Interested to Buy Any Domain ? << Click Here >> for more details...
Answer Posted / al rahid
1. Declare the Class as final (this inherently makes all
member function final)
2. Declare member variables private (not necessarily final,
because private instance variable are accessed via public
member functions only, e.g. in java.lang.String class,
variable "hash" is declared as "private int hash;" with no
final keyword).
| Is This Answer Correct ? | 2 Yes | 1 No |
Post New Answer View All Answers
What happens if we don’t override run method ?
Is singleton a bad practice?
What is difference between adapter class and listener?
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)
How destructors are defined in java?
What is data movement?
How do you check whether the list is empty or not in java?
What is the difference between the direct buffer and non-direct buffer in java?
What do you mean by global variable?
When can you say a graph to be a tree?
Explain the difference between protected and default access.
What are the methods available in a class?
How do you create a sop?
What is an immutable object?
What are the types of collections in java?
