why one thread runs

[kashif sohail]

public class ethread extends Thread
{ int x;
int y;
public static void main(String []args)
{
ethread et=new ethread();
Thread a=new Thread(et);
Thread b=new Thread(et);
a.start();
b.start();
}
public void run (){
for (int i=0;i<10;i++)
{//line 1
x++;
y++;
System.out.println("x"+x+"y"+y+"CurrentThread"+getName());
}
}
}
the reuslt is like blew what i m not sure is where is the second thread
2:
what if i wish to synchronize it like
synchronize(this){ //after line 1
but it gives me error
any help

x1y1CurrentThreadThread-0
x2y2CurrentThreadThread-0
x3y3CurrentThreadThread-0
x4y4CurrentThreadThread-0
x5y5CurrentThreadThread-0
x6y6CurrentThreadThread-0
x7y7CurrentThreadThread-0
x8y8CurrentThreadThread-0
x9y9CurrentThreadThread-0
x10y10CurrentThreadThread-0

[Val Dra]

i changed your code a little so infact thread 2 and i both do run look at this
public class ethread extends Thread
{ int x;
int y;
public static void main(String []args)
{
ethread et=new ethread();
Thread a=new Thread(et);
Thread b=new Thread(et);
a.start();
b.start();
}
public void run (){
while(true)
{//line 1
x++;
y++;
System.out.println("x"+x+"y"+y+"CurrentThread"+Thread.currentThread().getName());
}
}
}

[kashif sohail]

actually my question is why 2nd thread did not runs (as it shows)
and would u plz explain the use of while
thanx
kashif

[Val Dra]

i tell you 2nd threads runs as well , if you look at it , try to run the example that i modified 2nd threads does run infact. The reason why i switched to while is to see longer which threads can run becouse in your loop the thread might not be run because we don't know when it can run. So i changed it , to while ,Almost always you will have a while loop or endless for loop

[Aftab Ahmed]

Hi Sohail,
i just little change your code
public class ethread extends Thread
{ int x;
int y;
public static void main(String []args)
{
ethread et=new ethread();
Thread a=new Thread(et);
Thread b=new Thread(et);
a.start();
b.start();
}
public void run (){
for (int i=0;i<10;i++)
{//line 1
x++;
y++;
System.out.println("x"+x+"y"+y+"CurrentThread"+currentThread().getName()); //here is changes just add currentThread() method
}
}
}
hope that help
Aftab

[kashif sohail]

tnax all but what about my second question
how to sync the method without usin sysncronized key word in mehtod definition (actulyy sync the some block of method)
2:
what if i wish to synchronize it like
synchronize(this){ //after line 1
but it gives me error
any help