You can use java technically but it's easier if use JavaScript (nodejs) or python to host your bot in Ethiopia

Its better if you check API documentation of telegram ... https://core.telegram.org/

You can build with java too but there are many options there other Tha jave yehe bot be JavaScript new yeteserawe

Nah if you wanna create your own bot just use other bot creators. It doesn't require any knowledge of java or other If u wanna know the bot ask me

You should check the api documentation ena me personally prefers pytho.....python is great😍