Answer Posted / anu

Applets are divided into two categories: trusted and
untrused. Trusted applets are not subject to any security
restrictions and can therefore open connections to any host
at will; untrusted applets are subject to the security
restrictions described below.
When an applet is loaded a check is first made to see if an
applet by that name (the value of the CODE attribute in the
APPLET tag) exists in the classpath (if none was explicitly
set, then just the internal default classpath is used); if
so, the applet found in the classpath is loaded. Applets
loaded this way are considered trusted. If no applet by the
requested name is found in the classpath then it is loaded
from the location specified by the combination of urls used
to load the page containing the applet and in the CODEBASE
attribute. Applets loaded this way are considered untrusted

What is private static class in java?

1021

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What is byte code and why is it important to java’s use for internet programming?

1134

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How do you add an element to a hashset in java?

1010

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What is the largest number a double can hold?

1047

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What is the nested interface?

1111

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What are the advantages and disadvantages of object cloning?

1110

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What is a “stateless” protocol ?

994

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How to create packages in java?

953

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The following program reads data (details of students) from a file named students.txt and converts it into e-mail addresses. The results are written to a file named studentemail.txt. students.txt consists of a number of lines, each containing the data of a student in colon delimited format: Last Name:First Name:Student Number Each input record is converted to an e-mail address and written to studentemail.txt in the following format: the first character of the last name + the first character of the first name + the last four digits of the student number + “@myunisa.ac.za” import java.io.*; public class EmailConverter { public static void main(String[] args) throws IOException { BufferedReader input = new BufferedReader(new FileReader ("students.txt")); PrintWriter output = new PrintWriter(new FileWriter ("studentemail.txt")); String line = input.readLine(); while (line != null) { // Extract the information for each student String[] items = line.split(":"); // Generate the email address String email = "" + items[0].charAt(0) + items[1].charAt(0) + items[2].substring(4,8) + "@myunisa.ac.za"; email = email.toLowerCase(); // Output output.println(email); line = input.readLine(); } input.close(); output.close(); } } Rewrite the class so that it handles possible errors that may occur. In particular, it should do the following: • It should catch at least three appropriate exceptions that might occur, and display suitable messages. • At this stage, the program will not run correctly if there is an empty line in the input file. Change the program so that if an empty line is encountered, an exception is thrown and the empty line is ignored. This exception should be handled with the display of a suitable error message. • Before the e-mail address is added to the output file, check if the student number has 8 digits. If not, throw an InvalidFormatException (which the program should not handle itself)

1947

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Can an interface be defined inside a class?

1066

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What are the disadvantages of object oriented programming?

1281

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There are two classes named classa and classb. Both classes are in the same package. Can a private member of classa can be accessed by an object of classb?

1494

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What is nullpointerexception in java?

1162

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What is a line break?

1033

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What is the benefit of lambda expressions?

1067

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