What does the Spark Engine do?

210

8. What is the difference between: a. Direct Costing Method and Absorption Method. b. Fixed Cost and Variable Cost.

1377

Why do we use iterators?

607

How to use mysqldump to create a copy of the database?

495

Explain the asp.net session state modes.

600

What is meant by structural programming?

533

does any one know where we can purchase insulation oil for high voltage oil filled cables

1841

How to calculate the size of earth cable to earth the neutral of UPS ?

1398

What are the steps of software development life cycle (SDLC) and software life cycle(SLC)? Also the difference between SDLC and SLC?

2319

What is factor variable in r language?

54

What about javascript? : java security

513

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)

1443

why electronic instruments is more favorable than electrical?

1520

What is a unique constraint?

598

If we have the center line of the Finnish road level and we want to know what level of pay would have offset the Lhs and Rhus RHS 1,2.5,5 1,2.5,5 m.

1530