Answer Posted / ravindra reddy

The size of the arraylist will increase to 150 why because
in arraylist the elements are reach to initial size of the
array list then size will be increase to half of the
capacity

What programs use java?

1030

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What does indexof mean?

1102

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What is main function purpose?

1079

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What is the purpose of skeleton and stub?

1349

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Can we use catch statement for checked exceptions when there is no chance of raising exception in our code?

1071

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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)

1988

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What is finalize() function in java?

1065

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How does arrays sort work in java?

1052

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What is unicode with example?

1304

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Explain differences between checked and unchecked exceptions in java?

1113

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What is dynamic array in java?

1077

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Can we overload the methods by making them static?

1045

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Can we create a class inside a class in java?

1148

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What is finally and finalize in java?

1156

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How does indexof work?

1011

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