question: public final String toString ( int depth ) { if ( depth <= 0 ) return "" ; return ( "\n*DecimalNode" + super . toString ( depth ) + "Mantissa: " + mantissa + "; exponent: " + exponent + "; big value: " + ( bigVal != null ? bigVal . toString ( ) : "<null>" ) + "\n; image = " + image ) ; }
target:  Displays this node as a String, implementing ExploreNode interface; depth parameter is a bound on the depth of the portion of the tree that is displayed.