private void init() {
        // defaults for interface with page author
        begin_ = null;          // (no expression)
        end_ = null;            // (no expression)
        step_ = null;           // (no expression)
        items_ = null;        // (no expression)
        delims_ = null;        // (no expression)
    }
private void init ( ) { begin_ = null ; end_ = null ; step_ = null ; items_ = null ; delims_ = null ; }
(re)initializes state (during release() or construction)