通過反射得到得到了 TalkingClock類中是有個靜態方法，并且返回值是私有域的beep。在核心技術卷一中說到有方法可以借助這個方法得到私有域，求解？附上類的代碼public?class?TalkingClock?{ ????private?int?interval; ????private?boolean?beep; ????/** ?????*?Constructs?a?talking?clock ?????*?@param?interval?the?interval?between?messages?(in?milliseconds) ?????*?@param?beep?true?if?te?clock?should?beep ?????*/ ????public?TalkingClock(int?interval,boolean?beep){ ????????this.interval?=?interval; ????????this.beep?=?beep; ????} ????/** ?????*?Stars?the?clock ?????*/ ????public?void?start(){ ????????ActionListener?listener?=?this.new?TimePrinter(); ????????Timer?t?=?new?Timer(interval,listener); ????????t.start(); ????} ????public?class?TimePrinter?implements?ActionListener{???//?TimerPrinter?is?an?InnerClass ????????@Override ????????public?void?actionPerformed(ActionEvent?e)?{ ????????????Date?now?=?new?Date(); ????????????System.out.println("At?the?tone?,?the?time?is?"+?now); ????????????if(TalkingClock.this.beep)?Toolkit.getDefaultToolkit().beep(); ????????} ????} }