Client and backend. This class is shared: the same code is compiled into your app and into your server, so everything on this page works in both.

public class Thread

Object
Thread

ImplementsRunnable

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.

Nested types

interface Thread.UncaughtExceptionHandler Handles what a thread’s run method throws.

Fields

`public static final int MAX_PRIORITY = 10`	The maximum priority that a thread can have.
`public static final int MIN_PRIORITY = 1`	The minimum priority that a thread can have.
`public static final int NORM_PRIORITY = 5`	The default priority that is assigned to a thread.

Constructors

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

Methods

`public static int activeCount()`	Returns the current number of active threads in the virtual machine.
`public static` `Thread currentThread()`	Returns a reference to the currently executing Thread object.
`public final` `String getName()`	Returns this thread’s name.
`public final int getPriority()`	Returns this thread’s priority.
`public void interrupt()`	Interrupts this thread.
`public static boolean interrupted()`	Tests and clears the current thread’s interrupt status.
`public boolean isInterrupted()`	Tests this thread’s interrupt status without clearing it.
`public final void setDaemon(boolean on)`	Marks this thread as a daemon before it is started.
`public final boolean isDaemon()`	Returns whether this thread is a daemon.
`public final boolean isAlive()`	Tests if this thread is alive.
`public final void join() throwsInterruptedException`	Waits for this thread to die.
`public final synchronized void join(long millis) throwsInterruptedException`	Waits at most `millis` milliseconds for this thread to die; 0 waits for as long as it takes.
`public final synchronized void join(long millis, int nanos) throwsInterruptedException`	Waits at most `millis` milliseconds plus `nanos` nanoseconds for this thread to die.
`public static void sleep(long millis, int nanos) throwsInterruptedException`	Sleeps for `millis` milliseconds plus `nanos` nanoseconds.
`public final void setName(String name)`	Changes this thread’s name.
`public long getId()`	A number that identifies this thread for its lifetime.
`public void setUncaughtExceptionHandler(Thread.UncaughtExceptionHandler handler)`	Sets the handler for what this thread’s run method throws; null leaves it to the default handler.
`public` `Thread.UncaughtExceptionHandler getUncaughtExceptionHandler()`	This thread’s handler, or the default handler when it has none.
`public static void setDefaultUncaughtExceptionHandler(Thread.UncaughtExceptionHandler handler)`	Sets the handler for what any thread without its own handler throws.
`public static` `Thread.UncaughtExceptionHandler getDefaultUncaughtExceptionHandler()`	The handler `setDefaultUncaughtExceptionHandler` set, or null.
`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 final void setPriority(int newPriority)`	Changes the priority of this thread.
`public static void sleep(long millis) throwsInterruptedException`	Causes the currently executing thread to sleep (temporarily cease execution) for the specified number of milliseconds.
`public void start()`	Causes this thread to begin execution; the Java Virtual Machine calls the run method of this thread.
`public` `String toString()`	Returns a string representation of this thread, including the thread’s name and priority.
`public static void yield()`	Causes the currently executing thread object to temporarily pause and allow other threads to execute.
`public` `StackTraceElement[] getStackTrace()`

Inherited methods

From Object

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

Field details

MAX_PRIORITY

public static final int MAX_PRIORITY = 10

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

MIN_PRIORITY

public static final int MIN_PRIORITY = 1

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

NORM_PRIORITY

public static final int NORM_PRIORITY = 5

The default priority that is assigned to a thread. 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.

interrupted

public static boolean interrupted()

Tests and clears the current thread’s interrupt status. Compile-time declaration; each platform supplies the runtime implementation.

isInterrupted

public boolean isInterrupted()

Tests this thread’s interrupt status without clearing it.

setDaemon

public final void setDaemon(boolean on)

Marks this thread as a daemon before it is started.

isDaemon

public final boolean isDaemon()

Returns whether this thread is a daemon.

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

join

public final synchronized void join(long millis)
throws InterruptedException

Waits at most millis milliseconds for this thread to die; 0 waits for as long as it takes.

Throws

InterruptedException

join

public final synchronized void join(long millis, int nanos)
throws InterruptedException

Waits at most millis milliseconds plus nanos nanoseconds for this thread to die.

Throws

InterruptedException

sleep

public static void sleep(long millis, int nanos)
throws InterruptedException

Sleeps for millis milliseconds plus nanos nanoseconds.

Throws

InterruptedException

setName

public final void setName(String name)

Changes this thread’s name.

getId

public long getId()

A number that identifies this thread for its lifetime.

setUncaughtExceptionHandler

public void setUncaughtExceptionHandler(Thread.UncaughtExceptionHandler handler)

Sets the handler for what this thread’s run method throws; null leaves it to the default handler.

getUncaughtExceptionHandler

public Thread.UncaughtExceptionHandler getUncaughtExceptionHandler()

This thread’s handler, or the default handler when it has none.

setDefaultUncaughtExceptionHandler

public static void setDefaultUncaughtExceptionHandler(Thread.UncaughtExceptionHandler handler)

Sets the handler for what any thread without its own handler throws. In a Codename One application it also receives what an event dispatch thread task throws, which then no longer reaches the platform’s own error handling.

getDefaultUncaughtExceptionHandler

public static Thread.UncaughtExceptionHandler getDefaultUncaughtExceptionHandler()

The handler setDefaultUncaughtExceptionHandler set, or null.

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.

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.

yield

public static void yield()

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

getStackTrace

public StackTraceElement[] getStackTrace()