Java Workshop 2'0

1
Java Workshop 2.0

• Introduction to the JWS 2.0 Programming
  Environment

2
Background

• Made by Sun, the developer of the Java language
• Built-in JDK 1.
• "Authentic" version of the language
• Provides access to most of the functionality of
  Java

3
Important Reminder

• Outside JWS, read and edit your java programs
  with WordPad and not Notepad

4
Setting the classpath

• When you import a class or a package, you have to
  tell JWS where to find it
• Example, if in your program you have
• import java.lancs.
• Let's say you have the directory structure
• D\javafiles\java\lancs\BasicIo.class where
• lancs directors contains all Garside's
  bytecode classes
• Then you need to set your classpath to
• D\javafiles

5
Setting the classpath (continued)

• You specify the classpath in JWS at
• PjtManager Project Edit Build
• then enter classpath, i.e., D\javafiles
• The classpath is concatenated with the package
  location in the import to tell JWS to find
  BasicIo.class in the location
• D\javafiles\java\lancs\BasicIo.class

6
Setting the classpath (continued)

• Due to a bug in JWS, do not put the package
  java.lancs in the root directory
• That is, do this
• D\javafiles\java\lancs\BasicIo.class
• and do not do this
• D\java\lancs\BasicIo.class
• If you do not have the classpath and import
  statements correct, you will get a build error
  message
• package java.lancs. not found in import