Test
Java (Multimedia Approach) Ch 6,7,9
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Preguntas del test (38)
1The name of the method and the data types of the method's return type and the types of its parameters is described as the method's signature.
- AVerdadero
- BFalso
2A class inherits the constructors of its superclass.
- AVerdadero
- BFalso
3In Java, it is not possible to create an object instance of an abstract class.
- AVerdadero
- BFalso
4If I wish to create a variable FICA which has the value 0.062 and the value of the variable is not allowed to change, we can declare it as ____________.
- Aprivate double FICA = 0.062;
- Bfinal double FICA = 0.062;
- Cpublic double FICA = 0.062;
- Dprotected double FICA = 0.062;
- Econst double FICA = 0.062;
5If a class is created primarily to create subclasses, it should be declared as ____________.
- Asuper
- B final
- Cprivate
- Doverload
- E abstract
6A subclass of an abstract class must implement all abstract methods in its parent class.
- AVerdadero
- BFalso
7True or False? Final methods can be overloaded.
- AVerdadero
- BFalso
8Allowing an object to select to select a particular behavior is best associated with ________.
- Aoverloading a method
- Bmultilevel inheritance
- Chierarchical inheritence
- Doverriding a method
- Epolymorphism
9In order for a object of a subclass type to access the superclass' variables directly, the variables must be declared as _______.
- A private, public, or protected
- Bprotected
- Cprivate
- Dpublic or protected - but not private
- Epublic
10True or False? A panel can contain other panels.
- AVerdadero
- BFalso
11True or False? The FlowLayout class can be used to create a layout in which all components are placed in a single column within the container.
- AVerdadero
- BFalso
12The content pane is obtained using the getContentPane method of the ______ class.
- AJPanel
- BJButton
- CJFrame
- DJComponent
- EJayZ
13In order to get a row of buttons, one can use the ______ layout manager.
- ABorderLayout
- BFlowLayout
- CBoxLayout
- DGridLayout
- ELayabout
14When a user clicks on a push button on the GUI it generates an ActionEvent.
- AVerdadero
- BFalso
15The setBackground method is a method of the JFrame class.
- AVerdadero
- BFalso
16It is possible to create Border objects for a panel by using the _______ class.
- ABorderFactory
- BBorderLayout
- CGridLayout
- Dnone of these
- EGrid
17Before events can be captured it is necessary to add a/an ______ to the component.
- A ActionCommand
- Bmouse object
- CActionListener
- Dnone of these
- Egraphics object
18Within a set of check buttons representing options, only one can be selected.
- AVerdadero
- BFalso
19The JFileChooser() class is an example of a class which can generate a dialog.
- AVerdadero
- BFalso
20To create a Java program that uses a GUI interface, which of the following must be done?
- Aall of these
- Bimplement listener classes
- Cestablish relationships between the listeners and the components
- Dcreate and set up components
- Enone of these
21Which of the following method will retrieve the text displayed on a object of the JButton class?
- Anone of these
- BgetValue
- CgetText()
- Dall of these
- EgetActionCommand()
22Within a set of check buttons representing options, only one can be selected.
- AVerdadero
- BFalso
23True or False? The size of an array can be printed out using the length method.
- AVerdadero
- BFalso
24The JSlider class fires a ________ event when it is manipulated.
- AActionEvent
- BItemEvent
- CNone of these
- DChangeEvent
- EClickEvent
25Which of the following statements creating an array is valid?
- A int[] array = new int(10);
- Bint[] array = new int[10];
- Carray = {10, 20, 40};
- Dint array = new int[10];
26True or False? An existing array can be populated with an initializer list.
- AVerdadero
- BFalso
27True or False? Arrays of only primitive types, and not reference types, can be sorted using the sort method in the java.util.Arrays class.
- AVerdadero
- BFalso
28What is the output of the following program?
public enum Planets {
MERCURY,
EARTH,
MARS,
JUPITER;
public static void main(String[] args) {
Planets planet;
planet = MARS;
System.out.println(planet.ordinal());
}
}- A1
- B2
- C3
- D4
29True or False? An existing array can be populated with an initializer list.
- AVerdadero
- BFalso
30True or False? Arrays of only primitive types, and not reference types, can be sorted using the sort method in the java.util.Arrays class.
- AVerdadero
- BFalso
31True or False? It is not possible to create an object of an enum using the new operator.
- AVerdadero
- BFalso
32True or False? If I have an array
char[] charArr = {'J','a','v','a'};
I can convert it to a string by using the following constructor:
String str1 = new String(charArr);- AVerdadero
- BFalso
33Which of the following structures would be best to use if we wish to store information about a chess board?
- Aan ArrayList
- Ba two-dimensional array
- Ca Point
- Dan enum
34Suppose I have an ArrayList declared as follows:
ArrayList list = new ArrayList();
I wish to print out the number of elements in list. Which statement would do this?- ASystem.out.println(list.size);
- BSystem.out.println(list.size());
- CSystem.out.println(list.length());
- Dany of these
- ESystem.out.println(list.length);
35Suppose I have the following Strings:
String s1 = "A string";
String s2 = new String("A string");
String s3 = new String("A string");
which of the following comparisons will yield a true?- Anone of these will be true.
- Bs2 == s3
- C s1 == s3
- D s1 == s2
- Eall of these will be true
36True or False? It is possible to change the size of an ArrayList object at run time by using the .add method.
- AVerdadero
- BFalso
37True or False? To find out how many elements there are in an ArrayList use the size() method.
- AVerdadero
- BFalso
38In order to check to see that two String objects contain the same string (the same characters in the same order) it is best to _______.
- Anone of these.
- Bcompare using the substring method.
- Cuse the length() method to compare the sizes of both strings.
- Duse the .equals method
- Ecompare them with the == operator.
Información
- Descripción
- C2 Java Programming Test sobre Java (Multimedia Approach) Ch 6,7,9, creado por johnrclark12 el 07/11/2014.
- Autor
- johnrclark12
- Idioma
- English
- Visitas
- 14
- Etiquetas
- Valoración
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