question: public String toString ( ) { if ( val == null ) return "null" ; if ( val instanceof Long || val instanceof Integer ) { return Long . toString ( val . longValue ( ) ) ; } double d = val . doubleValue ( ) ; if ( Double . isInfinite ( d ) ) return ( d > 0 ) ? "(1.0 / 0.0)" : "(-1.0 / 0.0)" ; if ( Double . isNaN ( d ) ) return "(0.0 / 0.0)" ; return Double . toString ( d ) ; }
target:  Returns the string representing the object