Java Reference
In-Depth Information
Class Definition
The following shows the form of a class definition that is most commonly used; however,
it is legal to intermix the method definitions and the instance variable declarations.
SYNTAX
public class
Class_Name
{
Instance_Variable_Declaration_1
Instance_Variable_Declaration_2
. . .
Instance_Variable_Declaration_Last
Method_Definition_1
Method_Definition_2
. . .
Method_Definition_Last
}
EXAMPLES
See Displays 4.1 and 4.2.
is equivalent to
System.out.println(date1.month + " " + date1.day
+ ", " + date1.year);
Similarly,
date2.writeOutput();
is equivalent to
System.out.println(date2.month + " " + date2.day
+ ", " + date2.year);
File Names and Locations
Remember that a file must be named the same as the class it contains with an added
.java
at the end. For example, a class named
MyClass
must be in a file named
MyClass.java.
We will eventually see other ways to arrange files, but at this point, your program and all the
classes it uses should be in the same directory (same folder).
