Introduction to Class Variables & Methods and Objects

Introduction to Class Variables & Methods and Objects 

Class variables: 

The variables in the class should specify the following properties when they are defined. 

1.Optional: modifiers such as public or final as well as static. 
2.Required: the data type of the variable, such as string or Boolean. 
3.Optional: the value of the variable 
4.Optional: the name of the variable    

Syntax: 

              [public |private| protected |global| final] [static]
                             Data - type variable – name 
Ex: 
           Private static final integer My-INT; 
           Private finale integer I = 1;

Class methods:

To define a method, specify the following. 
1.optional:  modifiers, such as public or protected.
2.Required:  the data type of the value returned by the method, such as string or integer. Use void if the method does not return value. 
3Required:  A list of input parameters for the method, separated by common, each preceded by its data type, and enclosed in parentheses (). If

There are no parameters, use a set of empty parentheses. 
A method can only have 32 input parameters. 

4.Required:  the body of the method, enclosed in braces {}.
All the code for the method, including any local variable declarations, is contained here.

Syntax: 
        (public |private | protected | global) [over ride] [static]   
            Data-type method- name (input parameters)
         {
         // the body of the method.
          }
Ex1: 
          Public static Integer get Int ()
 {
    return – MY INT ; 
      }
Ex2: 
        Public class example 
        {
          Public Integer Show (Integer age)
         {
           System debug (‘My age is’ tag);
             }
         }

Object:

Object is an instance of the class. This as both state and behavior.
memory for the data members our allocated only when you create an object   

Syntax: 
             Class name object name = New class name ();
                   ↓                   ↓                                            ↓
              Object        variable name                        constructor 

Ex:    
         Class example 
          {
             //code 
            }

          Example e = new example ();