Is there a method in Java where it can tell me the age of a running thread?

[watdahel]

Is there a method in Java where it can tell me the age of a running thread? I want to be able to print out the time a particular thread does something.

 

[Kilrsat]

I can't think of anything that exists, but it would be easy enough to subclass Thread, add a timestamp variable, add a getTimestamp() method, and simply have it fill in the time value at the start of the run() method or in the constructor.

 

[watdahel]

What about a method to tell me the age of a thread?

 

[RaynorWolfcastle]

run GetTimeStamp() at the beginning of the thread, then again when you want to know how long the Thread has been running, then subtract one from the other.

 

[watdahel]

What package is that in?

 

[notfred]

Originally posted by: erwin1978
What package is that in?

That package is in the "YouObviouslyCantRead" class.

 

[watdahel]

Is that a real class? I can't find it. Look it up for me Fred. You're a pal.

 

[watdahel]

Can someone write a sample code using getTimestamp(). Isn't that under the Event interface? I implement Event interface and I get compilation error.

code
file

 

[notfred]

Kilrsat invented the getTimestamp() method. He told you to write a subclass of Thread and add a getTimestamp() method.

 

[Kilrsat]

You missed a few key points in your ThreadTest class, and in the actual usage of the getTimeStamp() idea.

You wanted to know when a thread starts, so that's what this does.

To call it, you would use thread1.getTimeStamp() or thread2.getTimeStamp()

This now let's you know when each of the threads entered the run method.

class ThreadTest extends Thread
{
long timeStamp = 0;

public long getTimeStamp() {
return timeStamp;
}

public void run()
{
//loads the starting time of this thread into timeStamp
timeStamp = System.currentTimeMillis();
System.out.println( "time for " + getName() + " is " + System.currentTimeMillis() );

try{
System.out.println( getName() + ": is sleeping" );
sleep( (int) ( Math.random() * 5000));
}
catch ( InterruptedException e ) {
System.err.println( e.toString() );
}

System.out.println( "time for " + getName() + " is " + System.currentTimeMillis() );
}


public ThreadTest( String threadName )
{
super( threadName );
}
}

 

[watdahel]

I want a int variable that is shared by several threads. If one thread increments the variable all threads will see change. How do I accomplish this? In C++ it's a matter of passing pointers, but I don't know how in java.

 

[Kilrsat]

replace:

long timeStamp = 0;

with:

static long timeStamp;

You'll need a long, when dealing with currentTimeMillis().

 

[watdahel]

I have a class with a synchronized method and another that isn't. If a thread accessess the synchronized method it gets a lock? Can another thread come in and access the non-synchronized method at same time or is the entire class blocked?

 

[glugglug]

If you cut your network cable in half, do you get twice the bandwidth since there are 2 pieces?

Try this and get back to us.