Exception doubt

[Srinivas Kumar]

public class AQuestion
{
public static void main(String args[])
{
System.out.println("Before Try");
try
{
}
catch(java.io.IOException t)
{
System.out.println("Inside Catch");
}
System.out.println("At the End");
}
}
1.Compiler error complaining about the catch block where no IOException object can ever be thrown.
2.Compiler error - IOException not found. It must be imported in the first line of the code.
3.No compiler error. The lines "Before Try" and "At the end" are printed on the screen.

Answer is given as 1.
If the body of try block does not contain any code, can't we catch any exception?

[Keith Lynn]

How would you cause an exception to be thrown if there isn't any code?

[Srinivas Kumar]

If I replace IOexception with Throwable, the code does not give any compilation error.howz that possible?

Here is the code.

public class AQuestion
{
public static void main(String args[])
{
System.out.println("Before Try");
try
{
}
catch(Throwable t)
{
System.out.println("Inside Catch");
}
System.out.println("At the End");
}
}

[Keith Lynn]

Because all unchecked exceptions are subclasses of Throwable.

[Antonio Trapero]

If you dont throw any exception inside try/catch body , nor a call to a method that throws the exception, you have a compilation error. If you catch Throwable or error, it let you compile, cause errors could happen any time in runtime (you dont declare it).