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    Code Snippets: Thread Interruption

    Explain following code snippet:
    class ThreadInterrupted extends Thread {
    public void run() // called when start method executes.
    System.out.println("Inside run");
    try {
    synchronized (this) {
    System.out.println("Before calling wait");
    System.out.println("wait is called");
    } catch (InterruptedException ie) {
    System.out.println("value of interrupted():"+interrupted());
    System.out.println("Here goes printStackTrace");
    public static void main(String[] args) {
    ThreadInterrupted threadInterrupted = new ThreadInterrupted();
    threadInterrupted.start(); // control goes to run method.
    System.out.println ("Before calling interrupt()");

    Once you execute this snippet of code the output shown at console looks something like:

    Before calling interrupt() Inside run Before calling wait value of interrupted():false Here goes printStackTrace java.lang.InterruptedException at java.lang.Object.wait(Native Method) at java.lang.Object.wait(Unknown Source) at ThreadInterrupted.run (ThreadInterrupted.java:9)

    Immediately after start() method is called thread is interrupted.When execution goes inside run() method where a synchornised block of code exists it mean only a single instance of this class can access this piece of code which calls wait() method.The current object of current class invokes interrupt() methos which in turn cause InterruptedException.

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