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Articles by Himanshu shriv
Page 2 of 5
Difference between Apache Kafka and JMS.
Kafka and JMS both are messaging system. Java message service is an api which are provided by Java. It is used for implementing messaging system in your application. JMS supports queue and publisher /subscriber(topic) messaging system . With queues, when first consumer consumes a message, message gets deleted from the queue and others cannot take it anymore. With topics, multiple consumers receive each message but it is much harder to scale.Kafka is a generalization of these two concepts - it allows scaling between members of the same consumer group, but it also allows broadcasting the same message between many different ...
Read MoreDifference between PermGen Space and MetaSpace.
PermGen is the memory area for storing class data like static variable, byte code and etc. By default 64 Mb is allocated for PermGen. It can be tuned by using -XXMaxPermSize.In Java 8, PermGen method area replaced with MetaSpace. They have moved permGem to the separate memory in the native OS and that is called MetaSpace. It can by default auto increases its size. In MetaSpace, classes can load and unload during the lifespan of the JVM.Sr. No.KeyPermGenMetaSpace1BasicPermGen is the memory area for storing class data like static variable, byte code and etcIn Java 8, PermGen method area replaced with ...
Read MoreDifference between Iterator and Spilt Iterator in Java.
Iterator and split iterator both interface are used for iterating over the collection.Split iterator is introduced in Java 8 for achieving parallelism. It can split the given set of element and can perform operation parallely using different independent threads. It can traverse the elements parallely as well as sequentially manner. There are following important methods in the splitIterator interface −trySplit - It is used for split the given set of elements into multiple pieces.tryAdvance - It is equivalent to the hasNext/ next methods available in Iterator interfacegetExactSizeIfKnown -It is used to get the size of the given set of elements.Sr. ...
Read MoreDifference between intermediate and terminal operations in Java 8
Stream is introduced in Java 8, it is only used for processing group of data not for the storting elements.. It does not modify the actual collection, they only provide the result as per the pipelined methods.Stream api supports multiple operations and operations are divided into two parts −Intermediate Operation- These operations are used to pipeline other methods and to transform into the other streams. They don’t produce results because these operation does not invoke until the terminal operation gets executed. Below are the examples −sorted(Comparator)peek(Consumer)distinct()Terminal operations - These operations are used to produce results. They can’t be used for ...
Read MoreDifference between Function and Predicate in Java 8
Function and Predicate both functional interface was introduced in Java 8 to implement functional programming in Java.Function interface is used to do the transformation.It can accepts one argument and produces a result. On the other side, Predicate can also accept only one argument but it can only return boolean value. It is used to test the condition.Sr. No.KeyFunctionPredicate1BasicIt can take 2 type parameters First one represents input type argument type and second one represents return type.It can take one type parameter which represents input type or argument type.2Return TypeIt can return any type of value.It can only return boolean value3MethodIt ...
Read MoreDifference between scheduledThread pool and Single Thread Executor.
Sr. No.KeyScheduled Thread PoolSingle Thread Executor1BasicCreates a thread pool that can schedule commands to run after a given delay, or to execute periodically. Tasks are guaranteed to execute sequentially, and no more than one task will be active at any given time2QueueIt uses Delay Queue to store tasks. Schedule the task based on time delay.It uses blocking queue.3Thread LifetimeT he number of threads to keep in the pool, even if they are idleRecreate thread if killed because of the task.4.Thread Pool SizeIt always has a single thread running.The thread pool can grow from zero threads to Integer.MAX_VALUE5.Use CaseWe should used fixedthreadpool, ...
Read MoreDifference between Fixed thread pool and cached thread pool.
Executor framework are designed using thread pool concept. Thread pool is the way to reuse the already created thread instead of creating a new thread every time to execute the current task.Executors class provides a factory method to create thread pools. The ThreadPoolExecutor class is the base implementation for the executors that are returned from many of the Executors factory methods.Sr. No.KeyFixed Thread PoolCached Thread Pool1BasicAs per Java Doc −Creates a thread pool that reuses a fixed number of threads operating off a shared unbounded queue. At any point, at most nThreads threads will be active processing tasks. If additional ...
Read MoreDifference between Executor and ExecutorServices in Java
Executor and ExecutorServices both interfaces are part of the Executor framework. It is released with Java 5. In java, thread creation is very expensive operation so we should reuse the available thread instead of starting a new thread every time and we can achieve the same using Executor framework.Executor framework use the thread pool to execute the task parallel which helps to optimize response time and resource utilization. It provides four types of built in thread pools −Fixed Thread PoolCached Thread PoolScheduled Thread PoolSingle Thread ExecutorSr. No.KeyExecutorExecutorServices1BasicIt is a parent interfaceIt extends Executor Interface2MethodIt has execute() methodIt has submit() method3Return TypeIt ...
Read MoreDifference between Runnable and Callable interface in java
Runnable and Callable both functional interface. Classes which are implementing these interfaces are designed to be executed by another thread.Thread can be started with Ruunable and they are two ways to start a new thread: one is by subclassing Thread class and another is implementing Runnable interface.Thread class does not have constructor for callable so we should use ExecutorService class for executing thread.Sr. No.KeyRunnableCallable1PackageIt belongs to Java.langIt belongs to java.util.concurrent2Thread CreationWe can create thread by passing runnable as a parameter.We can’t create thread by passing callable as parameter 3Return TypeRuunable does not return anythingCallable can return results4.MethodIt has run() methodIt ...
Read MoreDifference between Streams and Collections in Java 8
Java Collections framework is used for storing and manipulating group of data. It is an in-memory data structure and every element in the collection should be computed before it can be added in the collections.Stream API is only used for processing group of data. It does not modify the actual collection, they only provide the result as per the pipelined methods.Sr. No.KeyCollectionsStreams1BasicIt is used for storing and manipulating group of dataStream API is only used for processing group of data2PackageAll the classes and interfaces of this API is in the Java.util packageAll the classes and interfaces of this API is ...
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