Exception vs IOException

[Sanjeev Singh]

While writing some codes I obseved that

[B]Program#1[/B]
import java.io.IOException;
public class TestException {
    public void doNothing(){
        try{
            
        }catch(Exception e){
            
        }
    }
}

compiles fine while

[B]Program#2[/B]
import java.io.IOException;
public class TestException {
    public void doNothing(){
        try{
            
        }catch(IOException e){
            
        }
    }
}

gives
C:\nbworkspace\FlowControl\src\TestException.java:6: exception java.io.IOException is never thrown in body of corresponding try statement
}catch(IOException e){
1 error
BUILD FAILED (total time: 0 seconds)
I was under a impression that the Program#1 should also fail.Can anyone make it out why the Program#1 compiles.

[Priya Viswam]

Summary for try-catch without throwing exception:

�Catching Throwable, Error (including its subclasses), Exception, and RuntimeException (including its subclasses) always compile.
�Catching directly subclasses of Throwable except for Exception and Error will generate a compile time error.
�Catching subclasses of Exception except for RuntimeException will generate a compile time error.

[Sanjeev Singh]

Priya,Thanks for clarifying.

[Ramya Chowdary]

not throwing a checked Exception in a declared Try block is compiler error.