Answers to Self Tests - Java: A Beginner's Guide - page 817

Appendix A
Answers to Self Tests
Chapter 1: Java Fundamentals
1 . What is bytecode and why is it important to Java's use for Internet programming?
Bytecode is a highly optimized set of instructions that is executed by the Java Virtual
Machine. Bytecode helps Java achieve both portability and security.
2 . What are the three main principles of object-oriented programming?
Encapsulation, polymorphism, and inheritance.
3 . Where do Java programs begin execution?
Java programs begin execution at main( ) .
4 . What is a variable?
A variable is a named memory location. The contents of a variable can be changed
during the execution of a program.