Java Syntax, Java Conventions, CSE 115 Conventions (Part 1) CSE 115 Spring 2006 January 25 & 27, 2006

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.

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 doesn’t work correctly, go back to step 1

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.

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

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. }

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?

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 Applet’s constructor.