The object program contains the definition of data and methods for all instances of the class. 
                  
 
            
            
               General Format
 
               	  
               	  
 
               
              
            
            
               General Rules
 
               	  
                
                  	 
                  - If a data-item is declared in the Object-Storage Section of an object program, it is instance data. Instance data may be referenced
                     only in instance methods. 
                     	 
                  
- Data items are in their initial state at the start of the run unit and remain in their last used state between method invocations.
                     
                     	 
                  
- Method-1 is an instance method.