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CIS 265 – Sect 01 - V. Matos Exam-2 Spring-2015

First Name______Last Name ______ID# ______

(15 pts) MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1 In the following method, what is the base case? static int xMethod(int n) { if (n == 1) return 1; else return n + xMethod(n - 1); }

1) ______n is 1. B) n is greater than 1. no base case. D) n is less than 1.

What is the return value for xMethod(4) after calling the following method? static int xMethod(int n) { if (n == 1) return 1; else return n + xMethod(n - 1); }

2) ______12 B) 9 C) 10 D) 11

Analyze the following code: public class Test { public static void main(String[ ] args) { int[ ] x = {1, 2, 3, 4, 5}; xMethod(x, 5); }

public static void xMethod(int[ ] x, int length) {

System.out.p rint(" " + x[length - 1]); xMethod(x, length - 1); } }

3) ______The program displays 5 4 3 2 1. The program displays 1 2 3 4 6. The program displays 1 2 3 4 5 and then raises an ArrayIndexOutOfBoun dsException. The program displays 5 4) 4 3 2 1 and then raises an ArrayIndexOutOfBoun dsException.

Analyze the } following two programs: A: public class Test { public static void main(String[ ] args) { xMethod(5); }

public static void xMethod(int length) { if (length > 1) {

System.out.p rint((length - 1) + " "); xMethod(len gth - 1); } } }

B: public class Test { public static void main(String[ ] args) { xMethod(5); }

public static void xMethod(int length) { while (length > 1) {

System.out.p rint((length - 1) + " "); xMethod(len gth - 1); } } 4) ______The two programs produce the same output 1 2 3 4. Program A produces the output 4 3 2 1 and Program B prints 4 3 2 1 1 1 .... 1 infinitely. The two programs produce the same output 4 3 2 1. The two programs produce the same output 1 2 3 4 5. The two programs produce the same output 5 4 3 2 1.

To declare a class named A with a generic type, use 5) ______public class A { ... } B) public class A(E, F) { ... } public class A(E) { ... } D) public class A { ... }

Suppose List list = new ArrayList. Which of the following operations are correct? 6) ______list.add(new ArrayList()); B) list.add("Red"); list.add(new Integer(100)); D) list.add(new java.util.Date());

To create a list to store integers, use 7) ______ArrayList list = new ArrayList(); ArrayList list = new ArrayList(); ArrayList