Here is another simpler example for wait() notify().
code:
**********************************************
// Without using Synchronization, with priority.
class Stwait implements Runnable
{
String s1="null",s2;
int flag=2;
Stwait()
{
Thread t2=new Thread(this,"two");
t2.start();
t2.setPriority(8);
Thread t3=new Thread(this,"three");
t3.start();
t3.setPriority(6);
}
public void run()
{
synchronized(this)
{
for (int i=0;i<3;i++)
{
s2=Thread.currentThread().getName();
if(s2.equals("one"))
{if (flag==1)
{ flag=1;
System.out.println(s2 +" Waiting ");
s1=s2;
try{wait();}catch(Exception e){}
}
System.out.print("firtd");
System.out.print(" ");
flag=1;
System.out.println(s2 +" Notifying: "+s1);
notify();
try{wait();s1=s2;Thread.currentThread().sleep(800);} catch(Exception e){}
}
if(s2.equals("two"))
{ if(flag==2)
{ flag=2;
System.out.println(s2 +" Waiting ");
s1=s2;
try{wait();}catch(Exception e){}
}
System.out.print("sectd");
System.out.print(" ");
flag=2;
System.out.println(s2 +" Notifying: "+s1);
notify();
try{wait();s1=s2;Thread.currentThread().sleep(800);} catch(Exception e){}
}
if(s2.equals("three"))
{ if (flag==3)
{ flag=3;
System.out.println(s1 +" Waiting ");
s1=s2;
try{wait();}catch(Exception e){}
}
System.out.print("thrtd");
System.out.print(" ");
flag=3;
System.out.println(s2 +" Notifying: "+ s1);
notify();
try{wait();s1=s2;Thread.currentThread().sleep(800);} catch(Exception e){}
}
}
}
}
public static void main(String ars[])
{
Thread.currentThread().setPriority(10);
Thread t1=new Thread(new Stwait(),"one");
t1.start();
t1.setPriority(4);
System.out.print(" out of main");
}
}
*****************************************************
end of code:
enjoy middling with
java Netharam
[This message has been edited by netharam ram (edited November 21, 2001).]