問題：?Baozipu類和Chihuo類都創建了Baozi的對象為什么main方法還要傳個Baozi的對象參數進去呢？這里有點不解?難道是因為鎖？ package?cn.XianCheng; public?class?Baozipu?extends?Thread{ ????//創建一個包子類型的變量 ????????Baozi?bz?=?new?Baozi(); ????//使用帶參構造方法為這個包子賦值 ????public?Baozipu(Baozi?cz){ ????????this.bz?=?cz?; ????} ????//設置線程任務生產包子 ????@Override ????public?void?run()?{ ????????????while(true){ ????//必須使用同步技術保證只有一個線程在執行??這里用?同步代碼塊 ????????synchronized(bz){ ????????//判斷有沒有包子 ????????????if(bz.flag==true){ ?????????????//有包子包子鋪就進入等待狀態 ????????????????bz.notify(); ????????????????try?{ ????????????????????bz.wait(); ????????????????}?catch?(InterruptedException?e)?{ ????????????????????e.printStackTrace(); ????????????????} ????????????} ????????????if(bz.flag==false){ ????????????//沒有包子就生產包子 ???????????????bz.pi?=?"薄皮"; ???????????????bz.xian?=?"牛肉餡"; ????????????????System.out.println("正在生產包子"+Thread.currentThread().getName()); ????????????????try?{ ????????????????????Thread.sleep(1000); ????????????????}?catch?(InterruptedException?e)?{ ????????????????????e.printStackTrace(); ????????????????} ????????????????bz.flag?=?true; ????????????????System.out.println("包子鋪已經生產好了："+bz.pi+bz.xian+"包子"+Thread.currentThread().getName()); ????????????????bz.notify(); ????????????????try?{ ????????????????????Thread.sleep(1000); ????????????????}?catch?(InterruptedException?e)?{ ????????????????????e.printStackTrace(); ????????????????} ????????????} ????????} ???????} ????} }-------------------------------------------------------------------------------------------------------------package?cn.XianCheng; public?class?Chihuo?extends?Thread{ ????????Baozi?bz?=?new?Baozi(); ????????public?Chihuo(Baozi?cz){ ????????????this.bz?=?cz?; ????????} ????@Override ????public?void?run()?{ ????????while(true){ ????????????synchronized?(bz){ ????????????????if(bz.flag?==?false){ ????????????????????bz.notify(); ????????????????????try?{ ????????????????????????bz.wait(); ????????????????????}?catch?(InterruptedException?e)?{ ????????????????????????e.printStackTrace(); ????????????????????} ????????????????} ????????????????if(bz.flag?==?true){ ????????????????????System.out.println("正在吃："+bz.pi+bz.xian+"包子"+Thread.currentThread().getName()); ????????????????????try?{ ????????????????????????Thread.sleep(1000); ????????????????????}?catch?(InterruptedException?e)?{ ????????????????????????e.printStackTrace(); ????????????????????} ????????????????????bz.flag?=?false?; ????????????????????System.out.println("吃完了"+Thread.currentThread().getName()); ????????????????????System.out.println("-------------------------------------"); ????????????????????bz.notify(); ????????????????????try?{ ????????????????????????Thread.sleep(1000); ????????????????????}?catch?(InterruptedException?e)?{ ????????????????????????e.printStackTrace(); ????????????????????} ????????????????} ????????????} ????????} ????} }--------------------------------------------------------------------------------------------------package?cn.XianCheng; public?class?Baozi?{ ????//皮 ????//餡 ????//包子的狀態 ?????String?pi; ?????String?xian; ?????boolean?flag?=?false; }--------------------------------------------------------------------------------------------------package?cn.XianCheng; public?class?XianChengmain?{ ???? ????public?static?void?main(String[]?args)?{ ????????????Baozi?cz?=?new?Baozi();//創建包子對象 ????????????new?Baozipu(cz).start();//開啟包子鋪線程 ????????????new?Chihuo(cz).start();//開啟吃貨線程 ????} }