assignment 15

user

login

chat with contacts

user

chat privately

chat in a group

select group/contact

receive msg send msg

record in chat history

Contact

- name: String - p_numb: String

+ setName(String name): void +getName(): String +setNumber(String p_number): void +getNumber(): String

+Contact(String name, String phone)

+toS tring(): String

+sendMessage(Contact ct, Message ms g): void

+receiveMes sage(Contact ct): Message

<<abstract>> Message

# ti me_seq: int # sender: Contact

+getTime(): int

+getS ender(): Contact

+<<abs tract>> sendMsg(Contact ct, Message ms g): void

+<<abs tract>> receiveMsg(Contact ct):Message

+<<abs tract>>toS tring(): String

TextMsg

- text: String

VoiceMsg

-msg: Audio

Audio

- audio: String

+setAudio(String audio): void + getAudio(): String

+ Audio(String msg)

+ toS tring() : String

contains

1

1

0

* send

+ TextMsg(Contact ct, int time, String text)

+TextMsg(Contact ct)

+VoiceMs g(Contact ct, int time, Audio audioMsg)