THE PACKAGE JAVA.LANG

java.lang.Thread

20.20

20.20.21

public final ThreadGroup getThreadGroup()

If this thread is alive, this method returns a reference to the

ThreadGroup

 object

that represents the thread group to which this thread belongs. If this thread has

died (has been stopped), this method returns

null

.

20.20.22

public final int getPriority()

The current priority of this

Thread

 object is returned.

20.20.23

public final void setPriority(int newPriority)

throws SecurityException, IllegalArgumentException

First, the

checkAccess

 method ( 20.20.12) of this

Thread

 object is called with

no arguments. This may result in throwing a

SecurityException

 (in the current

thread).

If the

newPriority

 argument is less than

MIN_PRIORITY

 ( 20.20.1) or

greater than

MAX_PRIORITY

 ( 20.20.2), then an

IllegalArgumentException

 is

thrown.

Otherwise, the priority of this

Thread

 object is set to the smaller of the speci 

fied

newPriority

 and the maximum permitted priority ( 20.21.12) of the

thread's thread group ( 20.20.21).

20.20.24

public final boolean isDaemon()

The result is

true

 if and only if this thread is marked as a daemon thread.

20.20.25

public final void setDaemon(boolean on)

throws SecurityException, IllegalThreadStateException

First, the

checkAccess

 method ( 20.20.12) of this

Thread

 object is called with

no arguments. This may result in throwing a

SecurityException

 (in the current

thread).

If this thread is alive, an

IllegalThreadStateException

 is thrown. Other 

wise, this thread is marked as being a daemon thread if the argument is

true

, and

as not being a daemon thread if the argument is

false

.

597