Some beginners, and some folks with a bit of experience, like myself,
always include opening and closing braces, with constructs such as for-loops and if-statements.
It's also a required/recommended practice by some coding syle guides, such as
JavaRanch's style guide. The reasoning for this is that consistency is easier to read, less editing is involved if lines of code are added or removed, plus it becomes very obvious what code is associated with the construct.
Also, I strongly recommend that you make a practice of properly indenting your code, as this will strongly help in its readability.