How can understand this example of threads?

[solvable]

Consider we have something like this:

public class Test {
 
    public static void main(String[] args) throws InterruptedException {
 
        Example b = new Example();
        b.start();
    }
}
 
 
class Example extends Thread {
    int total,count;
 
    @Override
    public void run(){
            for(int i =0;i<5;i++){
                total+=i;
                System.out.println(i+" "+total);
            }
 
    } 
}

The result is:

0 0
1 1
2 3
3 6
4 10

How to understand these results? Iteration is only 4, but class field 'total' is 10. How?

[GregBrannon]

That for loop would do the same thing by itself in a main() method. The first value printed out is the for loop control variable, i, the second variable is the sum of all for loop control variable values for that pass through the loop, ending with 0 + 1 + 2 + 3 + 4 = 10 on the 5th pass.

Hope that helps.

[solvable]

Oh, I see. I thought that was about threads...but it seems it is simple loop...and I thought that it is more complex and related with threads behaviour

[manik90]

Hi,

Thread is very simple concept.

You can learn thread form here ...
and difference between two threads is here

and difference between two thread is ...

[GregBrannon]

@manik90: A thread with no activity for a week - certainly two - is dead. I don't believe solvable has been back since then, but that could be checked. Please check the date of the last post in a thread, and don't resurrect dead threads.

Closing this one, sending it back to the grave.

Oh, and Welcome to the Forum! Please read this topic to learn how to post code correctly and other useful tips for newcomers.