asked in 14 Companies intermediate | ||||
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Ans. The problem with serialized singleton class is that whenever we deserialize it, it will create a new instance of the class. To overcome this scenario all we need to do is to provide the implementation of readResolve() method. | ||||
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Like Discuss Correct / Improve  singleton  serialization Asked in 1 Companies | ||||
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Ans. Class loaders are hierarchical. The very first class is specially loaded with the help of static main() method declared in your class. All the subsequently loaded classes are loaded by the classes, which are already loaded and running. | ||||
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Like Discuss Correct / Improve  java   jvm   memory management   class loaders  classloaders Asked in 1 Companies | ||||
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Ans. It's an object that can intercept http request and response and hence we can take appropriate action on those requests. There are different types of filters based on Specifications like Authentication Logging Encryption Tokenizing etc | ||||
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Like Discuss Correct / Improve  servlets  servlet filters Asked in 3 Companies basic   frequent | ||||
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Ans. Hashcode is used for bucketing in Hash implementations like HashMap, HashTable, HashSet etc. | ||||
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Like Discuss Correct / Improve  java   string   hashcode   hash code   string comparison  hashtable Asked in 17 Companies basic   frequent | ||||
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Ans. list.get(index); | ||||
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Like Discuss Correct / Improve  list Asked in 1 Companies | ||||
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Ans. 2 attempts Weigh 3 3 balls. If the weight is same then weigh the remaining two balls | ||||
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Ans. Work with two pointers on the linked list - a slow pointer (increments by one node) and a fast pointer (increments by two nodes). If both of these pointers meet at the same node, then there is a cycle in the linked list. Otherwise, no cycle. | ||||
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Like Discuss Correct / Improve  linkedlist Asked in 1 Companies | ||||
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Ans. Creating an index creates a separate table. ... Indexes are used to speed the search of data within tables. Partitions provide segregation of the data at the hdfs level, creating sub-directories for each partition. Partitioning allows the number of files read and amount of data searched in a query to be limited | ||||
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Like Discuss Correct / Improve  indexing  partitioning Asked in 3 Companies | ||||
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Ans. When you declare a member/variable as volatile, you are forcing threads to read values from main memory instead of thread memory. When you declare as atomic, the read and update/write operations are performed as a single unit. A lock is acquired during atomic operation. | ||||
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Like Discuss Correct / Improve   Asked in 2 Companies | ||||
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Ans. ConcurrentHashMaps provide unlimited read operation fro multi threaded environment. For write operation only one thread can change value for particular segment of map. | ||||
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Like Discuss Correct / Improve  ConcurrentHashMap Asked in 1 Companies | ||||
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Ans. String | ||||
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Like Discuss Correct / Improve  Code  Coding  method overloading Asked in 1 Companies | ||||
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Ans. Every fresh session having its own cache memory, Caching is a mechanism for storing the loaded objects into cache memory. The advantage of cache mechanism is, whenever again we want to load the same object from the database then instead of hitting the database once again, it loads from the local cache memory only, so that the no. of round trips between an application and a database server got decreased. It means caching mechanism increases the performance of the application. In hibernate we have two levels of caching First Level Cache [ or ] Session Cache Second Level Cache [ or ] Session Factory Cache [ or ] JVM Level Cache | ||||
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Like Discuss Correct / Improve   Asked in 23 Companies | ||||
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Ans. Init -> service -> destroy. Out of these, init and destroy are called once per servlet whereas service is called every time when a request is made to the servlet. | ||||
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Like Discuss Correct / Improve  servlet Asked in 6 Companies | ||||
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Ans. At that bucket, it will form a linked list depending on what equals method evaluates for that object. | ||||
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Like Discuss Correct / Improve  hashcode  collections Asked in 2 Companies | ||||