Implementing method and add 'synchronized' keyword

Question

Basically, I have the following scenario:
public interface ClassA {
  public void doSomething(String s);
} Then, the class that implements ClassA:
public class ClassB implements ClassA {
  public ClassB() {
    doSomething("Testing");
  public synchronized void doSomething(String s) {
    // Do something...
  public static void main(String[] args) {
    ClassB cb = new ClassB();
}ClassB implements the doSomething(String s) method but adds the 'synchronized' keyword. I compile this and get no errors, but I wanted to make sure that adding the 'synchronized' keyword to a method that is implemented is a legit thing to do.
The reason I am asking is that Rational Rose does not generate code for this situation correctly, and before I call tech support, I wanted to make sure that it is not a problem with what I am doing. When Rose generates the code, it gives a warning that the method doSomething was not implemented and it adds the method. I then have two methods called 'doSomething'.
Thanks

Answer 1

'synchronized' is not part of the method signature. But if you want to work around the problem, instead of declaring the method as synchronized, simply do this instead, which is equivalent (for non-static methods):
public void doSomething(String s) {
  synchronized (this) {
    // your code here