Section 1
Preview this deck
Which statement correctly passes the array items to method takeArray? Array items contains 10 elements.
Front
| 5 | 0 | ||
| 4 | 0 | ||
| 3 | 0 | ||
| 2 | 0 | ||
| 1 | 0 |
Active users
0
All-time users
0
Favorites
0
Last updated
6 years ago
Date created
Mar 14, 2020
Cards (88)
Section 1
(50 cards)
Which statement correctly passes the array items to method takeArray? Array items contains 10 elements.
takeArray( items )
Using the protected keyword gives a member:
package access
Overriding a method differs from overloading a method because:
Overridden methods have the same signature.
The default implementation of method clone of Object performs a ________.
shallow copy
Which of the following statements is false?
Information in the memory unit is persistent—it is retained when the computer's power is turned off
Which class provides prebuilt dialog boxes that enable programs to display windows containing messages (such windows are called message dialogs)?
JOptionPane
Static class variables:
are shared by all objects of a class.
The Java API consists of import declarations.
false
Declaring main as ________ allows the JVM to invoke main without creating an instance of the class.
static.
Objects are marked for garbage collection by method finalize.
false
Which of the following should usually be private?
Variables (or fields).
Attributes of a class are also known as:
fields
Which of the following is not a control structure:
Declaration Structure
What do the following statements do? double[] array; array = new double[ 14 ]; Answer
Create a double array containing 14 elements.
In this question, assume a class, Book, has been defined. Which set of statements creates an array of Book objects?
Book[] books; books = new Book[ numberElements ];
Stacks are known as ________ data structures.
LIFO
________ models software in terms similar to those that people use to describe real-world objects.
Object-oriented design
When should a program explicitly use the this reference?
Accessing a field that is shadowed by a local variable.
Instance variables declared final do not or cannot:
Be modified.
A well-designed method
performs a single, well-defined task.
In a class containing methods with the same name, the methods are distinguished by:
(a) and (b).
Suppose method1 is declared as void method1 ( int a, float b ) Which of the following methods correctly overloads method1?
void method1 ( float a, int b ).
What does the expression x %= 10 do?
Divides x by 10 and stores the remainder in x.
Every class in Java, except ________, extends an existing class.
Object
Which command executes the Java class file Welcome.class?
java Welcome
int x = 9; double y = 5.3; result = calculateValue( x, y ); Which of the following statements is false?
x and y are parameters.
Which statement creates a random value from the sequence 2, 5, 8, 11 and 14. Suppose randomNumbers is a Random object.
2 + 3 * randomNumbers.nextInt( 5 );
Which of the following statements about a do...while repetition statement is true?
The body of a do...while loop is always executed at least once.
An overloaded method is one that
has the same name as another method, but different parameters (by number, types or order of the types).
A class within a package must be declared public if
It will be used by classes that are not in the same package.
A(n) ________ enables a program to read data from the user.
Scanner
Which statement best describes the relationship between superclass and subclass types?
A subclass reference can be assigned to a superclass variable, but a superclass reference cannot be assigned to a subclass variable.
What is the difference between a float and a double?
Double variables store numbers with larger magnitude and finer detail.
Every Java application is composed of at least one:
public class declaration
Superclass methods with this level of access cannot be called from subclasses.
private
Failure to prefix the superclass method name with the keyword super and a dot (.) separator when referencing the superclass's method causes ________.
infinite recursion
Arrays are:
fixed-length entities.
Which of the following is not a Java primitive type?
real
Which of the following statements about the break statement is false?
The break statement, when executed in a while, for or do...while, skips the remaining statements in the loop body and proceeds with the next iteration of the loop.
When a subclass constructor calls its superclass constructor, what happens if the superclass's constructor does not assign a value to an instance variable?
The program compiles and runs because the instance variables are initialized to their default values
An advantage of inheritance is that:
Objects of a subclass can be treated like objects of their superclass.
is a graphical language that allows people who design software systems to use an industry stan¬dard notation to represent them.
The Unified Modeling Language
Which method call converts the value in variable stringVariable to an integer?
Integer.parseInt( stringVariable ).
The import declaration import *; ________.
causes a compilation error.
When no access modifier is specified for a method or variable, the method or variable:
Has package access.
To declare a method as static, place the keyword static before ________ in the method's declaration.
static
To exit out of a loop completely, and resume the flow of control at the next line in the method, use _______.
A break statement.
Attempting to access an array element out of the bounds of an array, causes a(n)
ArrayIndexOutOfBoundsException.
What is the result value of c at the end of the following code segment? int c = 8; c++; ++c; c %= 5; Answer
0
A programmer must do the following before using an array:
declare then create the array.
Section 2
(38 cards)