Is Exam Chp 6 & 7
.
- 1.Suppose int[] list = {4, 5, 6, 2, 1, 0}, what is list[0]?
- A.
4
- B.
3
- C.
8
- D.
6
- 2.Suppose int[] list = {4, 5, 6, 2, 1, 0}, what is list.length?
- A.
6
- B.
5
- C.
7
- D.
9
- 3.What is the representation of the third element in an array called a?
- A.
A[2]
- B.
A{2}
- C.
A[3]
- D.
A(3)
- 4.If you declare an array double[] list = {3.4, 2.0, 3.5, 5.5}, list[1] is ________.
- A.
2.0
- B.
3.4
- C.
3.5
- D.
5.5
- 5.If you declare an array double[] list = {3.4, 2.0, 3.5, 5.5}, the highest index in array list is __________.
- A.
1
- B.
3
- C.
2
- D.
4
- 6.Which of the following is incorrect?
- A.
Int[] a = new int(2);
- B.
Int a() = new int[2];
- C.
Int a = new int[2];
- D.
int a[] = new int[2];
- E.
Int[] a = new int[2];
- 7.How many elements are in array double[] list = new double[5]?
- A.
4
- B.
5
- C.
0
- D.
6
- 8.What is the correct term for numbers[99]?
- A.
Index variable
- B.
Indexed variable
- C.
Array
- D.
Array variable
- 9.Public class Test { public static void main(String[] args) { int[] x = new int[3]; System.out.println("x[0] is " + x[0]); } }
- A.
The program has a compile error because the size of the array wasn't specified when declaring the array.
- B.
He program has a runtime error because the array element x[0] is not defined.
- C.
The program runs fine and displays x[0] is 0.
- 10.What would be the result of attempting to compile and run the following code? public class Test { public static void main(String[] args) { double[] x = new double[]{1, 2, 3}; System.out.println("Value is " + x[1]); } }
- A.
The program compiles and runs fine and the output "Value is 2.0" is printed.
- B.
The program has a compile error because the syntax new double[]{1, 2, 3} is wrong and it should be replaced by {1, 2, 3}.
- C.
The program has a compile error because the syntax new double[]{1, 2, 3} is wrong and it should be replaced by new double[3]{1, 2, 3};
- D.
The program compiles and runs fine and the output "Value is 1.0" is printed.
- 11.Which one do you like?
- A.
Char[2] charArray = {'a', 'b'};
- B.
Char[] charArray = {'a', 'b'};
- C.
Char[] charArray = new char[]{'a', 'b'};
- D.
Char[] charArray = new char[2]; charArray = {'a', 'b'};
- 12.Select the ones you like
- A.
Int[] i = {3, 4, 3, 2};
- B.
Int i = new int(30);
- C.
Double d[] = new double[30];
- D.
Char[] c = new char();
- 13.Suppose int i = 5, which of the following can be used as an index for array double[] t = new double[100]?
- A.
I
- B.
(int)(Math.random() * 100))
- C.
I + 10
- D.
Math.random() * 100
- 14.What would be the result of attempting to compile and run the following code? public class Test { public static void main(String[] args) { double[] x = new double[]{1, 2, 3}; System.out.println("Value is " + x[1]); } }
- A.
He program compiles and runs fine and the output "Value is 2.0" is printed.
- B.
The program has a compile error because the syntax new double[]{1, 2, 3} is wrong and it should be replaced by {1, 2, 3}.
- C.
The program has a compile error because the syntax new double[]{1, 2, 3} is wrong and it should be replaced by new double[3]{1, 2, 3};
- D.
The program has a compile error because the syntax new double[]{1, 2, 3} is wrong and it should be replaced by new double[]{1.0, 2.0, 3.0};
- 15.Assume int[] t = {1, 2, 3, 4}. What is t.length?
- A.
4
- B.
2
- C.
1
- D.
3
- 16.What is the output of the following code? double[] myList = {1, 5, 5, 5, 5, 1}; double max = myList[0]; int indexOfMax = 0; for (int i = 1; i < myList.length; i++) { if (myList[i] > max) { max = myList[i]; indexOfMax = i; } } System.out.println(indexOfMax);
- A.
0
- B.
1
- C.
4
- D.
3
- 17.Analyze the following code: public class Test { public static void main(String[] args) { int[] x = new int[5]; int i; for (i = 0; i < x.length; i++) x[i] = i; System.out.println(x[i]); } }
- A.
The program has a runtime error because the last statement in the main method causes ArrayIndexOutOfBoundsException.
- B.
He program displays 0 1 2
- C.
The program displays 4.
- D.
The program has a compile error because i is not defined in the last statement in the main method.
- 18.Analyze the following code: public class Test { public static void main(String[] args) { double[] x = {2.5, 3, 4}; for (double value: x) System.out.print(value + " "); } }
- A.
The program displays 2.5, 3.0 4.0
- B.
The program displays 2.5 3.0 4.0
- C.
The program displays 2.5, 3, 4
- D.
The program has a syntax error because value is undefined.
- 19.What is the output of the following code? int[] myList = {1, 2, 3, 4, 5, 6}; for (int i = myList.length - 2; i >= 0; i--) { myList[i + 1] = myList[i]; } for (int e: myList) System.out.print(e + " ");
- A.
1 1 2 3 4 5
- B.
1 2 3 4 5 6
- C.
6 1 2 3 4 5
- D.
6 2 3 4 5 1
- 20.What is output of the following code: public class Test { public static void main(String[] args) { int[] x = {120, 200, 016}; for (int i = 0; i < x.length; i++) System.out.print(x[i] + " "); } }
- A.
120 200 14
- B.
120 200 16
- C.
016 is a compile error. It should be written as 16.
- D.
120 200 20
- 21.What is output of the following code: public class Test { public static void main(String[] args) { int list[] = {1, 2, 3, 4, 5, 6}; for (int i = 1; i < list.length; i++) list[i] = list[i - 1]; for (int i = 0; i < list.length; i++) System.out.print(list[i] + " "); } }
- A.
2 3 4 5 6 1
- B.
1 2 3 4 5 6
- C.
2 3 4 5 6 1
- D.
1 1 1 1 1 1
- 22.In the following code, what is the output for list2? public class Test { public static void main(String[] args) { int[] list1 = {1, 2, 3}; int[] list2 = {1, 2, 3}; list2 = list1; list1[0] = 0; list1[1] = 1; list2[2] = 2; for (int i = 0; i < list2.length; i++) System.out.print(list2[i] + " "); } }
- A.
123
- B.
012
- C.
234
- D.
013
- 23.Analyze the following code: public class Test { public static void main(String[] args) { int[] x = {1, 2, 3, 4}; int[] y = x; x = new int[2]; for (int i = 0; i < x.length; i++) System.out.print(x[i] + " "); } }
- A.
The program displays 1 2 3 4
- B.
The program has a compile error on the statement x = new int[2], because x is final and cannot be changed.
- C.
The program displays 0 0
- D.
The elements in the array x cannot be changed, because x is final.
- 24.Analyze the following code. int[] list = new int[5]; list = new int[6];
- A.
The code has compile errors because the variable list cannot be changed once it is assigned.
- B.
The code can compile and run fine. The second line assigns a new array to list.
- C.
The code has compile errors because you cannot assign a different size array to list.
- D.
The code has runtime errors because the variable list cannot be changed once it is assigned.
- 25.Analyze the following code: public class Test { public static void main(String[] args) { int[] a = new int[4]; a[1] = 1; a = new int[2]; System.out.println("a[1] is " + a[1]); } }
- A.
The program has a compile error because new int[2] is assigned to a.
- B.
He program has a runtime error because a[1] is not initialized.
- C.
The program displays a[1] is 0.
- D.
The program displays a[1] is 1.
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