while overriding, methos in subclass can not throw any new checked exception. it can only decalre exception already declared in the super class or its subclasses.

since Airthmetic exception is an unchecked exception it can be declared without any error.

program will work fine Example:-

/*
 * OverSuper.java
 *
 *Created on May 22, 2006, 12:11 PM
 *Concept: overriden method can throw diffrent exceptions
 *its method will be overriden in Overriding.
 */

package concepts;
import java.io.*;
/**
 *
 * @author Abdul
 */
public class OverSuper {
   
    protected void myFunction() throws IOException{
   
 System.out.println("Method in super class throwing IOExcption");
    }
   
}

####################################################

/*
 * Overriding.java
 *
 * Created on May 22, 2006, 12:10 PM
 *
 * this class overrides a method of super class and try to throw differnt type of excption
 *
 */

package concepts;
import java.io.*;
/**
 *
 * @author Abdul
 */
public class Overriding extends OverSuper{
   
  
    public Overriding() {
    }
   
    protected void myFunction() throws ArithmeticException{
   
 System.out.println("this is ovverriden in sub class throws arithmetic exception");
    }
    public static void main(String[] arg){
   
 Overriding ov=new Overriding();
 ov.myFunction();
    }
}