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Introduction to Java.ppt
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Introduction to Java
Introduction
• Present the syntax of Java
• Introduce the Java API
• Demonstrate how to build
– stand-alone Java programs
– Java applets, which run within browsers e.g.
Netscape
• Example programs
Why Java?
• It’s the current “hot” language
• It’s almost entirely object-oriented
• It has a vast library of predefined objects
and operations
• It’s more platform independent
– this makes it great for Web programming
• It’s more secure
• It isn’t C++
Applets, Servlets and
Applications
• An applet is designed to be embedded in a
Web page, and run by a browser
• Applets run in a sandbox with numerous
restrictions; for example, they can’t read
files and then use the network
• A servlet is designed to be run by a web
server
• An application is a conventional program
Building Standalone JAVA
Programs (on UNIX)
• Prepare the file foo.java using an editor
• Invoke the compiler: javac foo.java
• This creates foo.class
• Run the java interpreter: java foo
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