Answer Posted / shashi

Yes, Is it possible to do method overloading and overriding at a
time

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class A
{
void Add(int x, int y)
{
System.out.println("Hello From Class A" + (x+y));

}
}
class B extends A
{
void Add(int x, int y)
{
System.out.println("Hello From Class B" + (x+y));

}
void Add(double x, double y)
{
System.out.println("Hello From Class B" + (x+y));

}

}
class Test
{
public static void main(String ar[])
{
B acv = new B();
acv.Add(100.0,20.0);
acv.Add(10,20);
}
}

What is the definition of tree ?

967

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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)

1878

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What is difference between pointer and reference?

999

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Does substring start with 0?

937

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Why array is used in java?

912

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What is data object example?

940

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What is jvm? Why is java called the platform independent programming language?

950

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Which is easier netbeans or eclipse?

1013

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What is the main function in java?

1008

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What is a instance variable?

1014

---

Does java support Operator Overloading?

990

---

What is main method?

997

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In the below example, how many string objects are created?

980

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What are static methods?

992

---

What is the difference between static binding and dynamic binding?

1048

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