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Java / Java Multithreading

What is Daemon thread in Java?

Daemon thread in Java are those thread which runs in background and mostly created by JVM for performing background task. A daemon thread is a thread that does not prevent the JVM from exiting when the Java program finishes but the thread is still running. An example for a daemon thread is the garbage collection.

The setDaemon(boolean) method can be used to change the Thread daemon properties before the thread starts.

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Multitasking. Multiprogramming/Multiprocessing. Basic units of execution in concurrent programming. Is concurrency possible on simple single processor systems without multiple processors? Define Processes. Define Threads. What is the default thread of every Java application? Thread Objects. When does Thread Interference occur? How do you create a Thread? Which approach is recommended? Does Thread class implements Runnable? What is the signature of Thread run() method? Define synchronization. Can a thread be interrupted when it is in sleep? Does sleep() method throws any Exception? Can the start method be called twice on the same Thread? (OR) Can the start() method invoked again on the same thread object after start() been called first time? Why do we call Thread.start() method which in turns calls run method? Consumer Producer problem. Difference between Thread.interrupted() and Thread.isInterrupted(). Give few example from Java API that throws InterruptedException. 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Difference between thread state WAIT and BLOCKED. Difference between synchronizing a static method and a non static method in Java. What is reentrant synchronization in Java? What is Reentrant lock in Java? Can a thread hold more than one lock at the same time? Difference between synchronized method and synchronized block in Java. What is Runnable in Java? Difference between start and run methods in Java Thread. Define Critical section in Java multi-threading. Explain IllegalMonitorStateException in Java multi-threading. What is Spurious Wakeups in Java threads? What is Daemon thread in Java? Difference between Daemon and Non Daemon thread in Java. Difference between a wait() and sleep() in Threads. Difference between concurrency and parallelism. Explain wait(), notify() and notifyAll() methods in Java threading. Can a thread wait on multiple objects in Java? What is mutex in Java? Explain semaphore in Java. Difference between Mutex and Semaphore in Java. 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What is FutureTask Class? What are some common problems you face in multi-thread programming? Limitations of Future. What is the enhanced version of Future (or) alternative to Future? Difference between green and native threads. More questions...
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Java Multithreading part II

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