throwing Exception

[Sweta Pillai]

class A {A() throws Exception {}} // 1
class B extends A {B() throws FileNotFoundException {}} // 2

Why I am not able to throw FileNOtFoundException. As I suppose we cannot
throw More exceptions but less is acceptable.

[Manfred Klug]

Originally posted by Sweta Pillai:

class A {A() throws Exception {}} // 1
class B extends A {B() throws FileNotFoundException {}} // 2

Why I am not able to throw FileNOtFoundException. As I suppose we cannot
throw More exceptions but less is acceptable.

Since the compiler automatically adds the call to the parent constructor. This is the code after compilation:

import java.io.FileNotFoundException;
 
class A {
    A() throws Exception {
        super(); // Object constructor
    }
}
class B extends A {
    B() throws FileNotFoundException {
        super(); // A constructor
    }
}

[Chandra Bhatt]

class A {A() throws Exception {}} // 1
class B extends A {B() throws FileNotFoundException {}} // 2

Both FileNotFoundException and Exception are checked exceptions.
While the parent class constructor throws the more specific checked
exception, child class must handle or throw that exception or super class
of that.

If you do like:

class A {
    A()throws FileNotFoundException{}
}
class B extends A {
    B() throws Exception,NullPointerException,ArrayIndexOutOfBoundsException {
    }
}

It is alright!


Welcome to Ranch Sweta!

Thanks,

[Sweta Pillai]

Thanks buddy !