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Exam 7: Arrays and Arraylists

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Question 21

Multiple Choice

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Which set of statements totals the values in two-dimensional int array items?

A) int total = 0;
For ( int subItems : items )
For ( int item : subItems )
Total += item;
B) int total = 0;
For ( int item: int[] subItems : items )
Total += item;
C) int total = 0;
For ( int[] subItems : items )
For ( int item : items )
Total += item;
D) int total = 0;
For ( int[] subItems : items )
For ( int item : subItems )
Total += item;

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Question 22

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Invalid possibilities for array indices include .

A) Positive integers.
B) Negative integers.
C) Zero.
D) None of the above.

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Question 23

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In array items,which expression below accesses the value at row 3 and column 4?

Which expression adds 1 to the element of array arrayName at index i?

Consider the array: s[ 0 ] = 7 S[ 1 ] = 0 S[ 2 ] = -12 S[ 3 ] = 9 S[ 4 ] = 10 S[ 5 ] = 3 S[ 6 ] = 6 The value of s[ s[ 6 ] - s[ 5 ] ] is:

Consider the code segment below.Which of the following statements is false? int[] g; G = new int[ 23 ];

An argument type followed by a(n) in a method's parameter list indicates that the method receives a variable number of arguments of that particular type.

Consider array items,which contains the values 0,2,4,6 and 8.If method changeArray is called with the method call changeArray( items,items[ 2 ] ) ,what values are stored in items after the method has finished executing? public static void changeArray( int[] passedArray,int value ) { PassedArray[ value ] = 12; Value = 5; } // end method changeArray

Which statement correctly passes the array items to method takeArray? Array items contains 10 elements.

Which of the following initializer lists would correctly set the elements of array n?

A programmer must do the following before using an array:

Attempting to access an array element out of the bounds of an array,causes a(n) .

Which of the following tasks cannot be performed using an enhanced for loop?

Class Arrays provides method __________ for comparing arrays.

For the array in the previous question,what is the value returned by items[ 1 ][ 0 ]?

Which of the following will not produce a compiler error?

An array with m rows and n columns is not: a) An m-by-n array. b) An n-by-m array. c) A two-dimensional array. d) A dual-transcripted array.

Class Arrays methods sort,binarySearch,equals and fill are overloaded for primitive-type arrays and Object arrays.In addition,methods __________ and __________ are overloaded with generic versions.

Which set of statements totals the items in each row of two-dimensional array items,and displays each total?

The preferred way to traverse a two-dimensional array is to use .