Statements of which of the following kind should be placed at locations in the class block code at which the event should be raised?
(A) Public Event UserDefinedEvent(par1 As dataType1,
par2 As dataType2, ...)
(B) RaiseEvent UserDefinedEvent(arg1, arg2, ...)
(C) Dim WithEvents object1 As ClassName
(D) Private Sub object1_UserDefinedEvent(par1, par2, ...) _
Handles object1.UserDefinedEvent
(B) RaiseEvent UserDefinedEvent(arg1, arg2, ...)
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A(n) __________ is used in a function template to specify a generic data type.
a. dummy variable b. exception c. catch block d. type parameter e. None of these
Create an application that stores people’s names and birthdays in a file (Fig. 25.49). The user creates a file and inputs each person’s first name, last name and birthday in the application. The information is then written to the file, as shown in the right image of Fig. 25.49. Note that only the month and day are written to the file.
a) Copying the template to your working directory. Copy the directory C:Examples Tutorial25ExercisesBirthdaySaver to your C:SimplyJava directory.
b) Opening the template file. Open the BirthdaySaver.java file in your text editor.
c) Viewing the PrintWriter instance variable. In lines 29–30, view the PrintWriter
instance variable named output that will be used to write output to a file.
d) Opening a JFileChooser dialog. For this exercise, you will define only the open- FileJButtonActionPerformed method (lines 160–163 in the template). Functional- ity for writing data to a file and closing a file is provided in the template. Starting on line 163, add and display a new JFileChooser to allow the user to select the file to which to write. Then, define an if statement that causes the method to be exited if the user clicks the Cancel JButton.
e) Validating the file name. Retrieve the file selected by the user (as a File object) and the name of the file. Create a File object, selectedFile
Which of the following is a secure protocol that can be used to protect IM and presence information?
A. Password Authentication Protocol (PAP) B. NT LAN Manager (NTLM) C. Extensible Message and Presence Protocol (XMPP) D. Challenge Authentication Protocol (CHAP)
Which of the following statements is INCORRECT?
a. Values stored in TreeSet are automatically sorted b. Vector does not allow duplicate elements c. arrayList can duplicate elements d. TreeSet does not allow duplicate elements