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Static and Instance Methods, Variables, and Initialization Code

Static methods, variables, and initialization code have these characteristics

  • They’re associated with a class.
  • They’re allowed only in outer classes.
  • They’re initialized only when a class is loaded.
  • They aren’t transmitted as part of the view state for a Visualforce page.

Using Static Methods and Variables

public class Parent { 
   public static boolean isRun = true; 
}

A trigger that uses this class could then selectively fail the first run of the trigger

trigger T1 on Account (before delete, after delete, after undelete) { 
       if(Trigger.isBefore){
          if(Trigger.isDelete){
             if(Parent.isRun){
                 Trigger.old[0].addError('Before Account Delete Error');
                  Parent.isRun=false;
             } 
         }
    }
}

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