java is a programming language, and what projects you do depends on the person who uses the language.
It's like a knife, you can use it to cut meat, or vegetables, or fruits, or if the situation calls for it you can use it to chop wood.
To give some examples, java can do e-government projects, you can do banking projects, you can also do automated office projects, you can also do food and beverage projects and so on and so forth.
If it helps you, please click to adopt.