Java tutorial
public class OnlyOneInMethod extends Object { private String objID; public OnlyOneInMethod(String objID) { this.objID = objID; } public synchronized void doStuff(int val) { print("entering doStuff()"); int num = val * 2 + objID.length(); print("local variable num=" + num); try { Thread.sleep(2000); } catch (InterruptedException x) { } print("leaving doStuff()"); } public void print(String msg) { threadPrint("objID=" + objID + " - " + msg); } public static void threadPrint(String msg) { String threadName = Thread.currentThread().getName(); System.out.println(threadName + ": " + msg); } public static void main(String[] args) { final OnlyOneInMethod ooim = new OnlyOneInMethod("obj1"); Runnable runA = new Runnable() { public void run() { ooim.doStuff(3); } }; Thread threadA = new Thread(runA, "threadA"); threadA.start(); try { Thread.sleep(200); } catch (InterruptedException x) { } Runnable runB = new Runnable() { public void run() { ooim.doStuff(7); } }; Thread threadB = new Thread(runB, "threadB"); threadB.start(); } }