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Author Archives: Javin Paul

SynchronousQueue Example in Java – Producer Consumer Solution

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SynchronousQueue is special kind of BlockingQueue in which each insert operation must wait for a corresponding remove operation by another thread, and vice versa. When you call put() method on SynchronousQueue it blocks until another thread is there to take that element out of the Queue. Similarly, if a thread tries to remove an element and no element is currently ...

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Double Checked Locking on Singleton Class in Java

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Singleton class is quite common among Java developers, but it poses many challenges to junior developers. One of the key challenge they face is how to keep Singleton class as Singleton? i.e. how to prevent multiple instances of a Singleton due to whatever reasons. Double checked locking of Singleton is a way to ensure only one instance of Singleton class ...

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Why use SerialVersionUID inside Serializable class in Java

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Serialization and SerialVersionUID is always remains a puzzle for many Java developers. I often see questions like what is this SerialVersionUID, or what will happen if I don’t declare SerialVersionUID in my Serializable class? Apart from complexity involved and rare use, one more reason of these questions is Eclipse IDE’s warning against absence of SerialVersionUID e.g.“The Serializable class Customer does ...

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10 Articles Every Programmer Must Read

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Being a Java programmer and Software developer, I have learned a lot from articles titled as What Every Programmer Should Know about ….. , they tend to give a lot of useful and in-depth information about a particular topic, which otherwise is very hard to discover. In my quest of learning I have come across some very useful articles, which I ...

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How to Convert Byte Array to InputStream and OutputStream in Java

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Are you stuck with your coding because you have a byte array and next method in chain needs an InputStream? don’t worry Java has solution for that, You can use ByteArrayInputStream to convert byte array to InputStream in Java. This class takes a byte array as source and since it’s a sub-class of InputStream, you can easily pass this to ...

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Difference between State and Strategy Design Pattern in Java

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In order to make proper use of State and Strategy design Pattern in Core Java application, its important for a Java developer to clearly understand difference between them. Though both State and Strategy design patterns has similar structure, and both of them are based upon Open closed design principle, represents ‘O’ from SOLID design principles, they are totally different on ...

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10 JDK 7 Features to Revisit, Before You Welcome Java 8

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It’s been almost a month Java 8 is released and I am sure all of you are exploring new features of JDK 8. But, before you completely delve into Java 8, it’s time to revisit some of the cool features introduced on Java 7. If you remember, Java 6 was nothing on feature, it was all about JVM changes and ...

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Difference between WeakReference vs SoftReference vs PhantomReference vs Strong reference in Java

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WeakReference and SoftReference were added into Java API from long time but not every Java programmer is familiar with it. Which means there is a gap between where and how to use WeakReference and SoftReference in Java. Reference classes are particularly important in context of How Garbage collection works. As we all know that Garbage Collector reclaims memory from objects ...

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