The document discusses creating Java applications and applets using TextPad as an IDE. It covers using TextPad features like the coding window and color coding. It also discusses important aspects of coding Java programs like using comments for documentation, specifying the public class header that matches the file name, and defining the main method header which is required for standalone applications. The class body is enclosed in curly braces and method headers specify modifiers, return types, names, and parameters.

1. Chapter 2: Creating a Java Application and Applet 1
Using TextPad
• TextPad has several window areas
– Coding window
– Selector window
– Clip Library window
• TextPad can display line numbers
– Helpful for finding compiler errors
• TextPad has color-coding capabilities
– Save a document before entering code to
enable Java related color-coding

2. Chapter 2: Creating a Java Application and Applet 2
Coding the Program -
Comments as Documentation
• Purpose of comments
– Provides clear description when reviewing code
– Helps programmer think clearly when coding
• Placement of comments
– Use a comment header to identify a file and its
purpose
– Place a comment at the beginning of code for each
event and method
– Place comments near portions of code that need
clarification

3. Chapter 2: Creating a Java Application and Applet 3
Coding the Program -
The Class Header
• Identify how the code can be accessed with an
access modifier
– public indicates that the code can be accessed by all
objects in the program and can be extended for a
subclass
• Specify a unique name for the class
– The class name at the beginning of the program must
match the file name exactly
– Java is case-sensitive
– By convention, uppercase letters are used for class
names and to distinguish words in class names

4. Chapter 2: Creating a Java Application and Applet 4
Coding the Program -
The Class Header
• Use braces {} after the class header to enclose
the class body

5. Chapter 2: Creating a Java Application and Applet 5
Coding the Program -
The Method Header
• The method header contains modifiers, return value,
method name, and parameters along with their data type
• Every stand-alone Java application must contain a
main() method, which is the starting point during
execution

6. Chapter 2: Creating a Java Application and Applet 6
Coding the Program -
The Method Header
• Modifiers set properties for a method
– public allows other programs to invoke this method
– static means this method is unique and can be
invoked with creating an instance
• Parameters are pieces of data received by the
method to help the method perform its operation
– Identifiers are used to name the variable sent to the
method
• Return type is the data type of the data returned
by the method
– If no data is returned, the keyword void is used