フリー問題

問題文

How can a single Java source file be launched without declaring a class around the entry method?

選択肢

1. The compiler automatically supplies the surrounding type when it is unqualified, and the entry method may then omit its formal parameters in that file.
2. The compiler automatically supplies the surrounding type when it is unqualified, and the entry method may then omit its final modifiers in that file.
3. The compiler automatically supplies the surrounding type when it is omitted, and the entry method may then omit its formal parameters in that file.
4. The compiler automatically supplies the surrounding type when it is omitted, and the entry method may then omit its final modifiers in that file.