What is spring bean life cycle?

265

What is the use of @required annotation?

240

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)

1687

What is primitive data type in java?

721

Difference between final and effectively final ?

820

What do you mean by checked exceptions?

740

Which is the default scope of bean in spring? In addition, are they synchronized?

241

What are the Packages of websphere?

680

Write a program to bind string values in a preparedstatement?

731

What is front controller in struts2?

746

Why do we need jdbc api?

680

Why char array is favored over string for the storage of passwords?

761

What’s the difference between struts and turbine? What’s the difference between struts and espresso?

729

What is the difference between session.save() and session.persist() method?

295

what is mena by object block any what is the use of that

1972