Answer / tamilvanan

overloading:
method overloading means method name is same and different
parameter ie different signature.. and overloading method
are present in same class
for eg ,
let us consider show() is a method
1.show(int a)
2.show(int a,int b)
overriding:
method overriding means method name is same and
parameter also same. these are present in different levels
of class
for eg,
let us consider show() is a method
1.show(int a)
2.show(int a)

Answer / dipesh

Overloading-->method with different signature
Overriding -->method with same signature

Answer / rana.ankur

overloading:
class A
{
Num(int a)
{
System.out.println("a: " + a);

}
Num(int a,int b)//overloading
{
System.out.println("a and b: " + a + " " + b);

}
CLass Overloading
{
public satic void main(Stinr ar[])
}
A a=new A()
a.Num(12);
a.Num(12,12);
}
}//thanks

Answer / sirisha

overridding:
same method name and same signature.
import java.io.*;
class sum
{
int a=10,b=15;
void sum()
{
int sum=a+b;
System.out.println("sum is:"+sum);
}
}
class sum1 extends sum
{
int c=20;
void sum()
{
int sum1=a+b+c;
System.out.println("sum1 is:"+sum1);
}
}
class override{
public static void main(String[] arg){
sum s=new sum();
s.sum();
sum1 s1=new sum1();
s1.sum();
}
}

over loading:
method name same but different signature.
class sum{
void add(int a,int b){
}
class sum{
void add(string s1,string s2){
}

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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