What is inner class?what is the use of inner class?where we
create the object for inner class? and inner class can
extend any class or inner class can implement any interface?
56
how to one war file class to another war file class?
153
What is Session reduplication and how its done?
70
What are the restrictions imposed by a Security Manager on
Applets?.
172
We are seeing so many videos/audios as many web sited. But
question is these videos or audios are stored in Databases (
Oracle, Mysql, Sybase,... ) or stored any file directory
from there they will give the link for that? Pls explain and
give sample code to achieve this one? Thanks, Seenu.
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)
21
Tell me the Importent classes in net package?
139
Is it safe for adding 10,00,000 records/objects to
HashMap?, i.e is it safe to add millions of objects to
HashMap?
107
What are listeners in java and explain ?
193
what is dafault constructor and paramererised constructor
with example?
116
Can we call virtual funciton in a constructor ?
119
Difference between flush() and commit() in hibernate?
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