it is created when the first finalizable object is garbage collected 在對(duì)第一個(gè)可終結(jié)對(duì)象進(jìn)行垃圾回收時(shí)創(chuàng)建該線程。
and finalization adds overhead to instantiation and garbage collection of finalizable objects 并且終結(jié)還為可終結(jié)對(duì)象的實(shí)例化和垃圾收集帶來(lái)了開(kāi)銷。
objects during shutdown only while the number of finalizable objects continues to decrease 在關(guān)閉過(guò)程中,只有當(dāng)可終結(jié)對(duì)象的數(shù)目繼續(xù)減少時(shí),運(yùn)行時(shí)才繼續(xù)