can i use another text editor instead of notepad++

Answer 1

No, it is forbidden.
Of course you can, what kind of question is this?

Answer 2

for Java there are several IDEs to code in: eclipse, NetBeans, intellij, bluej...
you can also use any text editor you like: notepad, notepad++, brackets, sublime...

Answer 3

No

Answer 4

You can use any text editor

Answer 5

Yes you can