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Android Reference

ThreadGroup


java.lang

Class ThreadGroup

    • Constructor Summary

      Constructors
      Constructor and Description
      ThreadGroup(String name)
      Constructs a new ThreadGroup with the given name.
      ThreadGroup(ThreadGroup parent, String name)
      Constructs a new ThreadGroup with the given name, as a child of the given ThreadGroup.
    • Method Summary

      Methods
      Modifier and Type Method and Description
      int activeCount()
      Returns the number of running Threads which are children of this thread group, directly or indirectly.
      int activeGroupCount()
      Returns the number of ThreadGroups which are children of this group, directly or indirectly.
      boolean allowThreadSuspension(boolean b)
      Deprecated.
      Required deprecated method suspend().
      void checkAccess()
      Does nothing.
      void destroy()
      Destroys this thread group and recursively all its subgroups.
      int enumerate(Thread[] threads)
      Iterates over all active threads in this group (and its sub-groups) and stores the threads in the given array.
      int enumerate(Thread[] threads, boolean recurse)
      Iterates over all active threads in this group (and, optionally, its sub-groups) and stores the threads in the given array.
      int enumerate(ThreadGroup[] groups)
      Iterates over all thread groups in this group (and its sub-groups) and and stores the groups in the given array.
      int enumerate(ThreadGroup[] groups, boolean recurse)
      Iterates over all thread groups in this group (and, optionally, its sub-groups) and stores the groups in the given array.
      int getMaxPriority()
      Returns the maximum allowed priority for a Thread in this thread group.
      String getName()
      Returns the name of this thread group.
      ThreadGroup getParent()
      Returns this thread group's parent ThreadGroup.
      void interrupt()
      Interrupts every Thread in this group and recursively in all its subgroups.
      boolean isDaemon()
      Checks whether this thread group is a daemon ThreadGroup.
      boolean isDestroyed()
      Checks whether this thread group has already been destroyed.
      void list()
      Outputs to System.out a text representation of the hierarchy of Threads and ThreadGroups in this thread group (and recursively).
      boolean parentOf(ThreadGroup g)
      Checks whether this thread group is a direct or indirect parent group of a given ThreadGroup.
      void resume()
      Deprecated.
      Requires deprecated method Thread.resume().
      void setDaemon(boolean isDaemon)
      Sets whether this is a daemon ThreadGroup or not.
      void setMaxPriority(int newMax)
      Configures the maximum allowed priority for a Thread in this group and recursively in all its subgroups.
      void stop()
      Deprecated.
      Requires deprecated method Thread.stop().
      void suspend()
      Deprecated.
      Requires deprecated method Thread.suspend().
      String toString()
      Returns a string containing a concise, human-readable description of this object.
      void uncaughtException(Thread t, Throwable e)
      Handles uncaught exceptions.
    • Constructor Detail

      • ThreadGroup

        public ThreadGroup(String name)
        Constructs a new ThreadGroup with the given name. The new ThreadGroup will be child of the ThreadGroup to which the calling thread belongs.
        Parameters:
        name - the name
        See Also:
        Thread.currentThread()
    • Method Detail

      • activeCount

        public int activeCount()
        Returns the number of running Threads which are children of this thread group, directly or indirectly.
        Returns:
        the number of children
      • activeGroupCount

        public int activeGroupCount()
        Returns the number of ThreadGroups which are children of this group, directly or indirectly.
        Returns:
        the number of children
      • allowThreadSuspension

        @Deprecated
        public boolean allowThreadSuspension(boolean b)
        Deprecated. Required deprecated method suspend().
        Does nothing. The definition of this method depends on the deprecated method suspend(). The exact behavior of this call was never specified.
        Parameters:
        b - Used to control low memory implicit suspension
        Returns:
        true (always)
      • checkAccess

        public final void checkAccess()
        Does nothing.
      • destroy

        public final void destroy()
        Destroys this thread group and recursively all its subgroups. It is only legal to destroy a ThreadGroup that has no threads in it. Any daemon ThreadGroup is destroyed automatically when it becomes empty (no threads or thread groups in it).
        Throws:
        IllegalThreadStateException - if this thread group or any of its subgroups has been destroyed already or if it still contains threads.
      • enumerate

        public int enumerate(Thread[] threads)
        Iterates over all active threads in this group (and its sub-groups) and stores the threads in the given array. Returns when the array is full or no more threads remain, whichever happens first.

        Note that this method will silently ignore any threads that don't fit in the supplied array.

        Parameters:
        threads - the array into which the Threads will be copied
        Returns:
        the number of Threads that were copied
      • enumerate

        public int enumerate(Thread[] threads,
                    boolean recurse)
        Iterates over all active threads in this group (and, optionally, its sub-groups) and stores the threads in the given array. Returns when the array is full or no more threads remain, whichever happens first.

        Note that this method will silently ignore any threads that don't fit in the supplied array.

        Parameters:
        threads - the array into which the Threads will be copied
        recurse - indicates whether Threads in subgroups should be recursively copied as well
        Returns:
        the number of Threads that were copied
      • enumerate

        public int enumerate(ThreadGroup[] groups)
        Iterates over all thread groups in this group (and its sub-groups) and and stores the groups in the given array. Returns when the array is full or no more groups remain, whichever happens first.

        Note that this method will silently ignore any thread groups that don't fit in the supplied array.

        Parameters:
        groups - the array into which the ThreadGroups will be copied
        Returns:
        the number of ThreadGroups that were copied
      • enumerate

        public int enumerate(ThreadGroup[] groups,
                    boolean recurse)
        Iterates over all thread groups in this group (and, optionally, its sub-groups) and stores the groups in the given array. Returns when the array is full or no more groups remain, whichever happens first.

        Note that this method will silently ignore any thread groups that don't fit in the supplied array.

        Parameters:
        groups - the array into which the ThreadGroups will be copied
        recurse - indicates whether ThreadGroups in subgroups should be recursively copied as well or not
        Returns:
        the number of ThreadGroups that were copied
      • getMaxPriority

        public final int getMaxPriority()
        Returns the maximum allowed priority for a Thread in this thread group.
        Returns:
        the maximum priority
        See Also:
        setMaxPriority(int)
      • getName

        public final String getName()
        Returns the name of this thread group.
        Returns:
        the group's name
      • getParent

        public final ThreadGroup getParent()
        Returns this thread group's parent ThreadGroup. It can be null if this is the the root ThreadGroup.
        Returns:
        the parent
      • interrupt

        public final void interrupt()
        Interrupts every Thread in this group and recursively in all its subgroups.
        See Also:
        Thread.interrupt()
      • isDaemon

        public final boolean isDaemon()
        Checks whether this thread group is a daemon ThreadGroup.
        Returns:
        true if this thread group is a daemon ThreadGroup
        See Also:
        setDaemon(boolean), destroy()
      • isDestroyed

        public boolean isDestroyed()
        Checks whether this thread group has already been destroyed.
        Returns:
        true if this thread group has already been destroyed
        See Also:
        destroy()
      • list

        public void list()
        Outputs to System.out a text representation of the hierarchy of Threads and ThreadGroups in this thread group (and recursively). Proper indentation is used to show the nesting of groups inside groups and threads inside groups.
      • parentOf

        public final boolean parentOf(ThreadGroup g)
        Checks whether this thread group is a direct or indirect parent group of a given ThreadGroup.
        Parameters:
        g - the potential child ThreadGroup
        Returns:
        true if this thread group is parent of g
      • resume

        @Deprecated
        public final void resume()
        Deprecated. Requires deprecated method Thread.resume().
        Resumes every thread in this group and recursively in all its subgroups.
        See Also:
        Thread.resume(), suspend()
      • setDaemon

        public final void setDaemon(boolean isDaemon)
        Sets whether this is a daemon ThreadGroup or not. Daemon thread groups are automatically destroyed when they become empty.
        Parameters:
        isDaemon - the new value
        See Also:
        isDaemon, destroy()
      • setMaxPriority

        public final void setMaxPriority(int newMax)
        Configures the maximum allowed priority for a Thread in this group and recursively in all its subgroups.

        A caller can never increase the maximum priority of a thread group. Such an attempt will not result in an exception, it will simply leave the thread group with its current maximum priority.

        Parameters:
        newMax - the new maximum priority to be set
        Throws:
        IllegalArgumentException - if the new priority is greater than Thread.MAX_PRIORITY or less than Thread.MIN_PRIORITY
        See Also:
        getMaxPriority()
      • suspend

        @Deprecated
        public final void suspend()
        Deprecated. Requires deprecated method Thread.suspend().
        Suspends every thread in this group and recursively in all its subgroups.
        See Also:
        Thread.suspend(), resume()
      • toString

        public String toString()
        Description copied from class: Object
        Returns a string containing a concise, human-readable description of this object. Subclasses are encouraged to override this method and provide an implementation that takes into account the object's type and data. The default implementation is equivalent to the following expression:
           getClass().getName() + '@' + Integer.toHexString(hashCode())

        See Writing a useful toString method if you intend implementing your own toString method.

        Overrides:
        toString in class Object
        Returns:
        a printable representation of this object.


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