Java多线程之线程结束清理

该事例说明了清理工作必须要放在finally块中

package Thread.Interrupting;

import java.util.concurrent.TimeUnit;
class NeedsCleanup {

    private final int id;
public NeedsCleanup(int ident) {

        id = ident;

        System.out.println("NeedsCleanup " + id);

    }
public void cleanup() {

        System.out.println("Cleaning up " + id);

    }

}
class Blocked3 implements Runnable {

    private volatile double d = 0.0;
@Override

    public void run() {

        try {

            while (!Thread.interrupted()) {

                NeedsCleanup n1 = new NeedsCleanup(1);

                try {

                    System.out.println("Sleeping");

                    TimeUnit.SECONDS.sleep(1);

                    // point2

                    NeedsCleanup n2 = new NeedsCleanup(2);

                    // Guarantee proper cleanup of n2:

                    try {

                        System.out.println("Calculating");

                        // A time-consuming,non-blocking operation:

                        for (int i = 0; i < 2500000; i++) {

                            d = d + (Math.PI + Math.E) / d;

                        }

                        System.out.println("Finished time-consuming operation");

                    } finally {

                        n2.cleanup();

                    }

                } finally {

                    n1.cleanup();

                }

                System.out.println("Exiting via while() test");

            }

        } catch (InterruptedException e) {

            System.out.println("Exiting via InterruptedException");

        }

    }

}
public class InterruptingIdiom {

    public static void main(String[] args) throws NumberFormatException,

            InterruptedException {

        if (args.length != 1) {

            System.out.println("usage:java InterruptingIdiom delay-in-ms");

            System.exit(1);

        }

        Thread t = new Thread(new Blocked3());

        t.start();

        TimeUnit.MILLISECONDS.sleep(new Integer(args[0]));

        t.interrupt();

    }
}

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