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abstract class Demo {
public void show()
{
System.out.println("Hello I am In show method of Abstract
class");
}
}
class Sample extends Demo
{
public void show()
{ super.show();
System.out.println("Hello I am In Sample ");
}
}
public class Test
{
public static void main(String[] args) {
//I WANT TO CALL THE METHOD OF BASE CLASS IT IS POSSIBLE OR NOT
CAN WE USE SCOPE RESOLUTION OPERATOR TO CALL OR JAVA NOT
SUPPORTED THAT :: OPERATORE
}
}
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Answer / kuldeep
public class Test extends Demo {
public static void main(String[] args) {
Demo obj=new newQuestion();
obj.show();
}
//use this code in the main it will call the base method
| Is This Answer Correct ? | 5 Yes | 2 No |
Answer / sathiya
We cant call the base class since we cant create object for
abstract class(base class is a abstract class).
And java does not support the scope resoultion operator to
call a class.
| Is This Answer Correct ? | 2 Yes | 0 No |
Answer / kapilpahujamca
I TELL THEM IT IS NOT POSSIBLE TO CALL THE BASE METHOD AND I
ALSO REPLY THAT JAVA DOES NOT SUPPORT :: OPEARTOR IT IS
IMMPOSSIBLE
| Is This Answer Correct ? | 1 Yes | 1 No |
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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