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Category Archives: Core Java

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JVM Architecture Introduction | JVM Internals

July 26, 2017
Posted by Pumpkin

Being a java developer, it is expected from us to have basic knowledge of JVM architecture, as it enables us to write code more efficiently. Also from the interview perspective JVM architecture, Class loader subsystem, JVM memory management are frequently discussed topics with 3-5 year experienced java developer. If you are able to answer these questions, you will create good impression […]

What is the use of private constructor in java?

In Java, we can use any access modifier (i.e. public, protected or private) with constructor.  So, what are the uses of making constructor private? First thing that strikes your mind is Singleton Design Pattern which is also one of the most asked Core Java Interview Question to the 3-4 yr exp Java developers.  Apart from creating singleton class, private constructor […]

Threadpool using Executor Framework | Java Concurrency Utilities

June 30, 2017
Posted by Pumpkin

The JDK 1.5 Executor framework is a combination of various Executor interfaces and Executors utility class to provide a thread pool feature in Java.  In server side programming, Thread pool is an important concept to maintain scalability, robustness, and stability of the system.   Thread pool is a pool of worker threads, which is ready to perform any task given to them, […]

Defining and Starting a Thread | Thread VS Runnable

Java threads are objects like any other Java objects. Threads are instances of class java.lang.Thread, or instances of subclasses of this class. In addition to being objects, java threads can also execute code. Creating and Starting Threads Here is the code to create a Thread and start its execution. // Creates Thread Object Thread thread = […]

CountDownLatch Vs CyclicBarrier | Java Concurrency Utilities

CountDownLatch Vs CyclicBarrier : Though both are used as a synchronization aid that allows one or more threads to wait but there are certain differences between them that you should know in order to know when one of these utilities will serve you better.  As per the java.util.concurrent API,  CountDownLatch: A synchronization aid that allows one or more threads to […]

CyclicBarrier | Java Concurrency Utilities

May 25, 2017
Posted by Pumpkin

CyclicBarrier  was introduced in Java 5 along with other concurrent classes like CountDownLatch, ConcurrentHashMap, CopyOnWriteArrayList, BlockingQueue within java.util.Concurrent package. There are scenarios in concurrent programming when you want set of threads to wait for each other at a common point until all threads in the set have reached that common point.  The java.util.concurrent.CyclicBarrier class is a barrier that […]

final keyword in Java

May 14, 2017
Posted by Pumpkin

final is a keyword in Java. It can be used with variable, method or class. In this article we will see how we can make variable, method or class final in java and what are the advantages of doing so. If we make a method final, we can not override it in subclass.If we make […]

InterruptedException in Java Multithreading

InterruptedException is thrown when a thread is waiting, sleeping, or otherwise occupied, and the thread is interrupted, either before or during the activity. Before reading this article, I recommend you to go through my article interrupt(), interrupted() and isInterrupted() in Java Multithreading. There are some methods in JDK that check the Interrupt status flag for us and throw InterruptedException, if it […]

interrupt(), interrupted() and isInterrupted() in Java Multithreading

In this post, we will understand about interrupt(), interrupted() and  isInterrupted() methods in Java Multithreading. If you are interested in reading more about interruption mechanism you can look into our post InterruptedException in Java Multithreading. In Java, thread starts its execution when we call start() method on Thread object. It internally calls overridden run() method. Thread is said to be terminated when […]

Transient Keyword In Java

May 13, 2017
Posted by Pumpkin

The transient keyword in java is used on class attributes to indicate that serialization process of such class should ignore such attributes for any instance of that class. When JVM comes across transient keyword, it ignores original value of the variable and save default value of that variable data type. transient keyword plays an important […]

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