Self Check

18. Which of the following are packages?
    1. java
    2. java.lang
    3. java.util
    4. java.lang.Math
19. Can you write a Java program without ever using import statements?
20. Suppose your homework assignments are located in the directory /home/me/cs101 (c:\me\cs101 on Windows). Your instructor tells you to place your homework into packages. In which directory do you place the class hw1.problem1.TicTacToeTester?