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Java.lang.ThreadGroup Class

Introduction

The java.lang.ThreadGroup class represents a set of threads. It can also include other thread groups. The thread groups form a tree in which every thread group except the initial thread group has a parent.

Class declaration

Following is the declaration for java.lang.ThreadGroup class:

public class ThreadGroup
   extends Object
   implements Thread.UncaughtExceptionHandler

Class constructors

S.N.Constructor & Description
1ThreadGroup(String name)

This constructs a new thread group.

2ThreadGroup(ThreadGroup parent, String name)

This creates a new thread group.

Class methods

S.N.Method & Description
1int activeCount()

This method returns an estimate of the number of active threads in this thread group.

2int activeGroupCount()

This method returns an estimate of the number of active groups in this thread group.

3void checkAccess()

This method determines if the currently running thread has permission to modify this thread group.

4void destroy()

This method Destroys this thread group and all of its subgroups.

5int enumerate(Thread[] list)

This method Copies into the specified array every active thread in this thread group and its subgroups.

6int enumerate(Thread[] list, boolean recurse)

This method copies into the specified array every active thread in this thread group.

7int enumerate(ThreadGroup[] list)

This method copies into the specified array references to every active subgroup in this thread group.

8int enumerate(ThreadGroup[] list, boolean recurse)

This method copies into the specified array references to every active subgroup in this thread group.

9int getMaxPriority()

This method returns the maximum priority of this thread group.

10String getName()

This method returns the name of this thread group.

11ThreadGroup getParent()

This method returns the parent of this thread group.

12void interrupt()

This method interrupts all threads in this thread group.

13boolean isDaemon()

This method Tests if this thread group is a daemon thread group.

14boolean isDestroyed()

This method tests if this thread group has been destroyed.

15void list()

This method prints information about this thread group to the standard output.

16boolean parentOf(ThreadGroup g)

This method tests if this thread group is either the thread group argument or one of its ancestor thread groups.

17void setDaemon(boolean daemon)

This method changes the daemon status of this thread group.

18void setMaxPriority(int pri)

This method sets the maximum priority of the group.

19String toString()

This method returns a string representation of this Thread group.

20void uncaughtException(Thread t, Throwable e)

This method called by the Java Virtual Machine when a thread in this thread group stops because of an uncaught exception, and the thread does not have a specific Thread.UncaughtExceptionHandler installed.

Methods inherited

This class inherits methods from the following classes:

  • java.lang.Object

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