Question
Question 11 What are the values of i and sum after this code sequence is executed? int i = 0; int sum = 0; for
Question 11
What are the values of i and sum after this code sequence is executed?
int i = 0; int sum = 0; for ( i = 0; i < = 40; i++) {
if ( i % 10 = = 0)
sum += i ;
}
a. | i is 40 sum is 60 | |
b. | i is 41 sum is 60 | |
c. | i is 40 sum is 100 | |
d. |
i is 41 sum is 100 |
2.5 points
Question 12
What is the output of the following code sequence:
double a = 16 / 5; System.out.println( a );
a. | 2.6 | |
b. | 3.2 | |
c. | a | |
d. | 3.0 |
2.5 points
Question 13
Given code:
public abstract class A{ } public class B extends A { }
The following code sequence would correctly create an object reference of class A holding an object reference for an object of class B:
A c; c = new B();
True
False
2.5 points
Question 14
Given the following code declaring and initializing two int variables x and y with respective values 7 and 9, answer question 14 indicating whether the value of the expression is true or false.
int x = 7; int y = 9;
Expression: ( y x == 0 || ( x + 2 ) != y)
True
False
2.5 points
Question 15
Class SimpleDate encapsulates integer instance variables month, day and year. Consider the following equals method in class SimpleDate:
public boolean equals( Object o ) { if ( !( d instanceof SimpleDate ) )
return false;
( Insert appropriate code from selections below)
if ( month == d1.month
&& day == d1.day && year == d1.year )
return true;
else
return false;
}
Which statement(s) could be used to complete the above method body code correctly?
a. | SimpleDate d1; d1 = (SimpleDate)o; | |
b. |
SimpleDate d1 = o; | |
c. |
SimpleDate d1 = (SimpleDate)o; | |
d. |
Both a and c |
2.5 points
Question 16
Which of the following is not a valid wrapper class?
a. | Integer | |
b. | Double | |
c. | Char | |
d. | Boolean |
2.5 points
Question 17
What is the output of this code sequence:
double [ ][ ] a =
{{ 12.5, 48.3, 65.0, 77.1 }, { 65.0, 48.3, 12.5}};
System.out.println( a[1][ 3 ] );
a. |
An ArrayIndexOutOfBounds exception would be thrown. | |
b. |
77.1 | |
c. |
65.0 | |
d. |
12.5 |
2.5 points
Question 18
What is the output of this code sequence?
double [ ] [ ] a =
{{ 100.4, 99.6, 48.2, 65.8 }, { 100.5, 99.7, 48.2, 65.8 }};
double temp = a[0][1];
for ( int i = 1; i < a.length; i++ )
for ( int j = 1; j < a[i].length; j++ )
{
if ( a[i][j] > temp )
temp = a[i][j];
}
System.out.println( temp );
a. | 99.6 | |
b. | 100.4 | |
c. | 99.7 | |
d. | 100.5 |
2.5 points
Question 19
Which statement(s) will instantiate a double array of 6 total elements?
a. |
double [] [] cellbills = new double[2][]; cellbills[0] = new double[4]; cellbills[1] = new double[2]; | |
b. |
double [] [] cellbills = { { 45.24, 54.67, 42.55, 44.61, 65.29 }, { 7 } }; | |
c. |
Both a and b | |
d. |
None of the above |
2.5 points
Question 20
Given an array int a [][] = new int[3][4] ,how do you access the element of array a located in the third row and the fourth column?
a. |
a[3][4] | |
b. |
a( 2,3 ) | |
c. |
a{3}{4} | |
d. |
a[2][3] |
Step by Step Solution
There are 3 Steps involved in it
Step: 1
Get Instant Access to Expert-Tailored Solutions
See step-by-step solutions with expert insights and AI powered tools for academic success
Step: 2
Step: 3
Ace Your Homework with AI
Get the answers you need in no time with our AI-driven, step-by-step assistance
Get Started