How to implement translation?

Question

Java

The issue is resolved, I wrote the code according to the books.
Good evening, dear users,
please help with translating to java.
That is, I write the word "Ghbdtn" in English in the wrong layout so that the text is converted to "Hello".
I understand the algorithm of actions, but I do not know the syntax of java. In this regard, I ask for help! :)