單項(xiàng)選擇題

在public HttpSession getSession(boolean bool)的方法定義中,當(dāng)bool為false時(shí)表明()

A.直接返回會(huì)話對(duì)象
B.當(dāng)服務(wù)器已經(jīng)創(chuàng)建了會(huì)話對(duì)象就返回該對(duì)象,否則返回null
C.直接返回null
D.當(dāng)服務(wù)器已經(jīng)創(chuàng)建了會(huì)話對(duì)象就返回該對(duì)象,否則新建一個(gè)會(huì)話對(duì)象并返回

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