how do i get the expected output(domain name,employee names) from below code using java

Hi Experts,

i want to display domain name and employee names.
below are the reocords getting from db .

domain      fullname

admin      	srini
admin		vasu
admin		rao
DB			pavan
DB			venkat
DB			simha
java		        sneha
java		        sharma
java		         karan

i want to display the output like below


admin    srini
		vasu
		rao
		
DB		pavan
		venkat
		simha
		
java	        sneha
		sharma
		karan


how do i get the expected output.
		
List<Object> domainDetails = dao.getStaffInfo()//getting the records from db
if(!domainDetails.isEmpty()){
Map<String,String> map = new HashMap<>();
for(Object object : domainDetails){
Object[] row = (Object[])object;
map.put((String)row[0],(String)row[1]);
}
return map;
}

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can some one suggest me
Thanks,