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from abhilash - constructors

 
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Read the following piece of code carefully.
import java.io.IOException;

public class Question72
{
public Question72() throws IOException
{
throw new IOException();
}
}
Assume that the defination of Question72E begins with the line
public class Question72E extends Question72
It is required that none of the constructors of Question72E should throw any checked exception.

1.It can be achived by placing the call to the superclass with a super keyword , which is placed in a try block with a
catch block to handle the IOException thrown by the super class.
2.It can be achived by avoiding explicit calls to the base class constructor.
3.It cannot be done in the Java Language with the above definition of the base class.
// i want to ask why 1 isn't correct?
 
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super is to be the first line and compiler will object if u write try before super call
now if we dont call super explicitly and provide a try catch block still super is executed before any code is executed in the constructor and even if u write the try catch block super will be called before that.
Cherry
 
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The answer would be
3.It cannot be done in the Java Language with the above definition of the base class.

super or this has the be the first statement of the constructor. If not an implicit call (super())is inserted by the compiler before the first statement. This makes catching checked exceptions thrown by the super class constructor impossible in the derived class constructor.
-
Siva
 
Anshuman Acharya
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got it! just slipped out of my mind... thanx!
 
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