Answer / shweta sharma

AppletStub is the java.applet interface . This interface is
used to implement an applet viewer. It is not normally used
by applet programmers.

What is the implementation of destroy method in java. Is it native or java code?

0 Answers  

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Java run-time system generates What class of exceptions?

2 Answers   TCS,

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what release of java technology are currently available what do they contain?

1 Answers  

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This abstract class is correct ? abstract class A { public abstract void Disp(); public abstract void B() { } public absract virtual C() { } }

0 Answers   HCL,

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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)

0 Answers  

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what is the main difference between string and stringbuffer? can you explain it with program?

2 Answers  

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What do you understand by synchronization?

0 Answers  

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What are the traverses in Binary Tree?

2 Answers   Adobe, Infosys,

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What is a conditional equation?

0 Answers  

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What are different types of arrays?

0 Answers  

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how a marker interface gets its functionality and when we implements a marker interface how it got invoked

3 Answers   Mind Tree,

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What is basic syntax?

0 Answers  

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