This class represents a
group of threads and allows that group to
be manipulated as a whole. A ThreadGroup can
contain THRead objects, as well as other child
ThreadGroup objects. All
ThreadGroup objects are created as children of
some other THReadGroup, and thus there is a
parent/child hierarchy of ThreadGroup objects. Use
getParent( ) to
obtain the parent ThreadGroup, and use
activeCount( )
,
activeGroupCount( ), and the various
enumerate( ) methods to list the child
Thread and THReadGroup objects.
Most applications can simply rely on the default system thread group.
System-level code and applications such as servers that need to
create a large number of threads may find it convenient to create
their own THReadGroup objects, however. interrupt( )
interrupts all threads in the group at once. setMaxPriority(
) specifies the maximum priority any thread in the group
can have. checkAccess( ) checks whether the
calling thread has permission to modify the given thread group. The
method throws a SecurityException if the current
thread does not have access. uncaughtException( )
contains the code that is run when a thread terminates because of an
uncaught exception or error. You can customize this method by
subclassing ThreadGroup.
Figure 10-65. java.lang.ThreadGroup
 public class ThreadGroup implements Thread.UncaughtExceptionHandler {
// Public Constructors
public ThreadGroup (String name );
public ThreadGroup (ThreadGroup parent , String name );
// Public Instance Methods
public int activeCount ( );
public int activeGroupCount ( );
public final void checkAccess ( );
public final void destroy ( );
public int enumerate (ThreadGroup[ ] list );
public int enumerate (Thread[ ] list );
public int enumerate (Thread[ ] list , boolean recurse );
public int enumerate (ThreadGroup[ ] list , boolean recurse );
public final int getMaxPriority ( );
public final String getName ( );
public final ThreadGroup getParent ( );
1.2 public final void interrupt ( );
public final boolean isDaemon ( );
1.1 public boolean isDestroyed ( ); synchronized
public void list ( );
public final boolean parentOf (ThreadGroup g );
public final void setDaemon (boolean daemon );
public final void setMaxPriority (int pri );
public void uncaughtException (Thread t , Throwable e );
Implements:Thread.UncaughtExceptionHandler
// Methods Implementing Thread.UncaughtExceptionHandler
public void uncaughtException (Thread t , Throwable e );
// Public Methods Overriding Object
public String toString ( );
// Deprecated Public Methods
1.1# public boolean allowThreadSuspension (boolean b );
# public final void resume ( );
# public final void stop ( );
# public final void suspend ( );
}
Passed To
SecurityManager.checkAccess( ),
THRead.Thread( )Returned By
SecurityManager.getThreadGroup( ),
THRead.getThreadGroup( ) |
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