threads question

[sandor]

I am trying to learn how to use threads to run a couple of methods repeatedly. This is my code and I get a compilation error when I try to run it. I am confused. help.

 public void doA() {
        System.out.println("now I am doing A");
    }
    public void doB() {
        System.out.println("now I am doing B");
    }
    public void sleep() {
        System.out.println( " Zzzzzzz...");
    }

    public void live() {
        new Thread() {
            public void run() {
                while (true) {
                    doA();
                    doB();
                    sleep();
                }
            }
        }.start();
    }

[derrickD]

Threads are hard. I think that the sleep method that this anonymous class is using is its sleep() method which needs a parameter passed in. I do not think it is using the sleep method you created. I changed your method name to doze() and changed it in the anonymous class and it ran , but of course it never stopped running. Somewhere you need to give it a time to stop, unless of course it is something you want to run forever, which, I supposed, you might

[pegitha]

You could also use the sleep(long) method instead of yours.

long interim=1000;
public void live() {
		
	new Thread()
	{
		public void run()
		{
		while (true)
		{
			doA();
			doB();
		try
		{
			sleep(interim);
		} catch (InterruptedException e)
		{
			e.printStackTrace();
		}
		}
		}
         }.start();
		
    }

[sandor]

Thanks to both of you.

[Maris]

can anyone help me?I have one question i.e what is the difference between start() and run.we can run a thread by thread.run() then why we need start().

[ingle.anil]

thread.start() -- concurrent execution
1)create new thread and
2)then calls run() method.

thread.run() -- sequential execution
1)calls run() method.
- no new Thread creation.

[rorootot]

One more question.
Why in front of start () is put dot, like that ''.start()''?
Does in threads is obligatory to do like that?

[Norm]

That is the syntax for calling an object's method: <object-ref>.<method>...

[lagnajita]

Hello All,

I am new to this community as well as Java.

I need to understand how threading works in Java and have to imolement the code for hungry birds problem and The Bear and the Honeybees problem in Java using semaphore.

help needed.

[CJSLMAN]

You should open a new post.... this post (the one you used) is very old (almost two years). As for your question about threads and semaphores, here's a couple of links:

Processes and Threads (The Java™ Tutorials > Essential Classes > Concurrency)

Semaphore (Java 2 Platform SE 5.0)

Programming Examples: Java Semaphore

Example Java classes

Luck,
CJSL