How can we get one Interface methods whit out using
implementation of interface
Answer Posted / hanuma
Use the composition
Is This Answer Correct ? | 0 Yes | 0 No |
Post New Answer View All Answers
How do you add an arraylist to an array in java?
Can we increase array size dynamically in java?
What does exp mean in math?
How we can declare a static variable?
What is a buffer in java?
What is the difference between overriding and overloading in OOPS.
What is basic syntax?
What is passing parameters in java?
What do you understand by garbage collection in Java? Can it be forced to run?
Can memory leak happen java?
What is computer compiler?
What is the difference between access specifiers and access modifiers in java?
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)
When will you define a method as static in Java?
What is meant by method?