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Java puzzle System.exit and locks

DZone's Guide to

Java puzzle System.exit and locks

· Java Zone
Free Resource

Learn how to troubleshoot and diagnose some of the most common performance issues in Java today. Brought to you in partnership with AppDynamics.

When you call System.exit() it will stop the execution of the thread at that point and not call any finally blocks.
private static final Object lock = new Object();

public static void main(String... args) {
    Runtime.getRuntime().addShutdownHook(new Thread(new Runnable() {
        @Override
        public void run() {
            System.out.println("Locking");
            synchronized (lock) {
                System.out.println("Locked");
            }
        }
    }));
    synchronized (lock) {
        System.exit(0);
    }
}
What does this program print?

Replace System.exit(0) with Thread.currentThread().stop() and run again for comparison.

 

From http://vanillajava.blogspot.com/2011/12/java-puzzle-systemexit-and-locks.html

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