A DESCRIPTION OF THE PROBLEM :
The example given in the getModifiersEx() method contains an error:

int onmask = SHIFT_DOWN_MASK | BUTTON1_DOWN_MASK;
    int offmask = CTRL_DOWN_MASK;
    if (event.getModifiersEx() & (onmask | offmask) == onmask) {
        ...
    }

The error (in Eclipe): "The operator & is undefined for the argument type(s) int, boolean."

There are () missing. Also in the Java 2 Platform Edition 5.0.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -

int onmask = SHIFT_DOWN_MASK | BUTTON1_DOWN_MASK;
    int offmask = CTRL_DOWN_MASK;
    if ((event.getModifiersEx() & (onmask | offmask)) == onmask) {
        ...
    }
ACTUAL -

int onmask = SHIFT_DOWN_MASK | BUTTON1_DOWN_MASK;
    int offmask = CTRL_DOWN_MASK;
    if (event.getModifiersEx() & (onmask | offmask) == onmask) {
        ...
    }

URL OF FAULTY DOCUMENTATION :
http://java.sun.com/j2se/1.4.2/docs/api/java/awt/event/InputEvent.html#getModifiersEx()