A simple example:
public class Test extends Thread {
public synchronized void run() {
for (int i = 0; i <= 10; i++) {
System.out.println("i::"+i);
}
}
public static void main(String[] args) {
Test obj = new Test();
Thread t1 = new Thread(obj);
Thread t2 = new Thread(obj);
Thread t3 = new Thread(obj);
t1.start();
t2.start();
t3.start();
}
}