Enthuware

Hi admin. Could you please explain, why ExceptionInInitializerError is not thrown in the forth point?

ExceptionInInitializerError can be thrown when the code is run. But before you can run the code, it has to be compiled. Option 4 fails during compilation, which means, you can't run it. So, an ExceptionInInitializerError will not be thrown.

Hi, just incase there's anyone wondering:
Compiling the fourth points results in the following compile time error:

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X.java:16: error: initializer must be able to complete normally
static {
^
1 error
------------------------------

Java essentially sees that the static block will never complete and flags the error.

If we modify the code a little and trick the compiler into thinking that the block might execute normally, in that case we can get the ExceptionInInitializerError:

-------------------------------
public class X {
static {
if (true) // Compiler thinks this may or may not be true.
throw new NullPointerException(); // This is okay!
}

public static void main(String[] args) {

}
}
-------------------------------