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Dan's Exam Array Doubt

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HI All,
Can't understand the output of the question of following questions.
Method Arguments
Exam 1
Any further explanation to make it more clear ??

9 a Prints: 1,1 Although the reference parameter i1 is reassigned inside of m1, the change has no impact outside of m1. Array references are passed by value: the invoked method gets a copy of the array reference.

11 d Prints: 3,1 Inside of method m2, the local variables i1 and i2 remain unchanged while the shadowed instance variables are changed.
Thanks in advance,
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In Question 9:
i1 passed in method m1 is a "local copy" of i1 in method m1.Any operation on it will not effect the m1 of Class GFC306 out side the method.But i2 is different,as there is not a variable named i2,this.i2(the class variable )will be used.
In Question 11:
pay atention in "this" means the class itsself
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