You can only use java on english?

Question

Because many people doesnt know the idiom

Answer 1

All the classes and types that come with Java are named English. You can name your variables/classes in any other language but it's not common to do that.

Answer 2

No, You can only use english on java.

Answer 3

The standard Java keywords and packages are just like that: for, while, System, out... But the texts that you print to the users of your Java app can be in any language of your choice.