20.21
java.lang.ThreadGroup
THE PACKAGE JAVA.LANG
20.21.2
public ThreadGroup(ThreadGroup parent, String name)
throws NullPointerExpression, SecurityException,
IllegalThreadStateException
First, the
checkAccess
 method ( 20.21.4) of the
parent
 thread group is called
with no arguments.
If
parent
 is
null
, then a
NullPointerExpression
 is thrown. If
parent
 is a
ThreadGroup
 that has been destroyed by method
destroy
 ( 20.21.11), then an
IllegalThreadStateException
 is thrown.
This constructor initializes a newly created
ThreadGroup
 object so that it has
the specified
name
 as its name and belongs to the thread group represented by
parent
.
The maximum priority for the newly created thread group is set equal to the
maximum priority of
parent
. The method
setMaxPriority
 ( 20.21.13) may be
used to change the maximum priority to a lower value.
The newly created thread group is initially marked as being a daemon thread
group if and only
parent
 is a daemon thread group. The method
setDaemon
( 20.21.15) may be used to change whether or not a thread group is a daemon
thread group.
20.21.3
public String toString()
The returned value is a concatenation of the following six strings:
The name of the class of this thread group object
  "[name="
The name ( 20.21.5) of this thread group
  ",maxpri="
The current maximum priority ( 20.21.12) for this thread group, as a decimal
numeral
  "]"
All literal characters mentioned above are from the ASCII subset of Unicode.
Overrides the
toString
 method of
Object
 ( 20.1.3).
604






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