Question about Java ArrayList.

Question 10

Assume that the following code has been executed (same for Questions 7 thru 10):

ArrayList plot = new ArrayList(); Point p = new Point( 12, 16 ); plot.add( p ); plot.add( new Point( 0, 0 ) ); plot.add( new Point( 4, 8 ) ); plot.add( 2, new Point( 5, 10 ) ); p = plot.get( 0 ); p = plot.remove( 1 ); plot.add( new Point( -5, 5 ) );

Which Point is returned by the following expression? plot.get( 5 )

5,10

4,8

None -- the statement throws a runtime exception

The value null is returned

-5,5

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Question 11

Assume that the following code has been executed (same for Questions 11 thru 14):

ArrayList nums = new ArrayList(); nums.add( 12 ); nums.add( 32 ); nums.add( 15 ); nums.add( 2, 11 ); nums.add( 6 ); int s = nums.size() ; int sum = 0; Iterator it = nums.iterator(); while( it.hasNext() ) { int n = it.next(); if ( n % 2 == 1 ) sum = sum + n; } nums.remove( 0 ); 

What is the value of the variable 's'?

5

6

4

7

2

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Question 12

Assume that the following code has been executed (same for Questions 11 thru 14):

ArrayList nums = new ArrayList(); nums.add( 12 ); nums.add( 32 ); nums.add( 15 ); nums.add( 2, 11 ); nums.add( 6 ); int s = nums.size(); int sum = 0; Iterator it = nums.iterator(); while( it.hasNext() ) { int n = it.next(); if ( n % 2 == 1 ) sum = sum + n; } nums.remove( 0 );

What is the value of the variable 'sum'?

26

50

15

76

78

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Question 13

Assume that the following code has been executed (same for Questions 11 thru 14):

ArrayList nums = new ArrayList(); nums.add( 12 ); nums.add( 32 ); nums.add( 15 ); nums.add( 2, 11 ); nums.add( 6 ); int s = nums.size(); int sum = 0; Iterator it = nums.iterator(); while( it.hasNext() ) { int n = it.next(); if ( n % 2 == 1 ) sum = sum + n; } nums.remove( 0 );

How many elements remain on the list when the code is finished executing?

6

1

7

5

4

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Question 14

Assume that the following code has been executed (same for Questions 11 thru 14):

ArrayList nums = new ArrayList(); nums.add( 12 ); nums.add( 32 ); nums.add( 15 ); nums.add( 2, 11 ); nums.add( 6 ); int s = nums.size(); int sum = 0; Iterator it = nums.iterator(); while( it.hasNext() ) { int n = it.next(); if ( n % 2 == 1 ) sum = sum + n; } nums.remove( 0 );

What is the value of the first element remaining on the list?

32

11

12

6

15