Inheritance , method signature , method overriding and throws clause

Question

My Parent class is :

import java.io.IOException;
public class Parent {
        int x = 0;
        public int getX() throws IOException{
        if(x         


        

Answer 1

You have the freedom to override a method without the throws keyword, because if you want to develop a method by controlling all the exceptions, then you can do that by overriding the method without any throws clause.

But remember one thing that if you want to include the throws clause in the subclass method, then the throws clause must associate with the exception which must be the same or the subclass of the exception what is thrown by its superclass method. for example-

class Super{
    void a()throws IOException{
        ......
    }
}
class Sub extends Super{
    void a()throws IOException{
        ......
    }
}

The a() method of class Sub must throw IOException or any subclass of IOException, otherwise compiler will show error.

That means if you write

void a()throws Exception

in the class Sub, then it will cause compilation error.