public class leadConverthandler {
    public static void convertmethod(list<Lead>leadlist){
        try{
            List<Database.LeadConvert> leadConverts = new List<Database.LeadConvert>();
            for (Lead lead : leadlist) {
                if (lead.Status == 'Closed - Converted' && lead.IsConverted == false) {
                    Database.LeadConvert lc = new Database.LeadConvert();
                    lc.setLeadId(lead.Id);
                    LeadStatus convertStatus = [SELECT Id, MasterLabel FROM LeadStatus WHERE IsConverted=true LIMIT 1];
                    lc.setConvertedStatus(convertStatus.MasterLabel);
                    
                    
                    leadConverts.add(lc);
                }
            }
            if (!leadConverts.isEmpty()) {
                List<Database.LeadConvertResult> lcr = Database.convertLead(leadConverts);
            }
        }catch(Exception e){
            System.debug('Error'+e);
        }
        
    }
    
}