1).what is the difference between below examples
String s="vijay";
String s=new String("vijay");
- 12 Answers
- 17591 Views
- Mascon, Satyam, TCS, I also Faced
- E-Mail Answers
Answer Posted / ravikiran
first one will create an object on the heap
second one will create two objects one will saved on the
heap and another will get saved on the string pool
| Is This Answer Correct ? | 0 Yes | 6 No |
Post New Answer View All Answers
Can we make constructors static?
How many types of gc are there in java?
What is the basic concept of java?
What does int [] mean in java?
What is a "pure virtual" member function?
What is nested loop? What is dangling else condition in it?
Explain the importance of finalize() method.
What are the two ways to create a thread?
Name four container classes.
What if static is removed from main method?
How to read and write image from a file ?
How does a for loop work?
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)
What is off heap memory?
Can we write multiple catch blocks under single try block?
