1 Sections 2.1 - 3 Java Virtual Machine and Byte Code Fundamentals of Java: AP Computer Science Essentials, 4th Edition Lambert / Osborne.

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Presentation transcript:

1 Sections Java Virtual Machine and Byte Code Fundamentals of Java: AP Computer Science Essentials, 4th Edition Lambert / Osborne

Chapter Why Java? Java is the fastest growing programming language in the world. – Sun, IBM use Java to develop applications. Java is a modern object-oriented programming language.

Chapter Why Java? (continued) Java is ideal for distributed, network-based applications. – Secure: Virus-free, tamper-free systems. – Robust: Supports development of programs that do not overwrite memory. – Portable: Yields programs that can be run on different computer types.

Chapter Why Java? (continued) Java supports advanced programming concepts. – Thread: A process that can run concurrently with other processes. Java resembles C++. – Easy for a C++ programmer to learn Java. Java does run more slowly than other languages because it is interpreted.

Chapter The Java Virtual Machine and Byte Code Java compilers translate Java into Java byte code. – Not machine language – Must install JVM (Java Virtual Machine). A JVM is an interpreter. – An interpreter is a program that runs like a computer. – An interpreter runs slower than a computer.

Chapter The Java Virtual Machine and Byte Code (continued) JVMs are getting faster. – Using JIT (just-in-time) compilations, which translate byte code into machine language. Any computer can run an interpreter. – Makes Java byte code portable. Java applets – Applets are small programs already translated into byte code that are built into Web sites. – Can be decorative or practical.

Chapter Choosing a User Interface Style Two user interfaces for a temperature conversion program Graphical user interface (GUI) Terminal I/O user interface

Chapter Choosing a User Interface Style (continued) Why use terminal I/O? – In Java, it’s easier to implement than GUI. – There are programming situations that require terminal I/O. – Terminal-oriented programs are similar in structure to programs that process files of sequentially organized data.

Chapter 1 9