(TCOs 1ñ6) The column names that are displayed in a JTable can be specified by u
ID: 2246647 • Letter: #
Question
(TCOs 1ñ6) The column names that are displayed in a JTable can be specified by using the _____ method of the DefaultTableModel.
.formatColumns
.setColumns
.setColumnNames
.setColumnIdentifiers
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Question 2 4 pts
(TCOs 1ñ6) What is the output of the code below?
double num = 56.4321;
System.out.printf("%.2f", 56.4321);
%.2f
%.2f56.4321
56.43
56.4321
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Question 3 4 pts
(TCOs 1ñ6) The signature of a method consists of
method name and parameter list.
return type
method name.
parameter list.
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Question 4 4 pts
(TCOs 1ñ6) Assume int[ ] t = {1, 2, 3, 4}. What is t.length?
5
4
0
3
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Question 5 4 pts
(TCOs 1 ,2, and 6) If a class contains a main method, that method is executed
automatically when the class is run.
when another method within the class calls it.
when an object is created from the class.
None of the above
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Question 6 4 pts
(TCOs 1ñ6) Invoking _____ returns the first element in an ArrayList x.
x.get(1)
x.get()
x.get(0)
x.first()
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Question 7 4 pts
(TCO 1, 4, and 6) The maximum number of radio buttons that can be selected within a ButtonGroup is
1.
2.
5.
all.
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Question 8 4 pts
(TCOs 1ñ6) Which statements are most accurate regarding the following classes?
class A {
private int i;
protected int j;
}
class B extends A {
private int k;
protected int m;
}
An object of B contains data fields j, m.
An object of B contains data fields j, k, m.
An object of B contains data fields k, m.
An object of B contains data fields i, j, k, m.
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Question 9 4 pts
(TCOs 1ñ6) Suppose ArrayList x contains two strings [Beijing, Singapore]. Which of the following methods will cause the list to become [Beijing, Chicago, Singapore]?
x.add("Chicago")
x.add(2, "Chicago")
x.add(0, "Chicago")
x.add(1, "Chicago")
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Question 10 4 pts
(TCOs 1, 5, and 6) The StringTokenizer method used to return the next field based on the delimiter character specified is
nextField.
nextToken.
Token.
Field.
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Question 11 4 pts
(TCOs 1ñ6) Which of the following statements causes the program to terminate when closing the frame?
frame.setDefaultCloseOperation(null)
frame.setDefaultCloseOperation(JFrame.STOP_ON_CLOSE)
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE)
frame.setDefaultCloseOperation(JFrame.TERMINATE_ON_CLOSE)
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Question 12 4 pts
(TCOs 1, 5, and 6) Which type of exception occurs if the write method of BufferedWriter cannot write data to the file?
WriteException
IOException
FileIOException
FileException
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Question 13 4 pts
(TCOs 1ñ6) What layout manager should you use so that every component occupies the same size in the container?
any layout
a FlowLayout
a BorderLayout
a GridLayout
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Question 14 4 pts
(TCOs 1ñ6) The event handler (e.g., actionPerformed) is a method in
both source and listener object.
the EventObject class.
a listener object.
a source object.
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Question 15 4 pts
(TCOs 1ñ6) The _____ method of JOptionPane is used to display a message dialog box.
showMessage
displayMessageDialog
showMessageDialog
displayMessage
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Question 16 4 pts
(TCOs 1, 4, and 6) Menus are attached to windows by calling the _____ method.
addMenuBar
setJMenuBar
setMenu
addJMenuBar
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Question 17 4 pts
(TCOs 1ñ6) Suppose you wish to provide an accessor method for a double instance variable named percent, what should the signature method be?
public static void getPercent()
public double getPercent()
public int getPercent()
public void getPercent()
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Question 18 4 pts
(TCOs 1, 4, and 6) The method used to add panels to a JTabbedPane is
newTab.
newPanel.
addPanel.
addTab.
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Question 19 4 pts
(TCOs 1ñ6) A constructor cannot
be overloaded.
initialize variables to their defaults.
specify return types or return values.
have the same name as the class.
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Question 20 4 pts
(TCOs 1ñ6) Given the declaration Circle x = new Circle(), which of the following statements is most accurate?
x contains an int value.
You can assign an int value to x.
x contains an object of the Circle type.
x contains a reference to a Circle object.
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Question 21 4 pts
(TCOs 1, 5, and 6) To add a database driver to a NetBeans project, you can add the JAR file for the driver to what folder?
The Source Packages folder
The Libraries folder
The Files folder
The Services folder
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Question 22 4 pts
(TCOs 1ñ6) _____ represents an entity in the real world that can be distinctly identified.
A class
An object
A data field
A method
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Question 23 4 pts
(TCOs 1ñ6) To execute the query "select * from Address" using the Statement object named stmt that has been properly configured with a database connection, use
stmt.executeUpdate("select * from Address");.
stmt.execute("select * from Address");.
stmt.executeQuery("select * from Address");.
stmt.query("select * from Address");.
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Question 24 4 pts
(TCOs 1ñ6) Suppose that your program accesses a MySQL database. Which of the following statements is false?
If the database is not available, the program will have a runtime error when attempting to create a connection object.
If the driver for MySQL database is not in the classpath, the program will have a runtime error, indicating that the driver class cannot be loaded.
If the driver for MySQL database is not in the classpath, the program will have a syntax error.
If the database connection cannot be made, a SQLException occurs.
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Question 25 4 pts
(TCOs 1ñ6) Which of the following statements is false?
PreparedStatement is for SQL SELECT statements only. You cannot create a PreparedStatement for SQL UPDATE statements.
The parameters in a prepared statement are denoted using the ? sign.
PreparedStatement is efficient for repeated executions.
The first parameter in a perpared statement is number 1.
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Question 26 4 pts
(TCOs 1ñ6) Which method can be used to write data to a text file opened with the BufferedWriter object outfile?
outfile.newLine();
outfile.existLine();
Write(outfile);
outfile.write();
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Question 27 4 pts
(TCOs 1ñ6) Which type of exception occurs when creating a BufferedReader object for a nonexistent file?
FileNotExist
FileNotFound
FileNotExistException
FileNotFoundException
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Question 28 4 pts
(TCOs 1ñ6) Which class can be used to write data into a text file?
File
BufferedWriter
FileWrite
WriteFile
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Question 29 4 pts
(TCOs 1ñ6) Result set meta data are retrieved through
a Statement object.
a Connection object.
a ResultSet object.
a PreparedStatement object.
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Question 30 4 pts
(TCOs 1ñ6) Clicking a JCheckBox object generates _____ events.
ComponentEvent
ContainerEvent
ActionEvent
JCheckBoxEvent
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Question 31 4 pts
(TCOs 1ñ6) The method _____ gets the contents of the text field txtName.
txtName.findString()
txtName.getText(s)
txtName.getString()
txtName.getText()
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Question 32 4 pts
(TCOs 1ñ6) The method _____ appends a string s into the text area jta.
jta.appendText(s)
jta.append(s)
jta.setText(s)
jta.insertText(s)
Explanation / Answer
1. .set columnnames.
constructs a DefaultTableModel and initializes the table by passing data and columnnames to the SetDatvector method.
3.The signature of a method consists of the method name, parmeter profile, but not the return type. A class cannot have the methods with identical signature.
4.The t.length is 4.
5. When the object is created from the class
6. x.get(0)
7.The minimum number of radio buttons in a group is two and the maximm is seven.
8.An object of B contains data fields i,j,k,m.
9. x.add(1,"Chicago")
10. next token.
11. frame.setDefaultCloseOperation(jFrame.EXIT_ON_CLOSE)
12 .IOException.
13 . GridLayout.
14. the event object class.
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