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Java Source | 2000-05-25 | 3.3 KB | 92 lines |
- //: TestAccess.java
- //////////////////////////////////////////////////
- // Copyright (c) Bruce Eckel, 1998
- // Source code file from the book "Thinking in Java"
- // All rights reserved EXCEPT as allowed by the
- // following statements: You can freely use this file
- // for your own work (personal or commercial),
- // including modifications and distribution in
- // executable form only. Permission is granted to use
- // this file in classroom situations, including its
- // use in presentation materials, as long as the book
- // "Thinking in Java" is cited as the source.
- // Except in classroom situations, you cannot copy
- // and distribute this code; instead, the sole
- // distribution point is http://www.BruceEckel.com
- // (and official mirror sites) where it is
- // freely available. You cannot remove this
- // copyright and notice. You cannot distribute
- // modified versions of the source code in this
- // package. You cannot use this file in printed
- // media without the express permission of the
- // author. Bruce Eckel makes no representation about
- // the suitability of this software for any purpose.
- // It is provided "as is" without express or implied
- // warranty of any kind, including any implied
- // warranty of merchantability, fitness for a
- // particular purpose or non-infringement. The entire
- // risk as to the quality and performance of the
- // software is with you. Bruce Eckel and the
- // publisher shall not be liable for any damages
- // suffered by you or any third party as a result of
- // using or distributing software. In no event will
- // Bruce Eckel or the publisher be liable for any
- // lost revenue, profit, or data, or for direct,
- // indirect, special, consequential, incidental, or
- // punitive damages, however caused and regardless of
- // the theory of liability, arising out of the use of
- // or inability to use software, even if Bruce Eckel
- // and the publisher have been advised of the
- // possibility of such damages. Should the software
- // prove defective, you assume the cost of all
- // necessary servicing, repair, or correction. If you
- // think you've found an error, please email all
- // modified files with clearly commented changes to:
- // Bruce@EckelObjects.com. (Please use the same
- // address for non-code errors found in the book.)
- /////////////////////////////////////////////////
-
- // How threads can access other threads
- // in a parent thread group
-
- public class TestAccess {
- public static void main(String[] args) {
- ThreadGroup
- x = new ThreadGroup("x"),
- y = new ThreadGroup(x, "y"),
- z = new ThreadGroup(y, "z");
- Thread
- one = new TestThread1(x, "one"),
- two = new TestThread2(z, "two");
- }
- }
-
- class TestThread1 extends Thread {
- private int i;
- TestThread1(ThreadGroup g, String name) {
- super(g, name);
- }
- void f() {
- i++; // modify this thread
- System.out.println(getName() + " f()");
- }
- }
-
- class TestThread2 extends TestThread1 {
- TestThread2(ThreadGroup g, String name) {
- super(g, name);
- start();
- }
- public void run() {
- ThreadGroup g =
- getThreadGroup().getParent().getParent();
- g.list();
- Thread[] gAll = new Thread[g.activeCount()];
- g.enumerate(gAll);
- for(int i = 0; i < gAll.length; i++) {
- gAll[i].setPriority(Thread.MIN_PRIORITY);
- ((TestThread1)gAll[i]).f();
- }
- g.list();
- }
- } ///:~