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What do you understand by java virtual machine?


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More Core Java Interview Questions

Can a class be private?

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wat is final...? wat is finally...? wat is finalize....? difference between " final and finally and finalize "...?

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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)

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What does the exclamation mark mean in java?

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What are the OOAD concepts in java explain with examples?

4 Answers   Aricent, CTS,






Difference between a Canvas and a Scroll Pane?.

1 Answers   NIIT,


can abstract class have constructor how can you achive this ?

4 Answers   Fidelity,


what is mutual exclusion? How can you take care of mutual exclusion using java threads? : Java thread

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How do you sort in descending order in java using collections sort?

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if a java file without any source code is valid java file?

3 Answers   SparkTG,


What do you mean by composition in java?

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What is thread pool? How can we create thread pool in java?

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