Category: Java

  • Graphics Class in Java

     Graphics Class in Java Guys you can draw lines, shapes, characters, and images to the screen inside  your applet. Most of the graphics operations in Java are methods defined in the Graphics class. You don’t have to create an instance of Graphics in order to draw something in your applet; in your applet’s paint() method , you are […]

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  • Use of the volatile variable in java

    Volatile in Java First, you have to understand a little something about the Java memory model.The best way I can think of to describe it is if you imagine it this way pointed as below : Each thread in Java takes place in a separate memory space (this is clearly untrue, so bear with me […]

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  • Lambda Expressions in Java

    Java is a first-class object-oriented language. With the exception of primitive data types, everything in Java is an object. Even an array is an Object. Every class creates instances that are objects. There is no way of defining just a function / method which stays in Java all by itself. There is no way of […]

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  • Resource Optimization with Java SE 7

    The typical Java application manipulates several types of resources such as files, streams, sockets, and database connections. Such resource optimization must be handled with great care, because they acquire system resources for their operations. Thus, you need to ensure that they get freed even in case of errors. Indeed, incorrect resource management is a common […]

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  • Inter-thread communication

    Inter-thread communication or Co-operation is all about allowing synchronized threads to communicate with each other. Cooperation (Inter-thread communication) is a mechanism in which a thread is paused running in its critical section and another thread is allowed to enter (or lock) in the same critical section to be executed.It is implemented by following methods of […]

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  • Deadlock in java

    Deadlock in java is a part of multithreading. Deadlock can occur in a situation when a thread is waiting for an object lock, that is acquired by another thread and second thread is waiting for an object lock that is acquired by first thread. Since, both threads are waiting for each other to release the […]

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  • Static synchronization

    If you make any static method as synchronized, the lock will be on the class not on object. Problem without static synchronization Suppose there are two objects of a shared class(e.g. Table) named object1 and object2.In case of synchronized method and synchronized block there cannot be interference between t1 and t2 or t3 and t4 […]

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  • Garbage Collection

    In java, garbage means unreferenced objects. Garbage Collection is process of reclaiming the runtime unused memory automatically. Advantage of Garbage Collection: It makes java memory efficient because garbage collector removes the unreferenced objects from heap memory. It is automatically done by the garbage collector so we don’t need to make extra efforts. How can an […]

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  • Shutdown Hook

    The shutdown hook can be used to perform cleanup resource or save the state when JVM shuts down normally or abruptly. Performing clean resource means closing log file, sending some alerts or something else. So if you want to execute some code before JVM shuts down, use shutdown hook. When does the JVM shut down? […]

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  • Daemon Thread

    Daemon thread in java is a service provider thread that provides services to the user thread. Its life depend on the mercy of user threads i.e. when all the user threads dies, JVM terminates this thread automatically. There are many java daemon threads running automatically e.g. gc, finalizer etc. You can see all the detail […]

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