I am developing an application, in this application, i need to mail and message concept. when we click an mail button then
message send to member's email id. And also when we click message button then message send to member's phone.
How i do this? what are the concept i need to study? please help me.
For mail, look at Java Mail API.
For message/SMS, There's no standard API, just find some SMS geteway service providers/ Bulk messaging service providers, they have their own API