Remove Exception in Overridden Method in Java

While a superclass method throws an exception while overriding it you need to follow the certain rules.

• The sub class method Should throw Same exception or, sub type −
• It should not throw an exception of super type −
• You may leave the method in sub class Without throwing any exception

According to the 3rd rule, if the super-class method throws certain exception, you can override it without throwing any exception.

Example

In the following example the sampleMethod() method of the super-class throws FileNotFoundException exception and, the sampleMethod() method does not throw any exception at all. Still this program gets compiled and executed without any errors.

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Scanner;
abstract class Super{
   public void sampleMethod()throws FileNotFoundException{
      System.out.println("Method of superclass");
   }
}
public class ExceptionsExample extends Super{
   public void sampleMethod() {
      System.out.println("Method of Subclass");
   }
   public static void main(String args[]) {
      ExceptionsExample obj = new ExceptionsExample();
      obj.sampleMethod();
   }
}

Output

Method of Subclass