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Java / Java Multithreading

Explain about jstack tool.

The jstack command-line utility attaches to the specified process or core file and prints the stack traces of all threads that are attached to the virtual machine, including Java threads and VM internal threads, and optionally native stack frames. The utility also performs deadlock detection.

A stack trace of all threads can be useful in diagnosing a number of issues, such as deadlocks or hangs.

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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. Thread.sleep method() Best practice for "DO Nothing" Strategy for InterruptedException. How do you interrupt an thread that does not call any method that throws InterruptedException? join() method. is join() a overloaded method? Interrupts An example for join(long milliseconds). How do you interrupt an thread that does not call any method that throws InterruptedException? Explain the interrupt mechanism. Can run() method throw exception? Difference between sleep and wait method in Java. Is ++ (increment) operator thread-safe in Java? What is thread starvation? Does pressing Control-C causes InterruptedException in Java? What is livelock in multithreading? Explain race condition in multithreading. What causes starvation in threads? Difference between deadlock and livelock in Java multithreading. What is Slipped Condition in multithreading? What is Intrinsic Lock in Java multithreading? Explain Guarded Blocks in Java. What is BLOCKED state of a thread? Different states of a Java thread. 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. Difference between notify and interrupt in Java. Difference between notify and notifyAll in Java. When the lock is released after notify/notifyAll is called? Why do we use ReentrantLock over synchronized (this)? Define Liveness in Java Thread. How threads communicate with each other? Difference between synchronized and volatile keyword in Java. Explain Thread Priority. What is Thread Scheduler? Define time slicing. Define context-switching in multi-threading. Which is preferred - Synchronized method or Synchronized block? Why wait, notify and notifyAll are declared in Object class and not in Thread class? What is Thread Group in Java? Explain setUncaughtExceptionHandler method of Java Thread class. What is Thread dump? Explain about jstack tool. How to debug and analyse Thread deadlock? Can we not override run method when we extend Thread class? Define Java thread pool. Advantages of using threadpool. What are atomic classes in Java Concurrency API? 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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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