test 9 corrections

2)Consider the following code fragment:

int[] r = { 9, 2, 4, 3, 7, 5, 0, 1 };
for ( int t : r )
{
  t = t + 1;
}

Value: 1 point.
Which of the following is a true statement?

1. The code will execute and the elements of the array r will be unchanged.
2. The code will execute and each element of the array r will be incremented.
3. The code will execute and each element of the array r will be the sum of the previous elements.
4. The code will execute and each element t of the array r will be the sum of the first t integers.
5. The code will generate an error.

I got this wrong because I chose 2 believing that changing t would change the array that was incorrect. thus array r would not be changed therefore the answer would be 1.

 3)what is output by the following code fragment? (You may assume that the for-each loop references the array elements in index order.) String[] p = { "A", "B", "C", "D" };
String b = "";

for ( String q : p )
   b = q + b;

System.out.println( b )

7) I got this wrong because I forgot that q+b is diffrent from b+q and beleved that adding onto a string always happened at the end. in hindsight it was kind of a silly mistake the real answer I should have got was DCBA.

 What can be said about the value of d after the comment is replaced by an actual initialization statement and the resulting code is executed? String[] a;

// code to initialize a

boolean d = false;

for ( String b : a )
{
  for ( String c : a )
  {
    if ( b.equals( c ) )
      d = true;
  }
}
I got this wrong because I neglected to test the code if a had nothing in it and thus I missed that a is false if there is nothing in the list. believing that  anything I entered in for a would output true I answered A when in reality it was B (The value is true if a contains at least one element; otherwise it is false).