What is complexity in java?

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When does an object becomes eligible for garbage collection in java?

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How do you allocate memory to object?

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Can we define package statement after import statement in java?

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What are MalformedURLException and UnknownHost Exceptions and whey they will be thrown?

2 Answers  

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what is difference between servletconfig and servletcontext?

3 Answers   Amdocs,

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What is a return in java?

0 Answers  

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what is difference Between Core Java and advance java

60 Answers   HCL, HP, Sambalpur University, TCS, Vensai Technologies, Wipro,

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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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Why object class is super class for every class in java?

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why the wait,notify,notifyall methods are placed in object class?these are the thread concepts why these methods are placed in Object class?

2 Answers   Global Logic, Satyam,

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What is an example of a boolean?

0 Answers  

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