What is full form of j2ee?

713

Is singleton set an interval?

721

Difference between multicast and unicast?

727

What is meant by singleton class?

791

Why is spring boot used? : Spring Boot

270

What is data source in java?

707

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)

1696

What is the use of string and stringbuffer?

757

difference between mca and mqi channels?

902

What is application properties file in spring boot? : Spring Boot

295

What is persistence object hibernate?

235

Why are swing components called lightweight?

728

What is the purpose of @keyproperty annotation annotation?

751

Which of the attributes in the monitoring tab for a jdbc connection pool in the administrative console tell us how many clients are currently waiting for a connection? : BEA Weblogic

705

Why we are using jpa annotation instead of hibernate?

230