Thread: Synchronized Methods problem!

Hi,

I have an assignment that needs to use synchronized methods, what I have to do is create a supermarket app in Java where I set a favourite item/product's ID and retrieve it however those two methods need to use synchronized methods. Also I am using a GUI, so how do I implement that into two buttons?

e.g. Set Favourte, Retrieve Favourite?

   private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {                                         
 
    }                                        
 
    private void jButton6ActionPerformed(java.awt.event.ActionEvent evt) {                                         
 
    }   
 
 synchronized public void retrieveFav()throws InterruptedException {
 
    }
 
    synchronized public void setFav()throws InterruptedException {
 
    }