CIS 265 - Spring 2015 Exam-1

CIS 265 - Spring 2015 Exam-1 Fist Name______Last Name______

MULTIPLE CHOICE. (25points) Choose the one alternative that best completes the statement or answers the question. 1) The following code displays ______. double temperature = 50; if (temperature >= 100)

System.out.pri ntln("too hot"); else if (temperature <= 40)

System.out.pri ntln("too cold"); else

System.out.pri ntln("just right");

1) ______just right B) too cold too hot D) too hot too cold just right

Which of the following is the correct expression that evaluates to true if the number x is between 1 and 100 or the number is negative? 2) ______(1 > x > 100) || (x < 0) 1 < x < 100 && x < 0 ((x < 100) && (x > 1)) && (x < 0) ((x < 100) && (x > 1)) || (x < 0)

To check whether a char variable ch is an uppercase letter, you write ______. 3) ______(ch >= 'A' && ch >= 'Z') B) (ch >= 'A' && ch <= 'Z') ('A' <= ch <= 'Z') D) (ch >= 'A' || ch <= 'Z')

What is the output for y? int y = 0; for (int i = 0; i<10; ++i) { y += i; } System.out.pri ntln(y);

4) ______12 B) 45 C) 11 D) 13 E) 10

What is sum after the following loop terminates? int sum = 0; int item = 0; do { item++; sum += item; if (sum >= 4) continue; } while (item < 5);

5) ______16 B) 15 C) 17 D) 18

If you declare an array double[ ] list = {3.4, 2.0, 3.5, 5.5}, the highest index in array list is ______. 6) ______0 B) 2 C) 1 D) 4 E) 3

If you declare an array double[ ] list = {3.4, 2.0, 3.5, 5.5}, list[1] is ______. 7) ______2.0 3.4 5.5 3.4 undefined 8 )

In the following code, what is the printout for list2? 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.pri nt(list2[i] + " "); } }

8) ______1 2 3 B) 0 1 2 C) 1 1 1 D) 0 1 3

______represents an entity in the real world that can be distinctly identified. 9) ______An object B) A data field A method D) A class

10) 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 < y.length; i++)

System.out.pri nt(y[i] + " "); } }

10) ______The program displays 0 0 0 0 B) The program displays 0 0 The program displays 1 2 3 4 D) The program displays 0 0 3 4

11) ______is a construct that defines objects of the same type. 11) ______A class B) A data field A method D) An object

12) An object is an instance of a ______. 12) ______data B) program C) class D) method

13) ______is invoked to create an object. 13) ______A constructor A method with the void return type The main method A method with a return type

14) Given the declaration Circle[ ] x = new Circle[10], which of the following statement is most accurate? 14) ______x contains a reference to an array and each element in the array can hold a reference to a Circle object. x contains a reference to an array and each element in the array can hold a Circle object. x contains an array of ten objects of the Circle type. x contains an array of ten int values.

15) What is the output of the following code? String s = "University"; s.replace("i", "ABC"); System.out.pri ntln(s);

15) ______University B) UnABCversity UniversABCty D) UnABCversABCty

16) You can create an ArrayList using ______. 16) ______new ArrayList[100] B) new ArrayList[ ] ArrayList() D) new ArrayList()

17) Object- oriented programming allows you to derive new classes from existing classes. This is called ______. 17) ______abstraction B) generalization encapsulation D) inheritance

18) What is the return value of "SELECT".sub string(0, 5)? 18) ______"SELECT" B) "SELE" "SELEC" D) "ELECT"

19) Invoking ______removes all elements in an ArrayList x. 19) ______x.clean() x.remove() x.delete() x.clear() x.empty()

20) Suppose ArrayList x contains two strings [Beijing, Singapore]. Which of the following methods will cause the list to become [Beijing, Chicago, Singapore]? 20) ______x.add(1, "Chicago") B) x.add(0, "Chicago") x.add(2, "Chicago") D) x.add("Chicago")

21) Invoking ______returns the first element in an ArrayList x. 21) ______x.get(1) B) x.get() C) x.get(0) D) x.first()

22) Invoking ______returns the number of the elements in an ArrayList x. 22) ______x.length(1) B) x.size() x.getSize() D) x.getLength(0)

23) Inheritance means ______. 23) ______that data fields should be declared private that a variable of supertype can refer to a subtype object that a class can extend another class that a class can contain another class

24) Composition means ______. 24) ______that a class can contain another class that data fields should be declared private that a variable of supertype can refer to a subtype object that a class can extend another class

25) Encapsulation means ______. 25) ______that a class can contain another class that a variable of supertype can refer to a subtype object that data fields should be declared private that a class can extend another class

1 ) A 2 ) D 3 ) B 4 ) B 5 ) B 6 ) E 7 ) A 8 ) B 9 ) A 1 ) 0 C 1 ) 1 A 1 ) 2 C 1 ) 3 A 1 ) 4 A 1 ) 5 A 1 ) 6 D 1 ) 7 D 1 ) 8 C 1 ) 9 D 2 ) 0 A 2 ) 1 C 2 ) 2 B 2 ) 3 C 2 ) 4 A 2 ) 5 C

Exam 1 KEY 1) A 2) D 3) B 4) B 5) B 6) E 7) A 8) B 9) A 10) C 11) A 12) C 13) A 14) A 15) A 16) D 17) D 18) C 19) D 20) A 21) C 22) B 23) C 24) A 25) C