|
The CODE: |
Information
about the code: |
/*************************************
*Project: LabOneA
*Programmer: John Smith
*Date: September 23
*Program Name: Hello.java
**************************************/ |
All programs should begin with a
comment identifying
the purpose of the program and the programmer.
/**documentation */ - documentation commenting.
/* text*/ - is the format for block commenting.
// text - is the format for single line commenting.
Comment statements are ignored by the compiler. It is a
message to the reader of the code. |
| import java.io.*; |
The import command tells the computer to find
packages that
will be needed in the execution of the program. The
java.lang package is the only package imported automatically without
an explicit command; all other packages need an import command. This
package is used for input and output. (Packages are
collections of classes (libraries) which contain portable Java
bytecode files.) |
public class Hello
|
Every Java program is a class.
The program starts with the
name of the class. This name must be the same name as the .
java file in your folder. In this case the
file is saved as Hello.java.
Class names must begin with
a letter, an underscore or a dollar sign.
Class names may contain only letters, digits, underscores
and/or dollar signs.
Class names may not use reserved words. |
| { |
A set of
French curly braces { } is needed for every class. |
| public static void
main (String[ ] args) |
A
main
method is needed for execution to have a place to start. This
main method gets executed first. The idea of static will be
discussed later. The array of strings parameter is a
necessity. |
| { |
A set of
French curly braces { } is needed for main. |
System.out.println("This is a literal print.");
System.out.print("Yea!");
System.out.println("Go Java!"); |
Output statements: the
basic output statement in Java is the System.out.println( )
statement.
The
System.out.println( ) line will print what is between the
double quotes" " (called a literal print) and move the printing
cursor to the next line.
The
System.out.print( ) line will print what is between the double
quotes and leave the printing cursor on the same line. |
}
} |
Braces are closed to end the program. |
