1. Which of these is preferred in JAVA and why?int a []; int [] a;2. Consider the following code. What error occurs and why? 3. Write a single line of code that enters even numbers from 2 to 10 in an array of integers called a.4. Construct a method signature for a method called arrayAverage that returns a double and accepts an array of type double called rr.5. Construct a method signature that returns nothing but accepts...