Exercise 2.1 in the book: Learn how to compile a Java program with the javac command and run the compiled program with the java.
Exercise 3.6 in the book. The topic of the exercise is Strings in Java.
Exercise 3.10 in the book. Covers the topics the switch statement and loop structure.
Design a program that can find the largest value in an array of integers.
If you have time left try to take a look at the other programs that are included with the J2SE version 1.4.0 SDK. Look in the /pack/jdk-1.4.0/bin direcotory.