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Writing Methods
Create the method
•
A Method is a tool to do something
•
It contains 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 two lines of code
• It tells the computer to print to the screen the text
that is inside the set of double quotes after skipping
a blank line
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
• The class is like a tool bag
• It can hold one or many tools (methods)
• The class also has a Header and a Body
Create a Class
The first part is called the Header
modifier
structure
name
public class MyMethods
{
open & closing braces
}
Create a Class
The second part is called the Body
The body contains one or more methods
public class MyMethods
{
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 (use) 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 RunMyMethods
{
public static void main(String [] args)
{
MyMethods mm = new MyMethods();
mm.message(); //class object calls method
}
}
Compile and Run
• Compile … correct any syntax errors
• Run … check for correct output
– If necessary make any corrections
– Then recompile and rerun.