1. When creating a runnable object, why might you want to extend Thread rather than implement Runnable? 2. Show how to use join( ) to wait for a thread object called MyThrd to end. 3. Show how to set...

1. When creating a runnable object, why might you want to extend Thread rather than implement Runnable? 2. Show how to use join( ) to wait for a thread object called MyThrd to end. 3. Show how to set a thread called MyThrd to three levels above normal priority. 4. What is the effect of adding the synchronized keyword to a method?