explain System.out.println

Answer Posted / mallikarjuna g

System : It is a standard java class. It comes from the
java.lang package. it is bydefault package.
Out : The class system contains static field named "out".
so System.out referes to the value stored in that static
filed. the value System.out is an object of the class
printStream from the standard java package java.io.
Println() : it is the instance method come from the
PrintStream class.

so System.out.println() calls the "Println()" method
associated with the "printStream" object referred to by
static field "out"

Is This Answer Correct ?    55 Yes 12 No



Post New Answer       View All Answers


Please Help Members By Posting Answers For Below Questions

How do I print a “?

554


How java enabled high performance?

562


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)

1435


Explain about object oriented programming and its features?

569


Is empty in java?

559






What is the statements?

561


What is the difference between multiple processes and multiple threads?

548


What will happen if there is a default method conflict as mentioned above and we have specified the same signature method in the base class instead of overriding in the existing class ?

492


What is the size of a string in java?

520


What is widening and narrowing in java? Discuss with an example.

536


What are the escape sequences in java?

541


What is the purpose of the strictfp keyword?

592


What is a ternary operator in java?

510


What is java string pool?

519


What is difference between final and immutable?

533