Question 1. What class must be implemented for a program to use threads?

1.a. Runnable

1.b. Thread

1.c. Applet

Runnable must be used with the implements statement. Thread is used inside a multithreaded program, but it is not needed in the class statement that begins a program..

Question 2. If an interface contains three different methods, how many of them must be included in a class that implements the interface?

2.a. None of them

2.b. All of them

2.c. I know, but I'm not telling

An interface is a guarantee that the class includes all the interface's methods.

Question 3. You're admiring the work of another programmer who has created a program that handles four simultaneous tasks. What should you tell him?

3.a. "That's not half as exciting as the Anna Kournikova screensaver I downloaded off the Web

3.b. "You're the wind beneath my wings

3.c. "Nice threads!"

This compliment could be confusing if the programmer is well-dressed, but let's be honest, what are the chances of that?