trigger CountContactsnew on Contact (after insert, after delete, after undelete) {

    List<id> accIdList = new List<id>();
    if(Trigger.isInsert || Trigger.isUndelete){
        For(Contact con1 : Trigger.new){
            accIdList.add(con1.accountid);
        }
    }
    if(Trigger.isDelete){
        For(Contact con1 : Trigger.old){
            accIdList.add(con1.accountid);
        }
    }
    List<Account> accUpdateList = new List<Account>();
    For(Account acc : [SELECT Contact_Recs__c,(SELECT id FROM Contacts) FROM Account WHERE id =: accIdList]){
        acc.Contact_Recs__c = acc.Contacts.size();
        accUpdateList.add(acc);
    }
    try{
        update accUpdateList;
    }Catch(Exception e){
        System.debug('Exception :'+e.getMessage());
    }
}

public class OpportunityCustomRollup {

    public static void CountRollup(List<Opportunity> lstOpportunity){

        set<id> oppIds = new set<id>();
        map<string, integer> classroomIDToDeskCountMap = new map<string, integer>();
        id objrecordtypeid = [SELECT Id FROM RecordType WHERE DeveloperName ='Fund_Raising'].Id;
        double amount = 0;

        try {
                for (Opportunity objOpportunity : lstOpportunity){
                    oppIds.add(objOpportunity.Fund__c);
                }

                Fund__c objfund = [SELECT Id, Total_opportunity_amount__c  FROM Fund__c WHERE Id = :oppIds];
                List<Opportunity> list_Opportunity = [SELECT Id, Amount FROM Opportunity WHERE Fund__c = :objfund.Id and StageName = 'Closed Won' and RecordTypeId =: objrecordtypeid];


                 for(Opportunity AmountOpportunity : list_Opportunity) {
                        amount += AmountOpportunity.amount;
                 }


                  objfund.Total_opportunity_amount__c = amount;
                  update objfund;
            }


        catch (Exception e) {
                System.debug(e);
            }

    }

}

trigger newLeadTrigger on Opportunity (after insert , after update, after delete , after undelete) {

    if(trigger.isAfter && (trigger.isInsert || trigger.isUpdate || trigger.isUndelete)){
        OpportunityCustomRollup.CountRollup(Trigger.new);
    }

    if(Trigger.isDelete)
    {
        OpportunityCustomRollup.CountRollup(Trigger.old);
    }
}