Class Thread

java.lang.Object

java.lang.Thread

All Implemented Interfaces:

Runnable

Direct Known Subclasses:

CodenameOneThread

public class Thread
extends Object
implements Runnable

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.

Field Summary

Fields

Modifier and Type	Field	Description
static final int	MAX_PRIORITY	The maximum priority that a thread can have.
static final int	MIN_PRIORITY	The minimum priority that a thread can have.
static final int	NORM_PRIORITY	The default priority that is assigned to a thread.

Constructor Summary

Constructors

Constructor	Description
Thread()	Allocates a new Thread object.
Thread(Runnable target)	Allocates a new Thread object with a specific target object whose run method is called.
Thread(Runnable target, String name)	Allocates a new Thread object with the given target and name.
Thread(String name)	Allocates a new Thread object with the given name.

Method Summary

Modifier and Type	Method	Description
static int	activeCount()	Returns the current number of active threads in the virtual machine.
static Thread	currentThread()	Returns a reference to the currently executing Thread object.
final String	getName()	Returns this thread's name.
final int	getPriority()	Returns this thread's priority.
StackTraceElement[]	getStackTrace()
void	interrupt()	Interrupts this thread.
final boolean	isAlive()	Tests if this thread is alive.
final void	join()	Waits for this thread to die.
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.
final void	setPriority(int newPriority)	Changes the priority of this thread.
static void	sleep(long millis)	Causes the currently executing thread to sleep (temporarily cease execution) for the specified number of milliseconds.
void	start()	Causes this thread to begin execution; the Java Virtual Machine calls the run method of this thread.
String	toString()	Returns a string representation of this thread, including the thread's name and priority.
static void	yield()	Causes the currently executing thread object to temporarily pause and allow other threads to execute.

Methods inherited from class Object

clone, equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Details

MAX_PRIORITY

public static final int MAX_PRIORITY

The maximum priority that a thread can have. See Also:Constant Field Values

See Also:

• Constant Field Values

MIN_PRIORITY

public static final int MIN_PRIORITY

The minimum priority that a thread can have. See Also:Constant Field Values

See Also:

• Constant Field Values

NORM_PRIORITY

public static final int NORM_PRIORITY

The default priority that is assigned to a thread. See Also:Constant Field Values

See Also:

• Constant Field Values

Constructor Details

Thread

public Thread()

Allocates a new Thread object. Threads created this way must have overridden their run() method to actually do anything.

Thread

public Thread(Runnable target)

Allocates a new Thread object with a specific target object whose run method is called. target - the object whose run method is called.

Thread

public Thread(Runnable target,
 String name)

Allocates a new Thread object with the given target and name. target - the object whose run method is called.name - the name of the new thread.

Thread

public Thread(String name)

Allocates a new Thread object with the given name. Threads created this way must have overridden their run() method to actually do anything. name - the name of the new thread.

Method Details

activeCount

public static int activeCount()

Returns the current number of active threads in the virtual machine.

currentThread

public static Thread currentThread()

Returns a reference to the currently executing Thread object.

getName

public final String getName()

Returns this thread's name. Note that in CLDC the name of the thread can only be set when creating the thread.

getPriority

public final int getPriority()

Returns this thread's priority.

interrupt

public void interrupt()

Interrupts this thread. In an implementation conforming to the CLDC Specification, this operation is not required to cancel or clean up any pending I/O operations that the thread may be waiting for.

isAlive

public final boolean isAlive()

Tests if this thread is alive. A thread is alive if it has been started and has not yet died.

join

public final void join()
                throws InterruptedException

Waits for this thread to die.

Throws:

InterruptedException

run

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. Subclasses of Thread should override this method.

Specified by:

run in interface Runnable

setPriority

public final void setPriority(int newPriority)

Changes the priority of this thread.

sleep

public static void sleep(long millis)
                  throws InterruptedException

Causes the currently executing thread to sleep (temporarily cease execution) for the specified number of milliseconds. The thread does not lose ownership of any monitors.

Throws:

InterruptedException

start

public void start()

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).

toString

public String toString()

Returns a string representation of this thread, including the thread's name and priority.

Overrides:

toString in class Object

yield

public static void yield()

Causes the currently executing thread object to temporarily pause and allow other threads to execute.

getStackTrace

public StackTraceElement[] getStackTrace()