can we create instance for interface in java?
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Answer / jyotisubhra ghosh
You can not instantiate an interface,however, u can create
its reference variabe.
You can just assign an object of a class (implementing the
interface) to the reference variable of the interface.
| Is This Answer Correct ? | 50 Yes | 1 No |
Answer / guru
interface call2
{
void get1();
int a=8;
}
interface call extends call2
{
void get();
}
class interex implements call,call2
{
public void get()
{
System.out.println("hi");
}
public void get1()
{System.out.println("hsfwsi");}
}
class interex1
{
public static void main(String s[])
{
call e=new interex1();
e.get();
e.get1();
System.out.println(e.a);
}
}
second pgm
-----------
interface call2
{
void get1();
int a=8;
}
interface call extends call2
{
void get();
}
class interex implements call,call2
{
public void get()
{
System.out.println("hi");
}
public void get1()
{System.out.println("hsfwsi");}
}
class interex1
{
public static void main(String s[])
{
call e=new interex();
e.get();
e.get1();
System.out.println(e.a);
}
}
| Is This Answer Correct ? | 14 Yes | 7 No |
Answer / venkateswararao
No,we cant create an instance if an interface in java , but
we can create a reference of an interface and we can
assign the object of a class to that interface reference.
| Is This Answer Correct ? | 6 Yes | 0 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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