請問ｊａｖａ　String　點轉做ｏｂｊｅｃｔ

first of all:

str = "ABC"; instead of str = ABC;
double quote is used to declear string.

String to Object:
item = str;

Object to String:
item.toString();

sorry呀，唔係好明你問乜野，你係咪指點樣響item入面access到str呀？定係點樣將str convert做object type？定係有其他意思？唔係好明你既 "拎到"係咩意思喎，定係你想講 "link到"？

如果你只係想將個 item變做str，你只要up cast object就得架啦，如：

Object item;
String str = " ABC ";
item = (Object) str; // <= 咁樣就可以up cast String type做Object type架啦

我諗你需要知道既係響Java入面，所有non-Primitive types都係object既subclass黎架，所以簡單黎講如果個type唔係byte, short int, long, float, double boolean, char既話，你都可以用up cast既方法變做object架

如果有咩唔明，歡迎再問