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| java.lang.Object java.lang.Thread
Thread | public class Thread implements Runnable(Code) | | A thread is a thread of execution in a program. The Java
Virtual Machine allows an application to have multiple threads of
execution running concurrently.
Every thread has a priority. Threads with higher priority are
executed in preference to threads with lower priority. Each thread
may or may not also be marked as a daemon. When code running in
some thread creates a new Thread object, the new
thread has its priority initially set equal to the priority of the
creating thread, and is a daemon thread if and only if the
creating thread is a daemon.
When a Java Virtual Machine starts up, there is usually a single
non-daemon thread (which typically calls the method named
main of some designated class). The Java Virtual
Machine continues to execute threads until either of the following
occurs:
- The
exit method of class Runtime has been
called and the security manager has permitted the exit operation
to take place.
- All threads that are not daemon threads have died, either by
returning from the call to the
run method or by
throwing an exception that propagates beyond the run
method.
There are two ways to create a new thread of execution. One is to
declare a class to be a subclass of Thread . This
subclass should override the run method of class
Thread . An instance of the subclass can then be
allocated and started. For example, a thread that computes primes
larger than a stated value could be written as follows:
class PrimeThread extends Thread {
long minPrime;
PrimeThread(long minPrime) {
this.minPrime = minPrime;
}
public void run() {
// compute primes larger than minPrime
. . .
}
}
The following code would then create a thread and start it running:
PrimeThread p = new PrimeThread(143);
p.start();
The other way to create a thread is to declare a class that
implements the Runnable interface. That class then
implements the run method. An instance of the class can
then be allocated, passed as an argument when creating
Thread , and started. The same example in this other
style looks like the following:
class PrimeRun implements Runnable {
long minPrime;
PrimeRun(long minPrime) {
this.minPrime = minPrime;
}
public void run() {
// compute primes larger than minPrime
. . .
}
}
The following code would then create a thread and start it running:
PrimeRun p = new PrimeRun(143);
new Thread(p).start();
Every thread has a name for identification purposes. More than
one thread may have the same name. If a name is not specified when
a thread is created, a new name is generated for it.
author: unascribed version: 1.184, 07/30/07 See Also: Runnable See Also: Runtime.exit(int) See Also: Thread.run() See Also: Thread.stop() since: JDK1.0 |
Inner Class :public enum State | |
Inner Class :public interface UncaughtExceptionHandler | |
Constructor Summary | |
public | Thread() Allocates a new Thread object. | public | Thread(Runnable target) Allocates a new Thread object. | public | Thread(ThreadGroup group, Runnable target) Allocates a new Thread object. | public | Thread(String name) Allocates a new Thread object. | public | Thread(ThreadGroup group, String name) Allocates a new Thread object. | public | Thread(Runnable target, String name) Allocates a new Thread object. | public | Thread(ThreadGroup group, Runnable target, String name) Allocates a new Thread object so that it has
target as its run object, has the specified
name as its name, and belongs to the thread group
referred to by group .
If group is null and there is a
security manager, the group is determined by the security manager's
getThreadGroup method. | public | Thread(ThreadGroup group, Runnable target, String name, long stackSize) Allocates a new Thread object so that it has
target as its run object, has the specified
name as its name, belongs to the thread group referred to
by group , and has the specified stack size.
This constructor is identical to
Thread.Thread(ThreadGroup,Runnable,String) with the exception of the fact
that it allows the thread stack size to be specified. |
Method Summary | |
public static int | activeCount() Returns the number of active threads in the current thread's thread
group. | void | blockedOn(Interruptible b) | final public void | checkAccess() Determines if the currently running thread has permission to
modify this thread. | native public int | countStackFrames() Counts the number of stack frames in this thread. | native public static Thread | currentThread() Returns a reference to the currently executing thread object. | public void | destroy() Throws
NoSuchMethodError . | public static void | dumpStack() Prints a stack trace of the current thread to the standard error stream.
This method is used only for debugging. | public static int | enumerate(Thread tarray) Copies into the specified array every active thread in
the current thread's thread group and its subgroups. | public static Map<Thread, StackTraceElement[]> | getAllStackTraces() Returns a map of stack traces for all live threads.
The map keys are threads and each map value is an array of
StackTraceElement that represents the stack dump
of the corresponding Thread.
The returned stack traces are in the format specified for
the
Thread.getStackTrace getStackTrace method.
The threads may be executing while this method is called.
The stack trace of each thread only represents a snapshot and
each stack trace may be obtained at different time. | public ClassLoader | getContextClassLoader() Returns the context ClassLoader for this Thread. | public static UncaughtExceptionHandler | getDefaultUncaughtExceptionHandler() Returns the default handler invoked when a thread abruptly terminates
due to an uncaught exception. | public long | getId() Returns the identifier of this Thread. | final public String | getName() Returns this thread's name. | final public int | getPriority() Returns this thread's priority. | public StackTraceElement[] | getStackTrace() Returns an array of stack trace elements representing the stack dump
of this thread. | public State | getState() Returns the state of this thread. | final public ThreadGroup | getThreadGroup() Returns the thread group to which this thread belongs. | public UncaughtExceptionHandler | getUncaughtExceptionHandler() Returns the handler invoked when this thread abruptly terminates
due to an uncaught exception. | native public static boolean | holdsLock(Object obj) Returns true if and only if the current thread holds the
monitor lock on the specified object. | public void | interrupt() Interrupts this thread.
Unless the current thread is interrupting itself, which is
always permitted, the
Thread.checkAccess() checkAccess method
of this thread is invoked, which may cause a
SecurityException to be thrown.
If this thread is blocked in an invocation of the
Object.wait wait() ,
Object.wait(long) wait(long) , or
Object.wait(longint) wait(long, int) methods of the
Object class, or of the
Thread.join() ,
Thread.join(long) ,
Thread.join(long,int) ,
Thread.sleep(long) , or
Thread.sleep(long,int) ,
methods of this class, then its interrupt status will be cleared and it
will receive an
InterruptedException .
If this thread is blocked in an I/O operation upon an
java.nio.channels.InterruptibleChannel interruptiblechannel then the channel will be closed, the thread's interrupt
status will be set, and the thread will receive a
java.nio.channels.ClosedByInterruptException .
If this thread is blocked in a
java.nio.channels.Selector then the thread's interrupt status will be set and it will return
immediately from the selection operation, possibly with a non-zero
value, just as if the selector's
java.nio.channels.Selector.wakeup wakeup method were invoked.
If none of the previous conditions hold then this thread's interrupt
status will be set. | public static boolean | interrupted() Tests whether the current thread has been interrupted. | final native public boolean | isAlive() Tests if this thread is alive. | final public boolean | isDaemon() Tests if this thread is a daemon thread. | public boolean | isInterrupted() Tests whether this thread has been interrupted. | final public synchronized void | join(long millis) Waits at most
millis milliseconds for this thread to
die. | final public synchronized void | join(long millis, int nanos) Waits at most
millis milliseconds plus
nanos nanoseconds for this thread to die.
This implementation uses a loop of
this.wait calls
conditioned on
this.isAlive . | final public void | join() Waits for this thread to die. | final public void | resume() Resumes a suspended thread.
First, the checkAccess method of this thread is called
with no arguments. | public void | run() If this thread was constructed using a separate
Runnable run object, then that
Runnable object's run method is called;
otherwise, this method does nothing and returns. | public void | setContextClassLoader(ClassLoader cl) Sets the context ClassLoader for this Thread. | final public void | setDaemon(boolean on) Marks this thread as either a
thread
or a user thread. | public static void | setDefaultUncaughtExceptionHandler(UncaughtExceptionHandler eh) Set the default handler invoked when a thread abruptly terminates
due to an uncaught exception, and no other handler has been defined
for that thread. | final public void | setName(String name) Changes the name of this thread to be equal to the argument
name . | final public void | setPriority(int newPriority) Changes the priority of this thread. | public void | setUncaughtExceptionHandler(UncaughtExceptionHandler eh) Set the handler invoked when this thread abruptly terminates
due to an uncaught exception. | native public static void | sleep(long millis) Causes the currently executing thread to sleep (temporarily cease
execution) for the specified number of milliseconds, subject to
the precision and accuracy of system timers and schedulers. | public static void | sleep(long millis, int nanos) Causes the currently executing thread to sleep (temporarily cease
execution) for the specified number of milliseconds plus the specified
number of nanoseconds, subject to the precision and accuracy of system
timers and schedulers. | public synchronized void | start() Causes this thread to begin execution; the Java Virtual Machine
calls the run method of this thread. | final public void | stop() Forces the thread to stop executing.
If there is a security manager installed, its checkAccess
method is called with this
as its argument. | final public synchronized void | stop(Throwable obj) Forces the thread to stop executing.
If there is a security manager installed, the checkAccess
method of this thread is called, which may result in a
SecurityException being raised (in the current thread). | final public void | suspend() Suspends this thread.
First, the checkAccess method of this thread is called
with no arguments. | public String | toString() Returns a string representation of this thread, including the
thread's name, priority, and thread group. | native public static void | yield() Causes the currently executing thread object to temporarily pause
and allow other threads to execute. |
MAX_PRIORITY | final public static int MAX_PRIORITY(Code) | | The maximum priority that a thread can have.
|
MIN_PRIORITY | final public static int MIN_PRIORITY(Code) | | The minimum priority that a thread can have.
|
NORM_PRIORITY | final public static int NORM_PRIORITY(Code) | | The default priority that is assigned to a thread.
|
parkBlocker | volatile Object parkBlocker(Code) | | The argument supplied to the current call to
java.util.concurrent.locks.LockSupport.park.
Set by (private) java.util.concurrent.locks.LockSupport.setBlocker
Accessed using java.util.concurrent.locks.LockSupport.getBlocker
|
Thread | public Thread()(Code) | | Allocates a new Thread object. This constructor has
the same effect as Thread(null, null,
gname) , where gname is
a newly generated name. Automatically generated names are of the
form "Thread-"+ n, where n is an integer.
See Also: Thread.Thread(ThreadGroup,Runnable,String) |
Thread | public Thread(Runnable target)(Code) | | Allocates a new Thread object. This constructor has
the same effect as Thread(null, target,
gname) , where gname is
a newly generated name. Automatically generated names are of the
form "Thread-"+ n, where n is an integer.
Parameters: target - the object whose run method is called. See Also: Thread.Thread(ThreadGroup,Runnable,String) |
Thread | public Thread(ThreadGroup group, Runnable target)(Code) | | Allocates a new Thread object. This constructor has
the same effect as Thread(group, target,
gname) , where gname is
a newly generated name. Automatically generated names are of the
form "Thread-"+ n, where n is an integer.
Parameters: group - the thread group. Parameters: target - the object whose run method is called. exception: SecurityException - if the current thread cannot create athread in the specified thread group. See Also: Thread.Thread(ThreadGroup,Runnable,String) |
Thread | public Thread(Runnable target, String name)(Code) | | Allocates a new Thread object. This constructor has
the same effect as Thread(null, target, name) .
Parameters: target - the object whose run method is called. Parameters: name - the name of the new thread. See Also: Thread.Thread(ThreadGroup,Runnable,String) |
Thread | public Thread(ThreadGroup group, Runnable target, String name)(Code) | | Allocates a new Thread object so that it has
target as its run object, has the specified
name as its name, and belongs to the thread group
referred to by group .
If group is null and there is a
security manager, the group is determined by the security manager's
getThreadGroup method. If group is
null and there is not a security manager, or the
security manager's getThreadGroup method returns
null , the group is set to be the same ThreadGroup
as the thread that is creating the new thread.
If there is a security manager, its checkAccess
method is called with the ThreadGroup as its argument.
In addition, its checkPermission
method is called with the
RuntimePermission("enableContextClassLoaderOverride")
permission when invoked directly or indirectly by the constructor
of a subclass which overrides the getContextClassLoader
or setContextClassLoader methods.
This may result in a SecurityException.
If the target argument is not null , the
run method of the target is called when
this thread is started. If the target argument is
null , this thread's run method is called
when this thread is started.
The priority of the newly created thread is set equal to the
priority of the thread creating it, that is, the currently running
thread. The method setPriority may be used to
change the priority to a new value.
The newly created thread is initially marked as being a daemon
thread if and only if the thread creating it is currently marked
as a daemon thread. The method setDaemon may be used
to change whether or not a thread is a daemon.
Parameters: group - the thread group. Parameters: target - the object whose run method is called. Parameters: name - the name of the new thread. exception: SecurityException - if the current thread cannot create athread in the specified thread group or cannotoverride the context class loader methods. See Also: Runnable.run See Also: Thread.run() See Also: Thread.setDaemon(boolean) See Also: Thread.setPriority(int) See Also: ThreadGroup.checkAccess See Also: SecurityManager.checkAccess |
Thread | public Thread(ThreadGroup group, Runnable target, String name, long stackSize)(Code) | | Allocates a new Thread object so that it has
target as its run object, has the specified
name as its name, belongs to the thread group referred to
by group , and has the specified stack size.
This constructor is identical to
Thread.Thread(ThreadGroup,Runnable,String) with the exception of the fact
that it allows the thread stack size to be specified. The stack size
is the approximate number of bytes of address space that the virtual
machine is to allocate for this thread's stack. The effect of the
stackSize parameter, if any, is highly platform dependent.
On some platforms, specifying a higher value for the
stackSize parameter may allow a thread to achieve greater
recursion depth before throwing a
StackOverflowError .
Similarly, specifying a lower value may allow a greater number of
threads to exist concurrently without throwing an
OutOfMemoryError (or other internal error). The details of
the relationship between the value of the stackSize parameter
and the maximum recursion depth and concurrency level are
platform-dependent. On some platforms, the value of the
stackSize parameter may have no effect whatsoever.
The virtual machine is free to treat the stackSize
parameter as a suggestion. If the specified value is unreasonably low
for the platform, the virtual machine may instead use some
platform-specific minimum value; if the specified value is unreasonably
high, the virtual machine may instead use some platform-specific
maximum. Likewise, the virtual machine is free to round the specified
value up or down as it sees fit (or to ignore it completely).
Specifying a value of zero for the stackSize parameter will
cause this constructor to behave exactly like the
Thread(ThreadGroup, Runnable, String) constructor.
Due to the platform-dependent nature of the behavior of this
constructor, extreme care should be exercised in its use.
The thread stack size necessary to perform a given computation will
likely vary from one JRE implementation to another. In light of this
variation, careful tuning of the stack size parameter may be required,
and the tuning may need to be repeated for each JRE implementation on
which an application is to run.
Implementation note: Java platform implementers are encouraged to
document their implementation's behavior with respect to the
stackSize parameter.
Parameters: group - the thread group. Parameters: target - the object whose run method is called. Parameters: name - the name of the new thread. Parameters: stackSize - the desired stack size for the new thread, orzero to indicate that this parameter is to be ignored. exception: SecurityException - if the current thread cannot create athread in the specified thread group. since: 1.4 |
activeCount | public static int activeCount()(Code) | | Returns the number of active threads in the current thread's thread
group.
the number of active threads in the current thread's threadgroup. |
blockedOn | void blockedOn(Interruptible b)(Code) | | |
checkAccess | final public void checkAccess()(Code) | | Determines if the currently running thread has permission to
modify this thread.
If there is a security manager, its checkAccess method
is called with this thread as its argument. This may result in
throwing a SecurityException .
exception: SecurityException - if the current thread is not allowed toaccess this thread. See Also: SecurityManager.checkAccess(Thread) |
countStackFrames | native public int countStackFrames()(Code) | | Counts the number of stack frames in this thread. The thread must
be suspended.
the number of stack frames in this thread. exception: IllegalThreadStateException - if this thread is notsuspended.Thread.suspend |
currentThread | native public static Thread currentThread()(Code) | | Returns a reference to the currently executing thread object.
the currently executing thread. |
dumpStack | public static void dumpStack()(Code) | | Prints a stack trace of the current thread to the standard error stream.
This method is used only for debugging.
See Also: Throwable.printStackTrace |
enumerate | public static int enumerate(Thread tarray)(Code) | | Copies into the specified array every active thread in
the current thread's thread group and its subgroups. This method simply
calls the enumerate method of the current thread's thread
group with the array argument.
First, if there is a security manager, that enumerate
method calls the security
manager's checkAccess method
with the thread group as its argument. This may result
in throwing a SecurityException .
Parameters: tarray - an array of Thread objects to copy to the number of threads put into the array exception: SecurityException - if a security manager exists and its checkAccess method doesn't allow the operation. See Also: ThreadGroup.enumerate(Thread[]) See Also: SecurityManager.checkAccess(ThreadGroup) |
getAllStackTraces | public static Map<Thread, StackTraceElement[]> getAllStackTraces()(Code) | | Returns a map of stack traces for all live threads.
The map keys are threads and each map value is an array of
StackTraceElement that represents the stack dump
of the corresponding Thread.
The returned stack traces are in the format specified for
the
Thread.getStackTrace getStackTrace method.
The threads may be executing while this method is called.
The stack trace of each thread only represents a snapshot and
each stack trace may be obtained at different time. A zero-length
array will be returned in the map value if the virtual machine has
no stack trace information about a thread.
If there is a security manager, then the security manager's
checkPermission method is called with a
RuntimePermission("getStackTrace") permission as well as
RuntimePermission("modifyThreadGroup") permission
to see if it is ok to get the stack trace of all threads.
a Map from Thread to an array of StackTraceElement that represents the stack trace of the corresponding thread. throws: SecurityException - if a security manager exists and its checkPermission method doesn't allow getting the stack trace of thread. See Also: Thread.getStackTrace See Also: SecurityManager.checkPermission See Also: RuntimePermission See Also: Throwable.getStackTrace since: 1.5 |
getContextClassLoader | public ClassLoader getContextClassLoader()(Code) | | Returns the context ClassLoader for this Thread. The context
ClassLoader is provided by the creator of the thread for use
by code running in this thread when loading classes and resources.
If not set, the default is the ClassLoader context of the parent
Thread. The context ClassLoader of the primordial thread is
typically set to the class loader used to load the application.
First, if there is a security manager, and the caller's class
loader is not null and the caller's class loader is not the same as or
an ancestor of the context class loader for the thread whose
context class loader is being requested, then the security manager's
checkPermission
method is called with a
RuntimePermission("getClassLoader") permission
to see if it's ok to get the context ClassLoader..
the context ClassLoader for this Thread throws: SecurityException - if a security manager exists and its checkPermission method doesn't allow getting the context ClassLoader. See Also: Thread.setContextClassLoader See Also: SecurityManager.checkPermission See Also: RuntimePermission since: 1.2 |
getDefaultUncaughtExceptionHandler | public static UncaughtExceptionHandler getDefaultUncaughtExceptionHandler()(Code) | | Returns the default handler invoked when a thread abruptly terminates
due to an uncaught exception. If the returned value is null,
there is no default.
since: 1.5 See Also: Thread.setDefaultUncaughtExceptionHandler |
getId | public long getId()(Code) | | Returns the identifier of this Thread. The thread ID is a positive
long number generated when this thread was created.
The thread ID is unique and remains unchanged during its lifetime.
When a thread is terminated, this thread ID may be reused.
this thread's ID. since: 1.5 |
getPriority | final public int getPriority()(Code) | | Returns this thread's priority.
this thread's priority. See Also: Thread.setPriority |
getStackTrace | public StackTraceElement[] getStackTrace()(Code) | | Returns an array of stack trace elements representing the stack dump
of this thread. This method will return a zero-length array if
this thread has not started, has started but has not yet been
scheduled to run by the system, or has terminated.
If the returned array is of non-zero length then the first element of
the array represents the top of the stack, which is the most recent
method invocation in the sequence. The last element of the array
represents the bottom of the stack, which is the least recent method
invocation in the sequence.
If there is a security manager, and this thread is not
the current thread, then the security manager's
checkPermission method is called with a
RuntimePermission("getStackTrace") permission
to see if it's ok to get the stack trace.
Some virtual machines may, under some circumstances, omit one
or more stack frames from the stack trace. In the extreme case,
a virtual machine that has no stack trace information concerning
this thread is permitted to return a zero-length array from this
method.
an array of StackTraceElement, each represents one stack frame. throws: SecurityException - if a security manager exists and its checkPermission method doesn't allow getting the stack trace of thread. See Also: SecurityManager.checkPermission See Also: RuntimePermission See Also: Throwable.getStackTrace since: 1.5 |
getState | public State getState()(Code) | | Returns the state of this thread.
This method is designed for use in monitoring of the system state,
not for synchronization control.
this thread's state. since: 1.5 |
getThreadGroup | final public ThreadGroup getThreadGroup()(Code) | | Returns the thread group to which this thread belongs.
This method returns null if this thread has died
(been stopped).
this thread's thread group. |
getUncaughtExceptionHandler | public UncaughtExceptionHandler getUncaughtExceptionHandler()(Code) | | Returns the handler invoked when this thread abruptly terminates
due to an uncaught exception. If this thread has not had an
uncaught exception handler explicitly set then this thread's
ThreadGroup object is returned, unless this thread
has terminated, in which case null is returned.
since: 1.5 |
holdsLock | native public static boolean holdsLock(Object obj)(Code) | | Returns true if and only if the current thread holds the
monitor lock on the specified object.
This method is designed to allow a program to assert that
the current thread already holds a specified lock:
assert Thread.holdsLock(obj);
Parameters: obj - the object on which to test lock ownership throws: NullPointerException - if obj is null true if the current thread holds the monitor lock onthe specified object. since: 1.4 |
interrupt | public void interrupt()(Code) | | Interrupts this thread.
Unless the current thread is interrupting itself, which is
always permitted, the
Thread.checkAccess() checkAccess method
of this thread is invoked, which may cause a
SecurityException to be thrown.
If this thread is blocked in an invocation of the
Object.wait wait() ,
Object.wait(long) wait(long) , or
Object.wait(longint) wait(long, int) methods of the
Object class, or of the
Thread.join() ,
Thread.join(long) ,
Thread.join(long,int) ,
Thread.sleep(long) , or
Thread.sleep(long,int) ,
methods of this class, then its interrupt status will be cleared and it
will receive an
InterruptedException .
If this thread is blocked in an I/O operation upon an
java.nio.channels.InterruptibleChannel interruptiblechannel then the channel will be closed, the thread's interrupt
status will be set, and the thread will receive a
java.nio.channels.ClosedByInterruptException .
If this thread is blocked in a
java.nio.channels.Selector then the thread's interrupt status will be set and it will return
immediately from the selection operation, possibly with a non-zero
value, just as if the selector's
java.nio.channels.Selector.wakeup wakeup method were invoked.
If none of the previous conditions hold then this thread's interrupt
status will be set.
Interrupting a thread that is not alive need not have any effect.
throws: SecurityException - if the current thread cannot modify this thread |
interrupted | public static boolean interrupted()(Code) | | Tests whether the current thread has been interrupted. The
interrupted status of the thread is cleared by this method. In
other words, if this method were to be called twice in succession, the
second call would return false (unless the current thread were
interrupted again, after the first call had cleared its interrupted
status and before the second call had examined it).
A thread interruption ignored because a thread was not alive
at the time of the interrupt will be reflected by this method
returning false.
true if the current thread has been interrupted;false otherwise. See Also: Thread.isInterrupted() |
isAlive | final native public boolean isAlive()(Code) | | Tests if this thread is alive. A thread is alive if it has
been started and has not yet died.
true if this thread is alive;false otherwise. |
isDaemon | final public boolean isDaemon()(Code) | | Tests if this thread is a daemon thread.
true if this thread is a daemon thread;false otherwise. See Also: Thread.setDaemon(boolean) |
isInterrupted | public boolean isInterrupted()(Code) | | Tests whether this thread has been interrupted. The interrupted
status of the thread is unaffected by this method.
A thread interruption ignored because a thread was not alive
at the time of the interrupt will be reflected by this method
returning false.
true if this thread has been interrupted;false otherwise. See Also: Thread.interrupted() |
join | final public synchronized void join(long millis) throws InterruptedException(Code) | | Waits at most
millis milliseconds for this thread to
die. A timeout of
0 means to wait forever.
This implementation uses a loop of
this.wait calls
conditioned on
this.isAlive . As a thread terminates the
this.notifyAll method is invoked. It is recommended that
applications not use
wait ,
notify , or
notifyAll on
Thread instances.
Parameters: millis - the time to wait in milliseconds throws: IllegalArgumentException - if the value of millis is negative throws: InterruptedException - if any thread has interrupted the current thread. Theinterrupted status of the current thread iscleared when this exception is thrown. |
join | final public synchronized void join(long millis, int nanos) throws InterruptedException(Code) | | Waits at most
millis milliseconds plus
nanos nanoseconds for this thread to die.
This implementation uses a loop of
this.wait calls
conditioned on
this.isAlive . As a thread terminates the
this.notifyAll method is invoked. It is recommended that
applications not use
wait ,
notify , or
notifyAll on
Thread instances.
Parameters: millis - the time to wait in milliseconds Parameters: nanos - 0-999999 additional nanoseconds to wait throws: IllegalArgumentException - if the value of millis is negative, or the valueof nanos is not in the range 0-999999 throws: InterruptedException - if any thread has interrupted the current thread. Theinterrupted status of the current thread iscleared when this exception is thrown. |
join | final public void join() throws InterruptedException(Code) | | Waits for this thread to die.
An invocation of this method behaves in exactly the same
way as the invocation
(0)
throws: InterruptedException - if any thread has interrupted the current thread. Theinterrupted status of the current thread iscleared when this exception is thrown. |
resume | final public void resume()(Code) | | Resumes a suspended thread.
First, the checkAccess method of this thread is called
with no arguments. This may result in throwing a
SecurityException (in the current thread).
If the thread is alive but suspended, it is resumed and is
permitted to make progress in its execution.
exception: SecurityException - if the current thread cannot modify thisthread. See Also: Thread.checkAccess See Also: Thread.suspend()Thread.suspend |
setContextClassLoader | public void setContextClassLoader(ClassLoader cl)(Code) | | Sets the context ClassLoader for this Thread. The context
ClassLoader can be set when a thread is created, and allows
the creator of the thread to provide the appropriate class loader
to code running in the thread when loading classes and resources.
First, if there is a security manager, its checkPermission
method is called with a
RuntimePermission("setContextClassLoader") permission
to see if it's ok to set the context ClassLoader..
Parameters: cl - the context ClassLoader for this Thread exception: SecurityException - if the current thread cannot set the context ClassLoader. See Also: Thread.getContextClassLoader See Also: SecurityManager.checkPermission See Also: RuntimePermission since: 1.2 |
setDaemon | final public void setDaemon(boolean on)(Code) | | Marks this thread as either a
thread
or a user thread. The Java Virtual Machine exits when the only
threads running are all daemon threads.
This method must be invoked before the thread is started.
Parameters: on - if true , marks this thread as a daemon thread throws: IllegalThreadStateException - if this thread is throws: SecurityException - if Thread.checkAccess determines that the currentthread cannot modify this thread |
setDefaultUncaughtExceptionHandler | public static void setDefaultUncaughtExceptionHandler(UncaughtExceptionHandler eh)(Code) | | Set the default handler invoked when a thread abruptly terminates
due to an uncaught exception, and no other handler has been defined
for that thread.
Uncaught exception handling is controlled first by the thread, then
by the thread's
ThreadGroup object and finally by the default
uncaught exception handler. If the thread does not have an explicit
uncaught exception handler set, and the thread's thread group
(including parent thread groups) does not specialize its
uncaughtException method, then the default handler's
uncaughtException method will be invoked.
By setting the default uncaught exception handler, an application
can change the way in which uncaught exceptions are handled (such as
logging to a specific device, or file) for those threads that would
already accept whatever "default" behavior the system
provided.
Note that the default uncaught exception handler should not usually
defer to the thread's ThreadGroup object, as that could cause
infinite recursion.
Parameters: eh - the object to use as the default uncaught exception handler.If null then there is no default handler. throws: SecurityException - if a security manager is present and itdenies RuntimePermission("setDefaultUncaughtExceptionHandler") See Also: Thread.setUncaughtExceptionHandler See Also: Thread.getUncaughtExceptionHandler See Also: ThreadGroup.uncaughtException since: 1.5 |
setName | final public void setName(String name)(Code) | | Changes the name of this thread to be equal to the argument
name .
First the checkAccess method of this thread is called
with no arguments. This may result in throwing a
SecurityException .
Parameters: name - the new name for this thread. exception: SecurityException - if the current thread cannot modify thisthread. See Also: Thread.getName See Also: Thread.checkAccess() |
setUncaughtExceptionHandler | public void setUncaughtExceptionHandler(UncaughtExceptionHandler eh)(Code) | | Set the handler invoked when this thread abruptly terminates
due to an uncaught exception.
A thread can take full control of how it responds to uncaught
exceptions by having its uncaught exception handler explicitly set.
If no such handler is set then the thread's ThreadGroup
object acts as its handler.
Parameters: eh - the object to use as this thread's uncaught exceptionhandler. If null then this thread has no explicit handler. throws: SecurityException - if the current thread is not allowed tomodify this thread. See Also: Thread.setDefaultUncaughtExceptionHandler See Also: ThreadGroup.uncaughtException since: 1.5 |
sleep | native public static void sleep(long millis) throws InterruptedException(Code) | | Causes the currently executing thread to sleep (temporarily cease
execution) for the specified number of milliseconds, subject to
the precision and accuracy of system timers and schedulers. The thread
does not lose ownership of any monitors.
Parameters: millis - the length of time to sleep in milliseconds throws: IllegalArgumentException - if the value of millis is negative throws: InterruptedException - if any thread has interrupted the current thread. Theinterrupted status of the current thread iscleared when this exception is thrown. |
sleep | public static void sleep(long millis, int nanos) throws InterruptedException(Code) | | Causes the currently executing thread to sleep (temporarily cease
execution) for the specified number of milliseconds plus the specified
number of nanoseconds, subject to the precision and accuracy of system
timers and schedulers. The thread does not lose ownership of any
monitors.
Parameters: millis - the length of time to sleep in milliseconds Parameters: nanos - 0-999999 additional nanoseconds to sleep throws: IllegalArgumentException - if the value of millis is negative, or the value of nanos is not in the range 0-999999 throws: InterruptedException - if any thread has interrupted the current thread. The interrupted status of the current thread is cleared when this exception is thrown. |
start | public synchronized void start()(Code) | | Causes this thread to begin execution; the Java Virtual Machine
calls the run method of this thread.
The result is that two threads are running concurrently: the
current thread (which returns from the call to the
start method) and the other thread (which executes its
run method).
It is never legal to start a thread more than once.
In particular, a thread may not be restarted once it has completed
execution.
exception: IllegalThreadStateException - if the thread was alreadystarted. See Also: Thread.run() See Also: Thread.stop() |
stop | final public void stop()(Code) | | Forces the thread to stop executing.
If there is a security manager installed, its checkAccess
method is called with this
as its argument. This may result in a
SecurityException being raised (in the current thread).
If this thread is different from the current thread (that is, the current
thread is trying to stop a thread other than itself), the
security manager's checkPermission method (with a
RuntimePermission("stopThread") argument) is called in
addition.
Again, this may result in throwing a
SecurityException (in the current thread).
The thread represented by this thread is forced to stop whatever
it is doing abnormally and to throw a newly created
ThreadDeath object as an exception.
It is permitted to stop a thread that has not yet been started.
If the thread is eventually started, it immediately terminates.
An application should not normally try to catch
ThreadDeath unless it must do some extraordinary
cleanup operation (note that the throwing of
ThreadDeath causes finally clauses of
try statements to be executed before the thread
officially dies). If a catch clause catches a
ThreadDeath object, it is important to rethrow the
object so that the thread actually dies.
The top-level error handler that reacts to otherwise uncaught
exceptions does not print out a message or otherwise notify the
application if the uncaught exception is an instance of
ThreadDeath .
exception: SecurityException - if the current thread cannot modify this thread. See Also: Thread.interrupt() See Also: Thread.checkAccess() See Also: Thread.run() See Also: Thread.start() See Also: ThreadDeath See Also: ThreadGroup.uncaughtException(ThreadThrowable) See Also: SecurityManager.checkAccess(Thread) See Also: SecurityManager.checkPermission |
stop | final public synchronized void stop(Throwable obj)(Code) | | Forces the thread to stop executing.
If there is a security manager installed, the checkAccess
method of this thread is called, which may result in a
SecurityException being raised (in the current thread).
If this thread is different from the current thread (that is, the current
thread is trying to stop a thread other than itself) or
obj is not an instance of ThreadDeath , the
security manager's checkPermission method (with the
RuntimePermission("stopThread") argument) is called in
addition.
Again, this may result in throwing a
SecurityException (in the current thread).
If the argument obj is null, a
NullPointerException is thrown (in the current thread).
The thread represented by this thread is forced to stop
whatever it is doing abnormally and to throw the
Throwable object obj as an exception. This
is an unusual action to take; normally, the stop method
that takes no arguments should be used.
It is permitted to stop a thread that has not yet been started.
If the thread is eventually started, it immediately terminates.
Parameters: obj - the Throwable object to be thrown. exception: SecurityException - if the current thread cannot modifythis thread. throws: NullPointerException - if obj is null. See Also: Thread.interrupt() See Also: Thread.checkAccess() See Also: Thread.run() See Also: Thread.start() See Also: Thread.stop() See Also: SecurityManager.checkAccess(Thread) See Also: SecurityManager.checkPermissionThread.stop() |
suspend | final public void suspend()(Code) | | Suspends this thread.
First, the checkAccess method of this thread is called
with no arguments. This may result in throwing a
SecurityException (in the current thread).
If the thread is alive, it is suspended and makes no further
progress unless and until it is resumed.
exception: SecurityException - if the current thread cannot modifythis thread. See Also: Thread.checkAccess |
toString | public String toString()(Code) | | Returns a string representation of this thread, including the
thread's name, priority, and thread group.
a string representation of this thread. |
yield | native public static void yield()(Code) | | Causes the currently executing thread object to temporarily pause
and allow other threads to execute.
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