It is a relatively common and convenient practice to
include/exclude bits of code at compile-time with a
boolean constant, like one might do with #ifdef in C.
Example:

    if(EXTREME_DEBUG) {
        LOG.debug("password = " + passwd);
    }

where EXTREME_DEBUG is defined as

    private static final boolean EXTREME_DEBUG = false;

More complex expressions might be used in the conditional
that still evaluate to false at compile-time.

It would be nice if the editor's syntax highlighting
could detect such code segments and "lowlight" them by
graying them out, similar to comments (but a separate
color of course), when the constant is set to false.
When it is true, they would be displayed as normal code.