20.20

java.lang.Thread

THE PACKAGE JAVA.LANG

Threads.currentThread().getThreadGroup().allThreadsCount()

should be used. See the method

allThreadsCount

 of class

ThreadGroup

.]

20.20.36

public static int enumerate(Thread tarray[])

The active threads in the thread group to which the current thread belongs, includ 

ing threads in subgroups of that thread group, are enumerated and their Thread

objects are put into the array

tarray

. The number of threads actually put into the

array is returned. Call this value

n

; then the threads have been put into elements

0

through

n 1

 of

tarray

. If the number of threads exceeds the length of

tarray

,

then some of the threads,

tarray.length

 of them, are chosen arbitrarily and

used to fill the array

tarray

.

[This method is deprecated for use in new code after Java version 1.1 becomes

available. Instead, an expression equivalent to:

Threads.currentThread().getThreadGroup().allThreads()

should be used. See the method

allThreads

 of class

ThreadGroup

.]

20.20.37

public static void dumpStack()

This is a utility method that makes it easy to print a stack dump for the current

thread. It is equivalent in effect to:

new Exception("Stack trace").printStackTrace()

See the

printStackTrace

 method ( 20.22.6) of class

Throwable

.

20.20.38

public static void yield()

This method causes the current thread to yield, allowing the thread scheduler to

choose another runnable thread for execution.

20.20.39

public static void sleep(long millis)

throws InterruptedException

This method causes the current thread to yield and not to be scheduled for further

execution until a certain amount of real time has elapsed, more or less.

The amount of real time, measured in milliseconds, is given by

millis

.

If the current thread is interrupted ( 20.20.31) by another thread while it is

waiting, then the sleep is ended and an

InterruptedException

 is thrown.

600