Win a copy of The Journey To Enterprise Agility this week in the Agile and Other Processes forum! And see the welcome thread for 20% off.
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Jeanne Boyarsky
  • Liutauras Vilda
  • Campbell Ritchie
  • Tim Cooke
  • Bear Bibeault
Sheriffs:
  • Paul Clapham
  • Junilu Lacar
  • Knute Snortum
Saloon Keepers:
  • Ron McLeod
  • Ganesh Patekar
  • Tim Moores
  • Pete Letkeman
  • Stephan van Hulst
Bartenders:
  • Carey Brown
  • Tim Holloway
  • Joe Ess

Synchronized Thread doubt  RSS feed

 
Greenhorn
Posts: 29
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
package may25th;

class Synchr extends Thread {
synchronized void method1() throws InterruptedException {
for (int i = 0; i < 5; i++) {
System.out.println("method1-------" + i+ " "+Thread.currentThread().getName());
Thread.sleep(1000);
}
}

synchronized void method2() throws InterruptedException {
for (int i = 0; i < 5; i++) {
System.out.println("method2-------" + i+" "+Thread.currentThread().getName());
Thread.sleep(1000);
}
}

public void run() {
try {
method1();
} catch (InterruptedException e1) {
e1.printStackTrace();
}
try {
method2();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}

public class ThreadSynch2 {
public static void main(String[] args) {
Synchr s = new Synchr();
s.setName("one");
s.start();
Synchr s1 = new Synchr();
s1.setName("two");
s1.start();

}

}

The ooutput of the above program is
method1-------0 one
method1-------0 two
method1-------1 one
method1-------1 two
method1-------2 one
method1-------2 two
method1-------3 one
method1-------3 two
method1-------4 one
method1-------4 two
method2-------0 one
method2-------0 two
method2-------1 one
method2-------1 two
method2-------2 one
method2-------2 two
method2-------3 one
method2-------3 two
method2-------4 one
method2-------4 two

I could not understand why thread 2 is called before one completes even though the method is synchronized.
Sorry if there was any mistake in this
Please clarify me
 
Greenhorn
Posts: 17
  • Likes 1
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
In order to synchronize 2 threads, the synchronized object must be the same. In your code, each thread is synchronizing on its own Thread object, which is meaningless.
 
Anudeep Duvvuri
Greenhorn
Posts: 29
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
ya i got it after posting here thank you for your reply
 
With a little knowledge, a cast iron skillet is non-stick and lasts a lifetime.
  • Post Reply Bookmark Topic Watch Topic
  • New Topic
Boost this thread!