Writing Methods

Create the method Methods, like functions, do something They contain the code that performs the job Methods have two parts

Create the method The first part is called the Header modifier return name public void message( ) { open & closing braces }

Methods have two parts The second part is called the Body The body contains the lines of code that instruct the computer what to do You can have as many lines of code in the body as you want

Methods have two parts This Body has one line of code It tells the computer to print to the screen the text that is inside the set of double quotes public void message( ) { System.out.println(); System.out.println(“java is not kawfy”); }

Create a Class To use the method we need to create a simple class We put the method inside the class The class can have as many methods as you wish The class also has a Header and a Body

Create a Class The first part is called the Header modifier structure name public class MyClass { open & closing braces }

Create a Class The second part is called the Body The body contains one or more methods public class MyClass { public void message() { System.out.println(); System.out.println(“java is not kawfy”); }

Create an Application An Application is an executable program It uses the methods of different classes to execute the program Some methods are from the Java Class Library Other methods are from the Classes that We wrote

Create an Application We will create an object (instance) of the class We will call (invoke) a method of the class The Application class also has a Header and a Body The Application has one method named main

Create an Application Syntax: public class Morty { public static void main(String [] args) { MyClass mc = new MyClass(); mc.message(); }

Compile and Run Compile … correct any syntax errors Run … check for correct output –If necessary make any corrections –Then recompile and rerun.

1-compile 2-run 3-output

You will need to download a text editor You will need to download the latest version of Java You will need to reset the Path variable You will then be ready to roll

To Edit (add or delete) the PATH of the Windows O/S 0- Start 1- Settings 2- Control Panel 3- System 4- System Properties (dialog box) 5- Advanced (tab) 6- Environment Variables… 7- User (System variables) You can edit a current variable You can add/delete Delimiter is a semi-colon

The Path should be edited by inserting the following line at the very beginning: C:\ program files\java\jdk1.5.0_06\bin; Make sure you put the semi-colon (delimiter) right after the word “bin”