Java is a very powerful language it is used almost everywhere. You cannot learn java in just 7-10 days but you can learn java for android in 7-10 days.

How many days it will take to learn Java?

On average, becoming a confident Java programmer takes about 1–2 years, considering you spend 2–3 hours per day practicing coding. Familiarising yourself with the language to the point where you can edit someone else’s code or write basic apps can take as little as four months.

Can I learn Java in 2 months?

Realistically, in two months you may be able to learn variables, basic operators, methods, arrays, inheritance, and maybe some basic java swing stuff. You’re not going to get an entry level Java dev job with any of this, especially within two months.