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You can keep the end as simple as:
if(!(flag = B > 0 && H > 0))
System.out.println("java.lang.Exception: Breadth and height must be positive");
Since you want to keep it simple lol.
Btw I don't recommend caching an object such as Scanner like that. Its a habit habit for big apps. It won't be deleted from memory that way even thought its not used anywhere else.