Java Syntax, Java Conventions, CSE 115 Conventions (Part 1)

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Java Syntax, Java Conventions, CSE 115
Conventions (Part 1)

• CSE 115
• Spring 2006
• January 25 27, 2006

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I - Java Files

• All files that contain Java source code have a
  .java extension
• Code that has been compiled (using the compiler
  javac) will be turned into byte code and stored
  in files with a .class extension
• Run the files with the java command to execute
  the program.

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I Java Files

• The process of creating files is often called the
  edit-compile-run cycle as the steps are
• Create/edit your source code
• Compile the code
• Run the program to see if it works
• If it doesnt work correctly, go back to step 1

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II Java Syntax

• Java is case sensitive (as is UNIX)
• The words
• excellent
• Excellent
• are seen as different by Java
• Java is also an extremely consistent speller.

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III Names of Java Files

• Match the names of the classes defined in those
  files
• Each file contains one (and only one) class
  definition
• All Java code must exist inside of a class

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IV Identifying the class

• Class definitions begin at the word public and
  end at a that matches a that follows the name
  of the class.
• public class SomeName
• Between the is the Java code that outlines
  what the functionality of the class is.

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V Class vs. Object

• Class formal specification (definition)
• Object actual instance
• We need to represent properties and capabilities
  formally, what programming constructs do we use
  to do this?

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VI Where does the program start?

• Q How do you get your program to run in Eclipse?
• Q What are the two types of Java programs and
  what are their differences?
• Program starts with the first line of the
  Applets constructor.