CODEWITHSUNDEEP
java
user3024035
user3024035

Reputation: 23

Program not compiling

I am reading about inheritance and exceptions. When I try to compile the below code in console, I am getting compiler error. Still I couldn't figure out why. But if I change the method name in my class B, everything works fine. Please help.

Here is my code:

import java.io.IOException;

class A {  

    public void print() throws IOException {
        System.out.println("In Class A.");
        throw new IOException("Printed in A.");
    }

}

class B extends A {

    public void print() throws Exception {
        System.out.println("In Class B.");
        throw new Exception("Printed in B.");
    }

}

public class TestPrint {

    public static void main (String args[]) {
        B b = new B();
        try {
            b.print();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}

Upvotes: 2

Views: 68

Answers (2)

ap91
ap91

Reputation: 78

You can't throw higher exception in inheritance hierarchy in overridden method, That is IOException is subclass of Exception Class.

You can throw any exception that is subclass of IOException in overridden method

Upvotes: 1

Gokul Nath KP
Gokul Nath KP

Reputation: 15553

An overridden method can not throw Checked Exception which is higher in hierarchy than original method.

Exception is super class of IOException.

So your print() method sub class (B) can throw either IOException or any of the sub classes of IOException.

Change your class B, as shown below:

class B extends A {

    public void print() throws IOException {
        System.out.println("In Class B.");
        throw new IOException("Printed in B.");
    }

}

Upvotes: 4

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