Interested to Buy Any Domain ? << Click Here >> for more details...
what is difference between class and object?
- 43 Answers
- 90396 Views
- College School Exams Tests, HCL, I also Faced
- E-Mail Answers
Answer Posted / deepak
class is a collection of its instance members like
variables and method. Objects are declared in the class.
Objects are nothing but a entity which keeps the refrence.
| Is This Answer Correct ? | 7 Yes | 2 No |
Post New Answer View All Answers
what is meant by abstract class?
what is the volatile modifier for? : Java thread
What is method overloading with type promotion?
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)
What is the difference between an argument and a parameter?
How many unicode characters are there?
What is a numeric literal?
what happens when a thread cannot acquire a lock on an object? : Java thread
How do you read a char in java?
What is string args [] in java?
What is constructor in java ?
What are the application of stack?
What is class level lock ?
What does t in java mean?
What is difference between array and arraylist in java?
