Dan's Exam Array Doubt

[Vishy Karl]

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

 
Question 9
class GFC306 {
  static int[] i1 = {1}, i2 = {3};
  static void m1(int[] i1) {
    int[] i3 = i1; i1 = i2; i2 = i3;
  }
  public static void main (String[] args) {
    m1(i1);
    System.out.print(i1[0] + "," + i2[0]);
}}
What is the result of attempting to compile and run the program? 
a.  Prints: 1,1 
b.  Prints: 1,3 
c.  Prints: 3,1 
d.  Prints: 3,3 
e.  Run-time error 
f.  Compile-time error 
g.  None of the above 
 

Answer
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.
and

 
Question 11
class GFC308 {
  int[] i1 = {1}, i2 = {3};
  void m1() {
    m2(i1, i2);
    System.out.print(i1[0] + "," + i2[0]);
  }
  void m2(int[] i1, int[] i2) {
    int[] i3 = i1;
    this.i1 = i2;
    this.i2 = i3;
  }
  public static void main (String[] args) {
    new GFC308().m1();
}}
What is the result of attempting to compile and run the program? 
a.  Prints: 0,0 
b.  Prints: 1,1 
c.  Prints: 1,3 
d.  Prints: 3,1 
e.  Prints: null,null 
f.  Run-time error 
g.  Compile-time error 
h.  None of the above 
 

Answer
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,

[guo mark]

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