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Can Applet have constructors?
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Answer / rohit chhabra
usualy applets hv no contructors coz we do't need to create
object of the applet class...
but if one wants to create an object of an applet class,
create it in static block...This block execute before init
method..
| Is This Answer Correct ? | 45 Yes | 4 No |
Answer / sunil dhadwe
In Java, every class has constructor, so Applet class also has constructor which is invoked when Applet object is created by browser or Applet Viewer. Usually we don't need constructor as we don't create Applet object.
To write applet we write our own class that extends Applet, so our class also becomes Applet. Our class can also have constructor. From our class we can call super class (Applet) constructor. Look at following code:
import java.applet.Applet;
import java.awt.Graphics;
/*
<applet code="AppletConst" width=400 height=300>
</applet>
*/
public class AppletConst extends Applet {
public AppletConst() {
super(); // no compilation error : means Applet class has constructor
System.out.println("Applet constructor");
}
public void paint(Graphics g) {
g.drawString("Hello world!", 50, 25);
}
}
| Is This Answer Correct ? | 39 Yes | 3 No |
Answer / urusa
Applets do not have constructors because we don't need to create the object of the applet class....so its justified that it is true that applets usually do not have constructors
| Is This Answer Correct ? | 12 Yes | 3 No |
Answer / roy antony arnold
Don't say like this....
Answer:
Applets don't usually have constructors because an applet
isn't guaranteed to have a full environment until its
init() method is called. For example, the Applet image
loading methods don't work inside an applet constructor, but
can be called from the init() method.
| Is This Answer Correct ? | 12 Yes | 8 No |
Answer / therathna
In Java For Every Class we can provide constructors so
o busily we can provide constructors for applets.
u Don't ask like this type of questions because we can
pratically found these questions when done programs
u ask only questions like which are not practically unable
to do
| Is This Answer Correct ? | 5 Yes | 23 No |
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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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