Hi all ,
My requirment is to create sort order for tasks .........
the tasks are created when opportyunity record is created ........
Example : 3)Task3  but i want output has 1)Task1, 2)Task2, 3)Task3  in order
                 2)Task2
                 1)task1
My code :
public class CompsureTasks_helper{
    //Create tasks
    public static void createTasks(List<id> oppId){
    List<Opportunity> oppList = [select id,name,closedate,ownerid,Opportunity_Period__c from Opportunity where id IN : oppId];
    List<Task> insertTasks = new List<Task>();
    for(Opportunity opp : oppList){
    //for Task1
        task t = new task(OwnerId = opp.ownerid,Subject = 'Task1',Status = 'Open',Priority = 'Normal',WhatId = opp.Id);
           integer tt = (integer)Math.round((15*opp.Opportunity_Period__c)/100);
           system.debug('$$$'+tt);
           t.activitydate = system.today().adddays((integer)Math.round((15*opp.Opportunity_Period__c)/100));
           t.IsReminderSet = true;
           t.ReminderDateTime = t.activitydate;  
        insertTasks.add(t);
    //For Task2   
        task t1 = new task(OwnerId = opp.ownerid,Subject = 'Task2',Status = 'Open',Priority = 'Normal',WhatId = opp.Id);
            t1.activitydate = system.today().adddays((integer)Math.round((20*opp.Opportunity_Period__c)/100));
            t1.IsReminderSet = true;
            t1.ReminderDateTime = t1.activitydate;  
        insertTasks.add(t1);
      
    //For Task3   
        task t2 = new task(OwnerId = opp.ownerid,Subject = 'Task3',Status = 'Open',Priority = 'Normal',WhatId = opp.Id);
            t2.activitydate = system.today().adddays((integer)Math.round((25*opp.Opportunity_Period__c)/100));
            t2.IsReminderSet = true;
            t2.ReminderDateTime = t2.activitydate;  
        insertTasks.add(t2);
        
   
    }
    insert insertTasks;
    }
    }