sleep()

[Matthew B]

Will calling sleep on a thread release the threads lock an an obect/class?

[Anthony Villanueva]

No. See the sample code below:

 
public class Test
{
public static void main (String[] args)
{
Runner r = new Runner(5);
Thread t1 = new Thread(r, "Thread A");
Thread t2 = new Thread(r, "Thread B");
Thread t3 = new Thread(r, "Thread c");
t1.start();
t2.start();
t3.start();
}
}
class Runner implements Runnable
{
private int counter;
private final int MAX_LIMIT;
Runner(int limit)
{
MAX_LIMIT = limit;
}
public void run()
{

synchronized(this)
{
try
{
for (int i=0; i<MAX_LIMIT; i++)
{
System.out.println(Thread.currentThread().getName() + ": " + counter++);
Thread.sleep(1000);
}
}
catch(InterruptedException e)
{
e.printStackTrace();
}
}
}
}

[Mr. C Lamont Gilbert]

This comes directly from the SDK. Try to read the docs, they contain the information you seek.
sleep
public static void sleep(long millis)
throws InterruptedExceptionCauses the currently executing thread to sleep (temporarily cease execution) for the specified number of milliseconds. The thread does not lose ownership of any monitors.
Parameters:
millis - the length of time to sleep in milliseconds.
Throws:
InterruptedException - if another thread has interrupted the current thread. The interrupted status of the current thread is cleared when this exception is thrown.
See Also:
Object.notify()