I'm vary new to java programming and confused about som concepts.

[sagar474]

To create threading there is an object

Thread.sleep();

Is Thread is an object ? sleep is a method? I never created a object called Thread then how can it exists.

[Norm]

Thread is a class and sleep is a static method in that class.
Have you read the API doc for the Thread class?
The API doc is here: Java Platform SE 6
Find the Thread class in the lower left and click on it to bring the doc into the righthand frame.
Read in the tutorials about static methods and variables.

[Sean4u]

java.lang.Thread is a class. The Java compiler automatically resolves references to java.lang.* classes as though you had included the line "import java.lang.*;" in your source.

Thread (Java 2 Platform SE 5.0)

sleep(int) is declared static, so you can access the method from the class without needing an instance of Thread.

The Thread API is a bit of a mess. I wish the Sun developers had made sleep a member method so that to sleep your current thread, you'd have to use "Thread.currentThread().sleep(1000);" - which is probably what the current method does internally. Note that you can do this anyway, but the reference from currentThread() would be redundant.

edit: 1 minute later than Norm as usual. I'm going to have to start my own Java programming forum

[sagar474]

Yea since sleep is a static method?

[Norm]

Are you asking a question?

[sagar474]

yes because I'm very new to java.

[Norm]

What is the question?

[sagar474]

you answered in #2 that what I understood is sleep is a static method hence it invoked with out actually creating an object reference variable. right?

[Norm]

right?

Sorry, I don't understand your question. Do you understand the previous posts?

[sagar474]

I'm asking what I have understand is right or wrong?

[Norm]

I understood is sleep is a static method hence it invoked with out actually creating an object reference variable

yes that sounds right.

[Mr.777]

If you are beginner, you must not start with threads but with classes first.

[macko]

sleep example:

...
thread.sleep(2000);
textarea.append("this Message displays after 2 seconds!");
thread.sleep(5000);
textarea.append("This Message displays after 5 seconds!");
thread.sleep(1000);
System.out.println("This Message will display on the console after 1 second!");
...

Although i wouldn't recommend using sleep when appending to a JTextArea, Due to it causing your program to freeze for the ammount of sleep time. Instead you would use a "timer".

Timer example on oracle: http://download.oracle.com/javase/tu...isc/timer.html

[Norm]

@macko
What happens when you execute the code you posted?
Does it do what you want it to do? What do you want the code to do?

[Mr.777]

@macko
What happens when you execute the code you posted?
Does it do what you want it to do? What do you want the code to do?

I guess he just tried to present the sleep() concept, as it puts your thread to sleep condition for number of milliseconds/nanoseconds.

[macko]

@Mr.777
correct....

Just a demonstration of a spot never to use a sleep